NDLI: Stipa (Poaceae) and allies in the Old World: molecular phylogenetics realigns genus circumscription and gives evidence on the origin of American and Australian lineages

Content Provider	Springer Nature Link
Author	Hamasha, Hassan R. Hagen, K. Bernhard Röser, Martin
Copyright Year	2011
Abstract	The tribe Stipeae with an estimated number of ca. 600 species is part of the grass subfamily Pooideae and has near worldwide distribution. Its species are often dominant constituents of steppe vegetation and other grasslands, especially in Eurasia, the Americas and Australia. The taxonomy of Old World Stipeae has been studied to date primarily on the basis of morphology and anatomy, while existing molecular phylogenetic investigations have mainly dealt with New World or Australian taxa. We studied 109 new ingroup taxa with a focus on Old World Stipeae (in addition with an extensive outgroup sampling) using chloroplast and nuclear ribosomal DNA sequences (3′trnK region, ITS1–5.8S gene–ITS2), and discuss taxonomic key characters. Five highly supported monophyletic lineages were identified, some of which were rather unexpected: (a) the narrowly defined Stipa core clade, which is primarily Eurasian but extends into Africa north of the Sahara Desert, (b) the majority of Old World Piptatherum, (c) a “Transcontinental Stipeae Clade” encompassing Eurasian, African, American and Australian lineages, (d) a Himalayan to E Asian clade and (e) the single species Achnatherum splendens. The large “Transcontinental Stipeae Clade” contained several lineages of Eurasian Stipeae different from the Stipa core (a), i.e., genera Aristella, Celtica, Oloptum gen. nov., Stipella stat. et. gen. nov., species of Achnatherum, and the species-rich lineages of Nassella/Jarava in America and of Austrostipa in Australia. In our circumscription Ptilagrostis was nested in (d), a clade (which included some species of Achnatherum and poorly studied Himalayan species ascribed to either Stipa or Orthoraphium) and whose internal structure remained unclear. Oloptum, gen. nov., is described, and the following combinations are made: Achnatherum pelliotii, comb. nov., Aristella keniensis, comb. nov., Oloptum miliaceum, comb. nov., Stipella, stat. et. gen. nov., S. capensis, comb. nov., S. nitens, comb. nov., S. parviflora, comb. nov., S. staintonii, comb. nov., and S. tigrensis, comb. nov.
Starting Page	351
Ending Page	367
Page Count	17
File Format	PDF
ISSN	03782697
Journal	Plant Systematics and Evolution
Volume Number	298
Issue Number	2
e-ISSN	16156110
Language	English
Publisher	Springer Vienna
Publisher Date	2011-11-09
Publisher Place	Vienna
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Feathergrasses Grasses Phylogenetics Poaceae Stipeae Plant Systematics/Taxonomy/Biogeography Plant Anatomy/Development Plant Sciences Plant Ecology
Content Type	Text
Resource Type	Article
Subject	Plant Science Ecology, Evolution, Behavior and Systematics

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Stipa (Poaceae) and allies in the Old World: molecular phylogenetics realigns genus circumscription and gives evidence on the origin of American and Australian lineages

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