The genus Tristachya (Poaceae: Panicoideae) in Madagascar
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SummaryWe present a revision of the three species of Tristachya in Madagascar. The tussock-forming T. betsileensis is a rare endemic of the quartz outcrops in the Itremo Protected Area. The rhizomatous T. isalensis and T. humbertii are common components of the sandstone outcrop vegetation in the Isalo National Park. A new combination is made. Descriptions, conservation assessments, illustrations, and a distribution map are presented.
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