Abstract: Spines are an important component of cactus species. Besides providing protection from predation, they reduce heat loading, reduce transpiration, and aid dispersal of stem segments for vegetative propagation among others. Bark formation occurs on surfaces of more than twenty species of columnar cacti in the Americas. For all species tested, bark formation is related to direct sunlight exposure. Extensive bark coverage leads to premature death for saguaro cacti (Carnegiea gigantea). Preliminary evidence indicates that changes in areoles with spines occurred during the bark formation on C. gigantea. Four hundred, sixty-one paired photographic images of areoles of north- and south-facing surfaces of shoots with bark percentages on adjacent troughs in 2017 were analyzed to determine differences between north- and south-facing surfaces. As in past studies, south-facing surfaces had higher bark percentages (mean bark coverage 62%) than north-facing surfaces (mean bark coverage 19%). For north and south areoles, mean numbers of central spines were 2.70/1.55; radial spines 3.20/1.50; and apex spines 1.81/1.13, respectively. When data were pooled to compare numbers of central, radial and apex spines as well as spine color and spine thickness, all were significantly related with bark percentages. Decreases in numbers and characteristics of spines precede bark formation on adjacent troughs. Overall, the results show that crests deteriorate faster than adjacent troughs. To our knowledge, this is the first report to document changes in spine numbers and characteristics with bark coverage on a cactus species.
{"title":"Areole Changes during Bark Formation on Saguaro Cacti","authors":"L. Evans, Ryan L'Abbat","doi":"10.2985/026.024.0109","DOIUrl":"https://doi.org/10.2985/026.024.0109","url":null,"abstract":"Abstract: Spines are an important component of cactus species. Besides providing protection from predation, they reduce heat loading, reduce transpiration, and aid dispersal of stem segments for vegetative propagation among others. Bark formation occurs on surfaces of more than twenty species of columnar cacti in the Americas. For all species tested, bark formation is related to direct sunlight exposure. Extensive bark coverage leads to premature death for saguaro cacti (Carnegiea gigantea). Preliminary evidence indicates that changes in areoles with spines occurred during the bark formation on C. gigantea. Four hundred, sixty-one paired photographic images of areoles of north- and south-facing surfaces of shoots with bark percentages on adjacent troughs in 2017 were analyzed to determine differences between north- and south-facing surfaces. As in past studies, south-facing surfaces had higher bark percentages (mean bark coverage 62%) than north-facing surfaces (mean bark coverage 19%). For north and south areoles, mean numbers of central spines were 2.70/1.55; radial spines 3.20/1.50; and apex spines 1.81/1.13, respectively. When data were pooled to compare numbers of central, radial and apex spines as well as spine color and spine thickness, all were significantly related with bark percentages. Decreases in numbers and characteristics of spines precede bark formation on adjacent troughs. Overall, the results show that crests deteriorate faster than adjacent troughs. To our knowledge, this is the first report to document changes in spine numbers and characteristics with bark coverage on a cactus species.","PeriodicalId":50413,"journal":{"name":"Haseltonia","volume":"197 1","pages":"55 - 62"},"PeriodicalIF":1.5,"publicationDate":"2018-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"76955417","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: Kalanchoe hirta Harv. was included in the synonymy of Kalanchoe crenata (Andrews) Haw. in the Flora of Southern Africa treatment of the family Crassulaceae. We here reinstate K. hirta as a good species. Descriptions are provided for K. hirta and K. crenata, and characters distinguishing them noted and illustrated. The regional geographical distributions of both species are mapped.
{"title":"The Taxonomy of Kalanchoe hirta Harv. and K. crenata (Andrews) Haw. (Crassulaceae), and Reinstatement of K. hirta as a Distinctive, Endemic Species from Southern and South-Tropical Africa","authors":"Gideon F. Smith, E. Figueiredo, N. Crouch","doi":"10.2985/026.024.0107","DOIUrl":"https://doi.org/10.2985/026.024.0107","url":null,"abstract":"Abstract: Kalanchoe hirta Harv. was included in the synonymy of Kalanchoe crenata (Andrews) Haw. in the Flora of Southern Africa treatment of the family Crassulaceae. We here reinstate K. hirta as a good species. Descriptions are provided for K. hirta and K. crenata, and characters distinguishing them noted and illustrated. The regional geographical distributions of both species are mapped.","PeriodicalId":50413,"journal":{"name":"Haseltonia","volume":"76 1","pages":"40 - 50"},"PeriodicalIF":1.5,"publicationDate":"2018-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"77435222","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}
W. C. Cardoso, Alice Calvente, V. F. Dutra, C. M. Sakuragui
Abstract: Cactaceae are a highly endangered plant family with economical and ornamental potential. One of its centers of diversity and endemism is in Eastern Brazil, including the Atlantic Forest in the state of Espírito Santo. The latest Brazilian global floristic inventory recorded 41 cactus species for this state, however an exclusive study about Cactaceae is still necessary to survey and describe the actual diversity of the family in the region and current threats acting upon the cacti. The aim of this study was to survey the species of Cactaceae in Espírito Santo state and analyze the threats suffered by them. A database produced from fieldwork, herbarium and literature research resulted in 908 georeferenced records which served for the production of distribution maps and to analyze sampling efforts and species richness. The richest grid cells were positively correlated to the best sampled cells. In total 38 native species of Cactaceae were found, including epiphytic, rupicolous, and terricolous life-forms. Several threats to the conservation of cacti in the region are acting to reduce the habitat of native populations. Our results indicate the need to include an effective sampling of cactus specimens in order to understand the real conservation of the species of this highly endangered family.
{"title":"Anthropic Pressure on the Diversity of Cactaceae in a Region of Atlantic Forest in Eastern Brazil","authors":"W. C. Cardoso, Alice Calvente, V. F. Dutra, C. M. Sakuragui","doi":"10.2985/026.024.0105","DOIUrl":"https://doi.org/10.2985/026.024.0105","url":null,"abstract":"Abstract: Cactaceae are a highly endangered plant family with economical and ornamental potential. One of its centers of diversity and endemism is in Eastern Brazil, including the Atlantic Forest in the state of Espírito Santo. The latest Brazilian global floristic inventory recorded 41 cactus species for this state, however an exclusive study about Cactaceae is still necessary to survey and describe the actual diversity of the family in the region and current threats acting upon the cacti. The aim of this study was to survey the species of Cactaceae in Espírito Santo state and analyze the threats suffered by them. A database produced from fieldwork, herbarium and literature research resulted in 908 georeferenced records which served for the production of distribution maps and to analyze sampling efforts and species richness. The richest grid cells were positively correlated to the best sampled cells. In total 38 native species of Cactaceae were found, including epiphytic, rupicolous, and terricolous life-forms. Several threats to the conservation of cacti in the region are acting to reduce the habitat of native populations. Our results indicate the need to include an effective sampling of cactus specimens in order to understand the real conservation of the species of this highly endangered family.","PeriodicalId":50413,"journal":{"name":"Haseltonia","volume":"141 1","pages":"28 - 35"},"PeriodicalIF":1.5,"publicationDate":"2018-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"88549913","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: An obligatory cremnophyte, Delosperma expersum var. decumbens is transferred to the genus Drosanthemum and raised to species level. Drosanthemum decumbens grows on upper quartzitic sandstone cliff faces of the Table Mountain Group (Cape Supergroup) in the Ceres and Worcester region of the Western Cape, South Africa. It differs from Drosanthemum expersum by its re-sprouting lignotuber, procumbent to pendent stems, shorter pedicels 10–15 (–35) mm long, and fruiting capsules turning reddish before drying.
摘要/ Abstract摘要:作为一种专性蕨类植物，Delosperma expersum vars decumbens被转移到Drosanthemum属，并上升到种水平。Drosanthemum decumbens生长在南非西开普省Ceres和Worcester地区的桌山群(Cape Supergroup)的上石英砂岩悬崖面上。它的不同之处在于其再发芽的块茎，匍匐到下垂的茎，较短的花梗10-15(-35)毫米长，果蒴果在干燥前变红。
{"title":"Drosanthemum decumbens (Aizoaceae), a New Status for an Obligatory Cremnophyte from the Western Cape, South Africa","authors":"E. Jaarsveld","doi":"10.2985/026.024.0102","DOIUrl":"https://doi.org/10.2985/026.024.0102","url":null,"abstract":"Abstract: An obligatory cremnophyte, Delosperma expersum var. decumbens is transferred to the genus Drosanthemum and raised to species level. Drosanthemum decumbens grows on upper quartzitic sandstone cliff faces of the Table Mountain Group (Cape Supergroup) in the Ceres and Worcester region of the Western Cape, South Africa. It differs from Drosanthemum expersum by its re-sprouting lignotuber, procumbent to pendent stems, shorter pedicels 10–15 (–35) mm long, and fruiting capsules turning reddish before drying.","PeriodicalId":50413,"journal":{"name":"Haseltonia","volume":"50 1","pages":"2 - 6"},"PeriodicalIF":1.5,"publicationDate":"2018-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"80718178","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}
Roberto CARRERA-MARTÍNEZ, Jorge Ruiz-Arocho, Laura A. Aponte-Díaz, D. Jenkins
Abstract: The island of Puerto Rico is home to five species of columnar, globular and semi-epiphytic cacti: Pilosocereus royenii, Melocactus intortus, Stenocereus fimbriatus, Leptocereus quadricostatus and Hylocereus trigonus. However, their ecology and natural history are still largely unknown. We visited a total of 12 sites during four years. We identified habitat preferences for each cactus species; recorded the incidence of fires and the invasion of grasses in these habitats. We also recorded bird-cactus interactions during 150 hrs. of observation. Observations on the reproduction biology of S. fimbriatus is provided for the first time, and differences of M. intortus morphology of two populations were assessed. Finally, we identify different threats to the Puerto Rican native cacti and dry forests. We also identified various questions on the basic ecology and biology of these cactus species that should be addressed in future works.
{"title":"Natural History Notes for the Columnar, Globular and Semi-Epiphytic Cactus Species of the Island of Puerto Rico","authors":"Roberto CARRERA-MARTÍNEZ, Jorge Ruiz-Arocho, Laura A. Aponte-Díaz, D. Jenkins","doi":"10.2985/026.024.0104","DOIUrl":"https://doi.org/10.2985/026.024.0104","url":null,"abstract":"Abstract: The island of Puerto Rico is home to five species of columnar, globular and semi-epiphytic cacti: Pilosocereus royenii, Melocactus intortus, Stenocereus fimbriatus, Leptocereus quadricostatus and Hylocereus trigonus. However, their ecology and natural history are still largely unknown. We visited a total of 12 sites during four years. We identified habitat preferences for each cactus species; recorded the incidence of fires and the invasion of grasses in these habitats. We also recorded bird-cactus interactions during 150 hrs. of observation. Observations on the reproduction biology of S. fimbriatus is provided for the first time, and differences of M. intortus morphology of two populations were assessed. Finally, we identify different threats to the Puerto Rican native cacti and dry forests. We also identified various questions on the basic ecology and biology of these cactus species that should be addressed in future works.","PeriodicalId":50413,"journal":{"name":"Haseltonia","volume":"47 1","pages":"24 - 27"},"PeriodicalIF":1.5,"publicationDate":"2018-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"81742526","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 typification of the names Agave convallis Trelease and A. dissimulans Trelease is discussed and clarified. We show that the two Trelease 4 specimens associated with the name A. convallis are not duplicates (they have different collecting dates). The Trelease 4 specimen dated 5 February 1905 (barcode MO-1128755; MO specimen number 3346866) is the lectotype of the name A. convallis, while the other Trelease 4 specimen dated 12 February 1905 (barcode MO-1256267; MO specimen number 3346867) is a syntype. We confirm the lectotypification of the name A. dissimulans, with one of the two Trelease 81 specimens dated 11 February 1905 (barcode MO-1128757; MO specimen number 3346870). The other Trelease 81 specimen, which is also dated 11 February 1905 (barcode MO-1128758; MO specimen number 3346869), is an isolectotype. The typification status of Trelease 82, which is also dated 11 February 1905 [barcode MO-1256273; MO specimen number 3346871], is that of syntype. All the Trelease specimens mentioned here are held in the Herbarium of the Missouri Botanical Garden (MO). For the sake of completeness we also refer to the typification, and clarify the etymology, of the name Agave kerchovei Lem. This species is a close relative of A. convallis and A. dissimulans.
{"title":"Notes on the Typification and Nomenclature of Agave dissimulans Trelease, Agave convallis Trelease, and Agave kerchovei Lem. (Asparagaceae: Agavoideae / Agavaceae)","authors":"Gideon F. Smith, Estrela Figuereido, G. Starr","doi":"10.2985/026.024.0106","DOIUrl":"https://doi.org/10.2985/026.024.0106","url":null,"abstract":"Abstract: The typification of the names Agave convallis Trelease and A. dissimulans Trelease is discussed and clarified. We show that the two Trelease 4 specimens associated with the name A. convallis are not duplicates (they have different collecting dates). The Trelease 4 specimen dated 5 February 1905 (barcode MO-1128755; MO specimen number 3346866) is the lectotype of the name A. convallis, while the other Trelease 4 specimen dated 12 February 1905 (barcode MO-1256267; MO specimen number 3346867) is a syntype. We confirm the lectotypification of the name A. dissimulans, with one of the two Trelease 81 specimens dated 11 February 1905 (barcode MO-1128757; MO specimen number 3346870). The other Trelease 81 specimen, which is also dated 11 February 1905 (barcode MO-1128758; MO specimen number 3346869), is an isolectotype. The typification status of Trelease 82, which is also dated 11 February 1905 [barcode MO-1256273; MO specimen number 3346871], is that of syntype. All the Trelease specimens mentioned here are held in the Herbarium of the Missouri Botanical Garden (MO). For the sake of completeness we also refer to the typification, and clarify the etymology, of the name Agave kerchovei Lem. This species is a close relative of A. convallis and A. dissimulans.","PeriodicalId":50413,"journal":{"name":"Haseltonia","volume":"45 1","pages":"36 - 39"},"PeriodicalIF":1.5,"publicationDate":"2018-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"81883005","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 solitary plant of the putative intercladal cross Echinopsis (Leucostele) atacamensis subsp. atacamensis × Echinopsis (Soehrensia) formosa was observed in the contact zone of the mostly allopatric populations of the parent species in the Salar de Atacama region in the Chilean Andes. The plant is intermediate between the parents in its characters. It was found to be sterile, despite normal-looking anthers (with abundant pollen) and stigma. In addition, an apparently typical individual of E. atacamensis with yellow flowers has been found, but it remains unknown whether this is merely a flower colour variant, or whether hybridization could be involved.
{"title":"A Putative Intercladal Echinopsis s.l. (Cactaceae) Hybrid from Andean Chile","authors":"U. Eggli, Mario Giorgetta","doi":"10.2985/026.024.0103","DOIUrl":"https://doi.org/10.2985/026.024.0103","url":null,"abstract":"Abstract: A solitary plant of the putative intercladal cross Echinopsis (Leucostele) atacamensis subsp. atacamensis × Echinopsis (Soehrensia) formosa was observed in the contact zone of the mostly allopatric populations of the parent species in the Salar de Atacama region in the Chilean Andes. The plant is intermediate between the parents in its characters. It was found to be sterile, despite normal-looking anthers (with abundant pollen) and stigma. In addition, an apparently typical individual of E. atacamensis with yellow flowers has been found, but it remains unknown whether this is merely a flower colour variant, or whether hybridization could be involved.","PeriodicalId":50413,"journal":{"name":"Haseltonia","volume":"44 1","pages":"15 - 7"},"PeriodicalIF":1.5,"publicationDate":"2018-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"89525714","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: In this paper Ceropegia reflexa Hanacek, belonging to Ceropegia sect. Rhytidocaulon, is described. It is known from one locality in the Al Mahra Governorate of Yemen in the southern part of the Arabian Peninsula. This new species is characterized by long pedicels, reflexed corolla lobes and the unusual twisted cilia along the margins of the lobes. Ceropegia reflexa occurs together with C. fulleri in rocky parts of Jabal Fartak, but at lower altitudes and in less exposed places than C. fulleri. A key to the nine Arabian members of Ceropegia sect. Rhytidocaulon is provided.
{"title":"A New Species of Ceropegia Sect. Rhytidocaulon (Apocynaceae) from Southern Yemen","authors":"P. Hanáček, P. Bruyns","doi":"10.2985/026.024.0108","DOIUrl":"https://doi.org/10.2985/026.024.0108","url":null,"abstract":"Abstract: In this paper Ceropegia reflexa Hanacek, belonging to Ceropegia sect. Rhytidocaulon, is described. It is known from one locality in the Al Mahra Governorate of Yemen in the southern part of the Arabian Peninsula. This new species is characterized by long pedicels, reflexed corolla lobes and the unusual twisted cilia along the margins of the lobes. Ceropegia reflexa occurs together with C. fulleri in rocky parts of Jabal Fartak, but at lower altitudes and in less exposed places than C. fulleri. A key to the nine Arabian members of Ceropegia sect. Rhytidocaulon is provided.","PeriodicalId":50413,"journal":{"name":"Haseltonia","volume":"71 1","pages":"51 - 54"},"PeriodicalIF":1.5,"publicationDate":"2018-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"83336503","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: Chromosome numbers are determined for 524 individuals belonging to 107 taxa, including nothotaxa, within Cactaceae. Chromosome morphology was uniform within and among species. Nine unnamed nothotaxa and one previously named nothotaxon, Cylindropuntia ×vivipara, have chromosome numbers reported for the first time, and new chromosome numbers are reported for three taxa. Five putative Cylindropuntia hybrids are reported here for the first time: C. alcahes var. gigantensis × C. lindsayi, C. bernardina × C. echinocarpa, C. leptocaulis × C. ramosissima, C. echinocarpa × C. ramosissima, and C. echinocarpa × C. ganderi var. ganderi. Two putative Opuntia hybrids of less-certain origin are reported here: O. azurea var. discolor × O. rufida, and O. chlorotica × O. engelmannii. Two putative hybrids are reported for Echinocereus: E. arizonicus subsp. arizonicus × E. bonkerae subsp. bonkerae and E. coccineus subsp. coccineus × E. yavapaiensis. All chromosome number determinations reported to date are tabulated for Cylindropuntia, Grusonia, and selected taxa within Echinocereus. The significance of these data is discussed, including apparent correlations among polyploidy, subdioecy, sexual reproduction, and apomixis. We introduce six new combinations, one nothospecies designation, and a lectotypification for one taxon.
摘要/ Abstract摘要:对仙人掌科107个分类群(包括nothotaxa)的524个个体进行了染色体数目测定。染色体形态在种内和种间是一致的。9个未命名的notho分类群和1个已命名的notho分类群圆柱形属×vivipara首次报道了染色体数目，3个分类群报道了新的染色体数目。本文首次报道了5种柱头属植物的推测杂交品种，分别为:巨壶C. alcahes var. gigantensis × C. lindsayi、伯纳德C. bernardina × C. echinocarpa、细茎C. leptocaulis × C. ramosissima、针叶C. echinocarpa × C. ramosissima、针叶C. echinocarpa × C. ganderi var. ganderi。这里报道了两种来源不太确定的推测的机会花杂交种:O. azurea var. discolor × O. rufida和O. chlorotica × O. engelmannii。据报道，棘球蚴有两种可能的杂交体:亚利桑那棘球蚴亚种。黄鳝亚科;棘球绦虫和棘球绦虫亚种。yavapaiensis。所有的染色体数目测定报告到目前为止，表为圆柱纲，格鲁索尼亚，并在棘皮动物中选定的分类群。讨论了这些数据的意义，包括多倍体、亚雌雄异株、有性生殖和无融合之间的明显相关性。我们介绍了6个新的组合，1个新物种命名和1个分类单元的电分型。
{"title":"Chromosome Numbers in Some Cacti of Western North America — IX","authors":"M. Baker, D. Pinkava","doi":"10.2985/026.025.0103","DOIUrl":"https://doi.org/10.2985/026.025.0103","url":null,"abstract":"Abstract: Chromosome numbers are determined for 524 individuals belonging to 107 taxa, including nothotaxa, within Cactaceae. Chromosome morphology was uniform within and among species. Nine unnamed nothotaxa and one previously named nothotaxon, Cylindropuntia ×vivipara, have chromosome numbers reported for the first time, and new chromosome numbers are reported for three taxa. Five putative Cylindropuntia hybrids are reported here for the first time: C. alcahes var. gigantensis × C. lindsayi, C. bernardina × C. echinocarpa, C. leptocaulis × C. ramosissima, C. echinocarpa × C. ramosissima, and C. echinocarpa × C. ganderi var. ganderi. Two putative Opuntia hybrids of less-certain origin are reported here: O. azurea var. discolor × O. rufida, and O. chlorotica × O. engelmannii. Two putative hybrids are reported for Echinocereus: E. arizonicus subsp. arizonicus × E. bonkerae subsp. bonkerae and E. coccineus subsp. coccineus × E. yavapaiensis. All chromosome number determinations reported to date are tabulated for Cylindropuntia, Grusonia, and selected taxa within Echinocereus. The significance of these data is discussed, including apparent correlations among polyploidy, subdioecy, sexual reproduction, and apomixis. We introduce six new combinations, one nothospecies designation, and a lectotypification for one taxon.","PeriodicalId":50413,"journal":{"name":"Haseltonia","volume":"41 1","pages":"29 - 5"},"PeriodicalIF":1.5,"publicationDate":"2018-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"77995362","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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