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Published In: Species Plantarum 1: 82. 1753. (1 May 1753) (Sp. Pl.) Name publication detailView in BotanicusView in Biodiversity Heritage Library

Project Name Data (Last Modified On 6/2/2011)
Acceptance : Accepted
Project Data     (Last Modified On 6/3/2011)
General/Distribution: A genus of about 260 species in areas of poor dry soils with low rainfall (but scarcely true deserts into which Stipagrostis extends) throughout the tropics and subtropics especially along the Tropics of Cancer and Capricorn; 7 species occur in Pakistan.


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Densely tufted perennials or annuals, usually without a rootstock. Leaf blades linear, usually in a basal tuft, but in annual species borne mainly on the culms. Panicle effuse, contracted or spike-like. Spikelets 1-flowered with long scarious glumes; lemma cylindrical or laterally compressed, indurated, glabrous or scabrid, rarely sparsely hairy, the margins convolute or involute, produced into a 3-branched awn (rarely the lateral branches obsolete); awn with or without a column, articulated or not, the branches glabrous or scabrid, never plumose; callus well-developed, obtuse, bifid or acuminate; palea usually less than half as long as the lemma.

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1 Lemma (or column) not articulated at its summit (2)
+ Lemma or column articulated at the summit and breaking cleanly across when mature (4)
2 (1) Lateral branches of the awn well developed, if shorter than the central then of similar texture and not bristle-like; lemma straight, without a bend below the column (3)
+ Lateral branches of the awn absent or much reduced, or if up to 15 mm long then bristle-like and much finer than the central branch; tip of lemma with a semi-circular bend below the column Aristida abnormis
3 (2) Annual or short-lived perennial; panicle ± contracted; awns usually less than 2 cm long; glumes never awned Aristida adscensionis
+ Tufted robust perennial; panicle effuse, often as broad as long; awns 2 cm long; glumes usually awned Aristida cyanantha
4 (1) Articulation at the base of the column (5)
+ Articulation at the top of the column, just below the awns Aristida mutabilis
5 (4) Lower glume shorter than the upper; base of the callus pointed or forked (6)
+ Lower glume always longer than the upper; base of the callus pointed Aristida funiculata
6 (5) Callus forked at the base, a dwarf plant Aristida hystricula
+ Callus sharp at the tip and curved; plants 20-65 cm tall Aristida triticoides

Lower Taxa
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