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Flora Data (Last Modified On 10/16/2012)
PlaceOfPublication Syn. P1. -1:97. 1805.
Synonym Graphephorum Desv. Nouv. Bull. Soc. Philom. (Paris) 2:189. 1810.
Description Spikelets 2- to 3-flowered, the rachilla usually villous, disarticulating above the glumes and between the florets (in our species), prolonged beyond the upper- most floret; glumes somewhat unequal, acute, the second usually longer than the first floret; lemmas usually short-bearded at the base, 2-toothed at the apex, bear ing from the back, below the cleft apex, a straight and included or usually geniculate and exserted awn (minutely lobed and awnless or nearly so in T. pringlei) .
Note Slender to tall and rather coarse perennials with flat narrow blades and open or usually narrow and rather dense panicles.
Key a. Culms 15-45 cm. high; lemmas awnless or nearly so, minutely lobed I. T. PRINGLEI aa. Culms 50-120 cm. high; lemmas awned, the awn 7-10 mm. long, geniculate. b. Panicles silvery, almost plume-like from the copious callus hairs protruding from the glumes; glumes nearly equal in size and shape, narrow, 1-nerved - ------ 2. T. DEYEUXIOIDES bb. Panicles greenish or purplish, not plume-like, the callus hairs short; glumes unequal, the first 1-nerved, the second broader, 3-nerved - 3. T. IRAZUENSE