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Issue: Vol. 684 No. 2: 11 Feb. 2025
Type: Article
Published: 2025-02-11
DOI: 10.11646/phytotaxa.684.2.2
Page range: 147-192
Abstract views: 425
PDF downloaded: 33

Phylogeny and systematics of the New World Selaginellaceae in a global context

School of Ecology and Environmental Science, Yunnan University, Kunming 650504, Yunnan, China
Department of Biology, Ecology Center, and Intermountain Herbarium, Utah State University, Logan 84322, Utah, U.S.A.
Chengdu Institute of Biology, Chinese Academy of Sciences, 23 Qunxian South Str., Tianfu New District, Chengdu, Sichuan 610213, China; Missouri Botanical Garden, 4344 Shaw Blvd, St. Louis, Missouri 63110, U.S.A.
Comparison of diversities lycophyte phylogeny Lepidoselaginella Mexiselaginella Selaginella schaffneri Sinoselaginelloideae Pteridophytes

Abstract

In recent years, there has been a surge of interest in Selaginellaceae including treatments in regional floras and the description of new species, but a comprehensive review of the phylogeny and taxonomy of the New World taxa is still lacking. Here we assembled a dataset of one plastid and five nuclear markers of 610 accessions representing ca. 338 species to reconstruct a global phylogeny with a focus on the New World taxa (291 accessions representing ca. 160 species). Our major results include: (1) Sinoselaginelloideae are resolved as sister to Pulviniella + (Lycopodioidoideae + Selaginelloideae), different from previous results, illustrating the difficulty in resolving the affinities of Sinoselaginelloideae, (2) Selaginella schaffneri, included in a large-scale phylogeny for the first time, is resolved as the third earliest-diverging lineage in the family and a new genus, Mexiselaginella, and a new subfamily, Mexiselaginelloideae, are proposed, (3) there are ~319 (excluding four introduced/naturalized) species in 10 genera and six subfamilies in the New World and the New World is lacking 10 out of the 20 major clades (genera and/or subfamilies) in Selaginellaceae, (4) ca. 98% of the species diversity in the New World is found in Selaginelloideae and Gymnogynoideae, 69% of the species diversity is found in Selaginella s.s. alone, and ca. 96% of the species diversity is found in three genera, Selaginella s.s., Bryodesma, and Gymnogynum, (5) Selaginella rzedowskii is confirmed to have dorsal rhizophores and transferred to Lepidoselaginella, and (6) a list of species, genera, and subfamilies in Selaginellaceae from the New World is compiled and provided and a key to genera and subfamilies in the New World is given.

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How to Cite

Zhou, X.-M., Rothfels, C.J. & Zhang, L.-B. (2025) Phylogeny and systematics of the New World Selaginellaceae in a global context. Phytotaxa 684: 147–192. https://doi.org/10.11646/phytotaxa.684.2.2