PhytoKeys最新文献

A new species exhibiting cauliflory within the tribe Argostemmateae (Rubiaceae), Mycetia saxicola Z.Q. Song & D.X. Xu, is described and illustrated from limestone areas in Yunnan, China. Our comprehensive study, which includes literature reviews, field and herbarium morphological observations, and molecular phylogenetic analyses of five plastid DNA regions, reveals that M. saxicola is closely related to M. fangii K.J. Yan & Z.Q. Song. Morphologically, both species share several key features, including cauliflorous inflorescences, few flowers per inflorescence, eglandular bracts and bracteoles, short corolla tubes, and calyx lobes much shorter than the corolla. However, M. saxicola can be readily distinguished from M. fangii by its limestone habitat, subcoriaceous leaves, linear stipules, very short pedicels and peduncles, and a calyx bearing two sessile, deciduous glands on each sinus. Additionally, this paper provides illustrations of six other relevant species of Mycetia to facilitate further taxonomic comparisons.

This study describes and illustrates Viola yuelingensis Y.S.Chen & Ju H.Huang, a new species distributed in Guangxi, China. The species is morphologically most similar to Viola yunnanensis, but can be distinguished by the following characteristics: prominently raised reddish-brown midveins on both leaf surfaces with inconspicuous lateral veins on the adaxial side (vs. wrinkled adaxial surface with depressed and often green midvein), and lower petal white or pale purple toward the base, pale purple toward the apex with purple stripes (vs. lower petal white with purple stripes). The species is distinct from V. changii by its leaf blades with serrate margins (vs. obtusely serrate to subentire), and an abaxial surface that is grayish-green (vs. deep purple). Color photographs, a distribution map, and a comparison with the most similar species are provided.

This checklist of Malagasy Cucurbitaceae comprises 26 genera with 77 species and five varieties, including five new species to be formally described when more complete ecological and genetic data are available. Of the 82 taxa, 65 are classified as indigenous, and of those, 52 species and 5 varieties are endemic (88% of the native taxa). Six exotic species have permanent populations outside cultivation (naturalised exotics). Another eleven exotics are cultivated and occasionally found escaped from cultivation (casuals). The checklist covers taxonomic information including type specimen(s), vernacular names, DNA sequence information, photos, global and national distribution data with status (endemic, non-endemic native, naturalised, or cultivated), plus ecological and habitat information. Our analysis of IUCN conservation status suggests that half of the native species (32) are threatened, mainly due to habitat destruction. For 12 taxa we lack information to suggest IUCN status but many of them might turn out to be threatened or even extinct. Nine species are absent from protected area, 21 were found only in a single reserve. The Andohahela National Park is home to the greatest Cucurbitaceae diversity with 13 species, followed by Zombitsy-Vohibasia with 12 species. The most species-rich genera are Peponium (up to ten endemic species), Zehneria (eight species, six of them endemic), Ampelosycios and Xerosicyos (each seven endemic species). Our study reveals overlooked diversity in a plant family of global importance and highlights the need for additional fieldwork and collection in several genera, including Cayaponia, Cyclantheropsis, Peponium, and Kedrostis.

The genus Monstera is a diverse group of nomadic vines endemic to the Neotropics, with its greatest diversity concentrated in the montane forests of southern Central America. The Cordillera de Talamanca, spanning southern Costa Rica and western Panama, has emerged as a hotspot for pachycaul Monstera species which exhibit large leaf and inflorescence sizes. This study presents the discovery and description of two new giant Monstera species from Panama: M. corana and M. colossica. Both species occur relatively close to M. gigas in the cloud forests of the southern Talamanca range, an area characterised by high humidity, persistent cloud cover and heterogeneous volcanic soils. We provide detailed morphological descriptions, field observations, distribution maps and comparisons with morphologically related taxa.

Clematis liana sp. nov., a new species of Ranunculaceae from Zhejiang and Anhui Provinces in eastern China, is described and illustrated. This species exhibits similarities in morphological features to C. urticifolia, with which it has a close evolutionary relationship. It is distinguishable by several discrete features, such as habit, reproductive strategy, morphology of cauline ridges, leaflets, bracts, and flowers, calycine color, number of carpels and stamens, length and indumentum of filaments, size of anthers and pollen grains, etc. The complete plastid genome sequence of C. liana sp. nov. comprises 159,759 bp, organized into a quadripartite structure containing two inverted repeat (IR: 31,084 bp each) regions, a small single copy (SSC: 18,135 bp) region, and a large single copy (LSC: 79,456 bp) region. It contains 136 functional, comprising 92 protein-coding, 36 tRNA and 8 rRNA genes.

The complex taxonomic history of the moss genus Neckera, whose name was conserved at the Paris Congress in 1954, is reviewed. The issue of typifications of moss generic names by W. Ph. Schimper in 1860 is examined in detail and it is concluded that these typifications comply with the provisions of the "International Code of Nomenclature for algae, fungi and plants". Schimper was the first to typify Neckera with N. pennata, so it is unnecessary to treat this as a conserved type. The unitary designations of moss species proposed by Jakob Friedrich Ehrhart in his exsiccata "Phytophylacium Ehrhartianum", published between 1780 and 1785, are reviewed. It is concluded that two of these designations, Diphyscium and Paludella, are currently in use, having been validly published in the early nineteenth century. The same applies to Rhystophyllum, another of Ehrhart's unitary designations, which was validated as a subsection of Neckera by C. Müller in 1850 and, subsequently, first elevated to the rank of section by Mitten in 1869, rather than Braithwaite in 1905 as listed in "Index muscorum". Finally, E. Britton raised this infrageneric taxon to the rank of genus in 1904. Rhystophyllum is here reinstated from obscurity, since it is homotypic with the generic name Exsertotheca that was recently introduced for a segregate of Neckera. Accordingly, three new combinations are proposed: Rhystophyllum crispum, Rh. intermedium and Rh. baeticum. Neckera subsect. Leiophyllum is regarded as a heterotypic synonym of Alleniella, another recent segregate of the formerly broadly circumscribed genus Neckera.

Doronicum micranthum (Asteraceae, Senecioneae), a new species from Hui County and Liangdang County in southeastern Gansu Province, China, is described and illustrated. This species is closely related to D. stenoglossum Maxim. and D. conaense Y.L.Chen, with which it shares the following characters: the ray florets are equal to or shorter than the involucre, and the small capitula are arranged in racemes at the stem apex. It differs by having swollen (vs. not swollen) rhizomes, smaller capitula (0.5-1.4 vs. 2-2.5 cm in diameter), and all florets' achenes that are glabrous and lack a pappus (vs. achenes in all florets puberulent, pappus present, or glabrous and without pappus in ray florets, densely pubescent and bearing a pappus in disk florets).

Paraphlomis leigongshanensis G.B. Jiang & W.H. Yao (Lamiaceae), a new species endemic to Leigong Mountain National Nature Reserve (Guizhou, China), is described and illustrated. Morphologically, it is most similar to P. jiangyongensis, but can easy be distinguished by its lamina shape, calyx teeth shape, and corolla color. A close relationship between the new species and P. gracilis var. lutienensis was revealed by molecular phylogenetic analyses based on ETS and ITS sequences, but they are morphologically distinct from each other. With only three known populations (ca. 200 mature individuals) in subtropical evergreen forests, the new species is assessed as Endangered (EN) under IUCN criteria B2ab(iii); D.

This study elucidates the taxonomic affinity of Orophea yunnanensis by considering whether it belongs to Orophea or Alphonsea. Integrating comparative morphological analysis of type and living materials, field investigations, and molecular phylogenetic evidence, we confirm that O. yunnanensis should be transferred to Alphonsea as a distinct species. A new combination Alphonsea yunnanensis (P.T.Li) Y.H.Tan & Bin Yang is proposed. The mature floral morphology and fruits of A. yunnanensis are described for the first time based on wild-collected living specimens and recent herbarium collections. Detailed descriptions, color plates, and geographical distribution, and conservation assessments are provided.

Acronema handeloides, a new species of Apiaceae from Jiaozi Mountain in Yunnan Province, is described and illustrated herein. This species is similar to A. handelii and A. sichuanense but can be distinguished by its 1-2 branches; variable basal leaves; bracts 1 or occasionally present, bracteoles 1-3; subulate calyx teeth; linear-subulate, papillate petal apex; and broadly ovoid. Phylogenetic analyses also support that it is a monophyletic group sister to A. handelii and A. sichuanense. In accordance with the IUCN Red List criteria (2024), the conservation status of A. handeloides is preliminarily assessed as Data Deficient (DD).