Abstract: Sequential flowering of sympatric plant species is a commonly observed phenomenon and is thought to contribute towards maintaining the pollinator community. Sequential flowering is also interpreted as a potential way to reduce competition for pollinators and to reduce interspecific pollen transport. Within-season sequential flowering is well-known for many species assemblages and usually shows a staggering over weeks and months. Here, we report on the flowering behaviour of two unrelated sympatric cacti (both Cactaceae — Cactoideae) from N Argentina, Acanthocalycium thionanthum (Cereeae — Trichocereinae) and Parodia microsperma (Notocacteae). At the start of the flowering season, the two taxa exhibit a temporally stable sequential mass-flowering that is triggered by the first rainfall event after the dry season: On the 6th or 7th day after the rainfall, Parodia microsperma starts a 3-day “big-bang” flowering period, and on the 8th or 9th day after the rainfall, Acanthocalycium thionanthum also starts a 3-day “big-bang” flowering period, with 1 day of overlap with that of Parodia. The sequence and duration, including the 1-day overlap, has been found to be temporally stable in all study years, with c. 90% of all flowers buds of a population opening synchronously in years with average spring rainfall. Later in the season, after the fruits derived from these initial flowerings have ripened, opportunistic flowering (including sporadic local small-scale mass flowerings) is exhibited by both species with no apparent synchronization or sequence. Only once was a second “big bang” flowering observed, likely caused by above-average dry conditions. The species pair is notable for the massive “big-bang” flowering triggered by rainfall with a tightly staggered synchronization, as well as for the change in flowering strategy later in the season.
{"title":"Flowering Phenology and Observations on the Pollination Biology of South American Cacti. 3. Temporally Robust Sequential “Big Bang” Flowering of Two Unrelated Sympatric Globular Cacti in Northern Argentina","authors":"U. Eggli, Mario Giorgetta","doi":"10.2985/026.023.0113","DOIUrl":"https://doi.org/10.2985/026.023.0113","url":null,"abstract":"Abstract: \u0000 Sequential flowering of sympatric plant species is a commonly observed phenomenon and is thought to contribute towards maintaining the pollinator community. Sequential flowering is also interpreted as a potential way to reduce competition for pollinators and to reduce interspecific pollen transport. Within-season sequential flowering is well-known for many species assemblages and usually shows a staggering over weeks and months. Here, we report on the flowering behaviour of two unrelated sympatric cacti (both Cactaceae — Cactoideae) from N Argentina, Acanthocalycium thionanthum (Cereeae — Trichocereinae) and Parodia microsperma (Notocacteae). At the start of the flowering season, the two taxa exhibit a temporally stable sequential mass-flowering that is triggered by the first rainfall event after the dry season: On the 6th or 7th day after the rainfall, Parodia microsperma starts a 3-day “big-bang” flowering period, and on the 8th or 9th day after the rainfall, Acanthocalycium thionanthum also starts a 3-day “big-bang” flowering period, with 1 day of overlap with that of Parodia. The sequence and duration, including the 1-day overlap, has been found to be temporally stable in all study years, with c. 90% of all flowers buds of a population opening synchronously in years with average spring rainfall. Later in the season, after the fruits derived from these initial flowerings have ripened, opportunistic flowering (including sporadic local small-scale mass flowerings) is exhibited by both species with no apparent synchronization or sequence. Only once was a second “big bang” flowering observed, likely caused by above-average dry conditions. The species pair is notable for the massive “big-bang” flowering triggered by rainfall with a tightly staggered synchronization, as well as for the change in flowering strategy later in the season.","PeriodicalId":50413,"journal":{"name":"Haseltonia","volume":"23 1","pages":"109 - 97"},"PeriodicalIF":1.5,"publicationDate":"2017-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"87301976","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Abstract: Morphological and functional characteristics of flowers have been the primary criterion for traditional plant taxonomy and systematic classification because of their assumed constancy among individuals within a population. The effects of resource competition and pollen limitation from those of inflorescence architecture were separately studied during flowering season of the species to investigate patterns of investment allocation and fruit set among flowers within inflorescences of Sedum praealtum. I found that architecture was primarily accountable for the variation observed in reproductive traits of flowers within inflorescences. Specifically, the S. praealtum inflorescences exhibit a proximal to distal investment allocation sequence from female-biased to male-biased flowers, whereas the observed differences in fruit set were at least partially attributable to pollen limitation in distal-positioned flowers. Given the opportunity for different contributions of female and male functions to reproductive success, potential gender specialization of flowers at different positions within the inflorescence are discussed.
{"title":"Architectural Effects on Floral Traits in Sedum praealtum Dc. (Crassulaceae) in Mexico","authors":"A. Hernández-Ramírez","doi":"10.2985/026.023.0105","DOIUrl":"https://doi.org/10.2985/026.023.0105","url":null,"abstract":"Abstract: \u0000 Morphological and functional characteristics of flowers have been the primary criterion for traditional plant taxonomy and systematic classification because of their assumed constancy among individuals within a population. The effects of resource competition and pollen limitation from those of inflorescence architecture were separately studied during flowering season of the species to investigate patterns of investment allocation and fruit set among flowers within inflorescences of Sedum praealtum. I found that architecture was primarily accountable for the variation observed in reproductive traits of flowers within inflorescences. Specifically, the S. praealtum inflorescences exhibit a proximal to distal investment allocation sequence from female-biased to male-biased flowers, whereas the observed differences in fruit set were at least partially attributable to pollen limitation in distal-positioned flowers. Given the opportunity for different contributions of female and male functions to reproductive success, potential gender specialization of flowers at different positions within the inflorescence are discussed.","PeriodicalId":50413,"journal":{"name":"Haseltonia","volume":"19 1","pages":"35 - 38"},"PeriodicalIF":1.5,"publicationDate":"2017-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"75027199","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Abstract: Astroloba herrei Uitewaal (Asphodelaceae: Alooideae) is currently regarded as one of the rarest and most threatened species in the genus. The species is mostly recorded as having a small, restricted geographical distribution range, as well as a habitat that is vulnerable due, in part at least, to its proximity to human activity. Its distribution range is interpreted as disjunct, as the species is considered to be restricted to two widely separated areas: 1.) the immediate surrounds of Prince Albert in the Great Karoo, Western Cape Province, South Africa, and 2.) a contested spot north of Uniondale in the Little Karoo. We hypothesised that these two areas, separated by 100 km [60 miles], were contiguous, but not through the most frequented routes connecting these two spots. Map overlays for vegetation type, soil type, and geology were used to predict likely habitats in the more inaccessible region through which the areas could be connected, specifically along the northern (Great Karoo) slopes of the Swartberg. Based on the results, the most likely potential localities were identified and visited, and the species was found where predicted. Ground-truthing of the predicted range therefore confirmed that A. herrei is in fact far more widespread than previously believed. Its distribution stretches from west of Prince Albert, along the eastern Swartberg, and across the provincial border into the Eastern Cape Province, where it occurs along the R407 road that connects Prince Albert to Willowmore. At the eastern edge of its range it crosses the Swartberg to the south, and occurs north of Uniondale. Significantly, A. herrei has a natural range which in size by far outstrips that of a number of other Astroloba species. Based on the results of our work we propose that the conservation status of Astroloba herrei be changed from “Vulnerable D2” to “Least Concern”.
{"title":"Extending the Natural Distribution Range of Astroloba herrei Uitewaal (Asphodelaceae: Alooideae): Implications for Its Conservation Status","authors":"S. Molteno, Gideon F. Smith, E. Jaarsveld","doi":"10.2985/026.023.0106","DOIUrl":"https://doi.org/10.2985/026.023.0106","url":null,"abstract":"Abstract: \u0000 Astroloba herrei Uitewaal (Asphodelaceae: Alooideae) is currently regarded as one of the rarest and most threatened species in the genus. The species is mostly recorded as having a small, restricted geographical distribution range, as well as a habitat that is vulnerable due, in part at least, to its proximity to human activity. Its distribution range is interpreted as disjunct, as the species is considered to be restricted to two widely separated areas: 1.) the immediate surrounds of Prince Albert in the Great Karoo, Western Cape Province, South Africa, and 2.) a contested spot north of Uniondale in the Little Karoo. We hypothesised that these two areas, separated by 100 km [60 miles], were contiguous, but not through the most frequented routes connecting these two spots. Map overlays for vegetation type, soil type, and geology were used to predict likely habitats in the more inaccessible region through which the areas could be connected, specifically along the northern (Great Karoo) slopes of the Swartberg. Based on the results, the most likely potential localities were identified and visited, and the species was found where predicted. Ground-truthing of the predicted range therefore confirmed that A. herrei is in fact far more widespread than previously believed. Its distribution stretches from west of Prince Albert, along the eastern Swartberg, and across the provincial border into the Eastern Cape Province, where it occurs along the R407 road that connects Prince Albert to Willowmore. At the eastern edge of its range it crosses the Swartberg to the south, and occurs north of Uniondale. Significantly, A. herrei has a natural range which in size by far outstrips that of a number of other Astroloba species. Based on the results of our work we propose that the conservation status of Astroloba herrei be changed from “Vulnerable D2” to “Least Concern”.","PeriodicalId":50413,"journal":{"name":"Haseltonia","volume":"23 1","pages":"39 - 47"},"PeriodicalIF":1.5,"publicationDate":"2017-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"85444721","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Abstract: Neoraimondia have short-shoots comprised of a large areole with indeterminate growth (‘Kurztriebcephalien’). Flowers of some other cacti are subtended by modestly large photosynthetic leaves. Many specimens of the organ pipe cactus, Stenocereus thurberi, seem to have all these traits: large short-shoots with indeterminate growth and fleshy photosynthetic leaves. Short-shoots in organ pipe cactus grow new photosynthetic leaves at their apical meristem and sometimes flower, branch, and form discrete areoles with new spines. However, unlike short-shoots in Neoraimondia, spherical short-shoots of Stenocereus thurberi seem to retain chlorenchyma and lack extensive cork development.
{"title":"Organ Pipe Cactus, Stenocereus thurberi, with Fleshy Leaves on Spherical Short-Shoots that Have Indeterminate Growth","authors":"Root Gorelick","doi":"10.2985/026.023.0101","DOIUrl":"https://doi.org/10.2985/026.023.0101","url":null,"abstract":"Abstract: \u0000 Neoraimondia have short-shoots comprised of a large areole with indeterminate growth (‘Kurztriebcephalien’). Flowers of some other cacti are subtended by modestly large photosynthetic leaves. Many specimens of the organ pipe cactus, Stenocereus thurberi, seem to have all these traits: large short-shoots with indeterminate growth and fleshy photosynthetic leaves. Short-shoots in organ pipe cactus grow new photosynthetic leaves at their apical meristem and sometimes flower, branch, and form discrete areoles with new spines. However, unlike short-shoots in Neoraimondia, spherical short-shoots of Stenocereus thurberi seem to retain chlorenchyma and lack extensive cork development.","PeriodicalId":50413,"journal":{"name":"Haseltonia","volume":"14 1","pages":"117 - 125"},"PeriodicalIF":1.5,"publicationDate":"2017-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"73725703","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Abstract: The names Agave gustaviana J.N.Haage & E.Schmidt and A. maximiliana Baker (Asparagaceae / Agavaceae) are typified in preparation of the conservation of A. maximiliana against A. gustaviana. For this purpose a specimen, “Agave maximiliana Hort. Kew Feb. 22nd 1881 N.E. Brown s.n.” (K000543880) kept at K is designated as neotype. Since Baker (1877), when he published the name A. maximiliana, cited the earlier A. gustaviana as a synonym of the former, both A. gustaviana and A. maximiliana have the same type. The name A. gustaviana was published in 1874, i.e., three years before A. maximiliana, and will have to be adopted for this economically important species, unless the conservation proposal is successful.
{"title":"Typification of the Names Agave gustaviana J.N.Haage & E.Schmidt and A. Maximiliana Baker (Asparagaceae / Agavaceae)","authors":"Gideon F. Smith","doi":"10.2985/026.023.0112","DOIUrl":"https://doi.org/10.2985/026.023.0112","url":null,"abstract":"Abstract: \u0000 The names Agave gustaviana J.N.Haage & E.Schmidt and A. maximiliana Baker (Asparagaceae / Agavaceae) are typified in preparation of the conservation of A. maximiliana against A. gustaviana. For this purpose a specimen, “Agave maximiliana Hort. Kew Feb. 22nd 1881 N.E. Brown s.n.” (K000543880) kept at K is designated as neotype. Since Baker (1877), when he published the name A. maximiliana, cited the earlier A. gustaviana as a synonym of the former, both A. gustaviana and A. maximiliana have the same type. The name A. gustaviana was published in 1874, i.e., three years before A. maximiliana, and will have to be adopted for this economically important species, unless the conservation proposal is successful.","PeriodicalId":50413,"journal":{"name":"Haseltonia","volume":"72 1","pages":"92 - 96"},"PeriodicalIF":1.5,"publicationDate":"2017-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"72928229","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Abstract: A new species of Gasteria from the Klein Karoo near Calitzdorp is named, differing from G. brachyphylla by its leaves which are spirally arranged and larger keeled, as well as its flowering which is during summer and autumn.
{"title":"Gasteria koenii, a New Gasteria Species from the Swartberg, Western-Cape, South Africa","authors":"E. Jaarsveld","doi":"10.2985/026.023.0107","DOIUrl":"https://doi.org/10.2985/026.023.0107","url":null,"abstract":"Abstract: \u0000 A new species of Gasteria from the Klein Karoo near Calitzdorp is named, differing from G. brachyphylla by its leaves which are spirally arranged and larger keeled, as well as its flowering which is during summer and autumn.","PeriodicalId":50413,"journal":{"name":"Haseltonia","volume":"49 1","pages":"48 - 52"},"PeriodicalIF":1.5,"publicationDate":"2017-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"78487068","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
F. Verloove, Águedo Marrero Rodríguez, M. Salas-Pascual, A. Guiggi
Abstract: Recent field work in Gran Canaria (Canary Islands, Spain), mostly in March and April 2017, yielded first records of 10 species of Cactaceae, all originally introduced as ornamentals. Cylindropuntia bigelovii, C. imbricata, C. prolifera, Disocactus speciosus, Opuntia lindheimeri and O. microdasys are locally naturalized or likely to become so, whereas Ferocactus herrerae, Harrisia tetracantha, Lophocereus schottii and Trichocereus spachianus are considered casuals. All these species are illustrated, georeferenced localities provided and other useful information, especially with regard to their identification and invasion status (in Gran Canaria as well as elsewhere in the world) are also presented. The presence of two further species, Opuntia monacantha and O. robusta, both often considered doubtful in the Canary Islands, is confirmed from Gran Canaria. New data are also provided for Opuntia leucotricha and O. pilifera, two species that were recently recorded for the first time for Gran Canaria, that seem to have increased.
{"title":"New Records of Cactaceae from Gran Canaria (Canary Islands, Spain)","authors":"F. Verloove, Águedo Marrero Rodríguez, M. Salas-Pascual, A. Guiggi","doi":"10.2985/026.023.0111","DOIUrl":"https://doi.org/10.2985/026.023.0111","url":null,"abstract":"Abstract: \u0000 Recent field work in Gran Canaria (Canary Islands, Spain), mostly in March and April 2017, yielded first records of 10 species of Cactaceae, all originally introduced as ornamentals. Cylindropuntia bigelovii, C. imbricata, C. prolifera, Disocactus speciosus, Opuntia lindheimeri and O. microdasys are locally naturalized or likely to become so, whereas Ferocactus herrerae, Harrisia tetracantha, Lophocereus schottii and Trichocereus spachianus are considered casuals. All these species are illustrated, georeferenced localities provided and other useful information, especially with regard to their identification and invasion status (in Gran Canaria as well as elsewhere in the world) are also presented. The presence of two further species, Opuntia monacantha and O. robusta, both often considered doubtful in the Canary Islands, is confirmed from Gran Canaria. New data are also provided for Opuntia leucotricha and O. pilifera, two species that were recently recorded for the first time for Gran Canaria, that seem to have increased.","PeriodicalId":50413,"journal":{"name":"Haseltonia","volume":"1 1","pages":"79 - 91"},"PeriodicalIF":1.5,"publicationDate":"2017-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"74463302","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Abstract: Taxonomically, Kalanchoe rotundifolia (Haw.) Haw. (Crassulaceae) is one of the most complex of the southern African representatives of the genus. The expression of its vegetative morphology, especially leaf shape and plant size, is exceedingly variable. The reproductive morphology is more constant in terms of the size and shape of the corolla tube and lobes, as well as in the upper part of the corolla tube and lower part of the corolla lobes invariably becoming twisted at the post-anthesis stage. However, flower colour ranges from a yellow-infused light orange through pinkish-red to scarlet. At present we conclude that treating the species as a variable complex in southern and eastern Africa, as well as Socotra, is taxonomically the most sensible. We provide an amplified description and geographical distribution map for K. rotundifolia, and discuss and illustrate some of the remarkably variable forms. A neotype is designated for the name Kalanchoe integerrima Lange.
{"title":"Notes on Kalanchoe rotundifolia (Haw.) Haw. (Crassulaceae) in Southern Africa: The Taxonomy of a Species Complex","authors":"Gideon F. Smith, E. Figueiredo","doi":"10.2985/026.023.0109","DOIUrl":"https://doi.org/10.2985/026.023.0109","url":null,"abstract":"Abstract: \u0000 Taxonomically, Kalanchoe rotundifolia (Haw.) Haw. (Crassulaceae) is one of the most complex of the southern African representatives of the genus. The expression of its vegetative morphology, especially leaf shape and plant size, is exceedingly variable. The reproductive morphology is more constant in terms of the size and shape of the corolla tube and lobes, as well as in the upper part of the corolla tube and lower part of the corolla lobes invariably becoming twisted at the post-anthesis stage. However, flower colour ranges from a yellow-infused light orange through pinkish-red to scarlet. At present we conclude that treating the species as a variable complex in southern and eastern Africa, as well as Socotra, is taxonomically the most sensible. We provide an amplified description and geographical distribution map for K. rotundifolia, and discuss and illustrate some of the remarkably variable forms. A neotype is designated for the name Kalanchoe integerrima Lange.","PeriodicalId":50413,"journal":{"name":"Haseltonia","volume":"20 1","pages":"57 - 71"},"PeriodicalIF":1.5,"publicationDate":"2017-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"90929112","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Abstract: “Cacti are different.” This sentence holds true for many aspects of the functional morphology and anatomy of cacti in comparison to other perennial plants. The biomechanical adaptations, especially of tree-like columnar cacti, seem to be unique. The scope of this small review is to elucidate some of their specific load adaptation strategies and how they deviate from — or are similar to — typical hardwood trees.
{"title":"Comparative Analysis of Load Adaptation Strategies in Columnar Cacti and Hardwood Trees","authors":"H. Schwager","doi":"10.2985/026.023.0102","DOIUrl":"https://doi.org/10.2985/026.023.0102","url":null,"abstract":"Abstract: “Cacti are different.” This sentence holds true for many aspects of the functional morphology and anatomy of cacti in comparison to other perennial plants. The biomechanical adaptations, especially of tree-like columnar cacti, seem to be unique. The scope of this small review is to elucidate some of their specific load adaptation strategies and how they deviate from — or are similar to — typical hardwood trees.","PeriodicalId":50413,"journal":{"name":"Haseltonia","volume":"93 1","pages":"10 - 2"},"PeriodicalIF":1.5,"publicationDate":"2017-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"86279177","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Abstract: We describe a new species, Leipoldtia nevillei Klak, known from several populations between Soebatsfontein and Wallekraal in the coastal plain of Namaqualand, South Africa. The new species is easily recognized as a member of the Leipoldtia-clade by its smooth, xeromorphic leaves, mostly 10-locular fruits with large closing bodies and broad valve wings. In habit and floral morphology it resembles most closely the monotypic Hallianthus H.E.K.Hartmann, but it lacks the high turret-shaped fruits and the prominent subcentral elevations on the covering membranes that are characteristic for Hallianthus. In addition, L. nevillei differs from other species of Leipoldtia L.Bolus and from Hallianthus by its pale yellow or white flowers with a pale yellow centre. In the closely related Cephalophyllum the fruits form closing bulges below the covering membranes, whereas L. nevillei has closing rodlets below the covering membranes, as is typical for Leipoldtia.
摘要/ Abstract摘要:本文描述了在南非纳马夸兰沿海平原Soebatsfontein和Wallekraal之间的几个种群中发现的一新种leopoldtia nevillei Klak。该新种具有光滑的旱胚状叶片，果实多为10室，果体大，瓣翅宽。在习性和花形态上，它与单型的哈特曼花莲最相似，但它缺乏哈特曼花莲所特有的高的塔状果实和突出的覆盖膜上的亚中心高度。此外，它的花呈浅黄色或白色，花心呈浅黄色，与其他种类的雷波达亚(lepoldtia L. bolus)和大莲花(Hallianthus)不同。在密切相关的头叶植物中，果实在覆盖膜下形成闭合的凸起，而L. nevillei在覆盖膜下具有闭合的小棒，这是典型的Leipoldtia。
{"title":"Leipoldtia nevillei (Aizoaceae: Ruschieae), a New Species from Coastal Namaqualand, South Africa","authors":"C. Klak, P. Bruyns","doi":"10.2985/026.023.0114","DOIUrl":"https://doi.org/10.2985/026.023.0114","url":null,"abstract":"Abstract: We describe a new species, Leipoldtia nevillei Klak, known from several populations between Soebatsfontein and Wallekraal in the coastal plain of Namaqualand, South Africa. The new species is easily recognized as a member of the Leipoldtia-clade by its smooth, xeromorphic leaves, mostly 10-locular fruits with large closing bodies and broad valve wings. In habit and floral morphology it resembles most closely the monotypic Hallianthus H.E.K.Hartmann, but it lacks the high turret-shaped fruits and the prominent subcentral elevations on the covering membranes that are characteristic for Hallianthus. In addition, L. nevillei differs from other species of Leipoldtia L.Bolus and from Hallianthus by its pale yellow or white flowers with a pale yellow centre. In the closely related Cephalophyllum the fruits form closing bulges below the covering membranes, whereas L. nevillei has closing rodlets below the covering membranes, as is typical for Leipoldtia.","PeriodicalId":50413,"journal":{"name":"Haseltonia","volume":"129 1","pages":"110 - 116"},"PeriodicalIF":1.5,"publicationDate":"2017-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"90877386","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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