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Project Name Data (Last Modified On 10/16/2012)

Flora Data (Last Modified On 10/16/2012)
PlaceOfPublication Nov. Gen. & Sp. 1:120. P1. 39. 1815.
Description Spikelets in pairs in two rows on one side of a narrow- to broad-winged rachis, turned back to back, the first subsessile, the second pedicellate, the pedicel adnate to the rachis, the spikelets thus appearing solitary; first glume small, sometimes hyaline; second glume usually shorter than the fruit, acute; sterile lemma indurate, sulcate and often splitting down the middle at maturity, enclosing a well-developed palea and usually a staminate flower; fruit indurate, striate, with a few stiff hairs at the tip, the margins narrow, firm, not inrolled.
Note Branching perennials with narrow flat blades and solitary, terminal and axillary, straight or usually curved racemes.
Key a. Rachis broadly winged, 3-4 mm. wide; culms rather coarse, 1-1.5 m. high; spikelets 4 mm. long -1. T. PETROSA aa. Rachis 1-2 mm. wide; culms not more than 90 cm. high, usually less; spikelets 2.2-3.5 mm. long. b. Racemes 8-20 cm. long; rachis -1.5-2 mm. wide; culms 70-90 cm. high. c. Spikelets 3.5 mm. long, the second glume and sterile lemma sparse- ly pilose on the margins; rachis 2 mm. wide; blades pubescent on both surfaces -2. T. HITCHCOCKII cc. Spikelets 2.8 mm. long, glabrous; rachis 1.5 mm. wide; blades glabrous or scabrous, prominently papillose-hispid-ciliate - 3. T. CILIATIFOLIA bb. Racemes 2-5 cm. long; rachis 0.5-1 mm. wide; culms not more than 50 cm. high. c. Sheaths and blades glabrous or more or less papillose-hirsute; spikelets 2.2 mm. long, glabrous ---4. T. GRACILIS cc. Sheaths and blades densely and softly villous; spikelets 2.5 mm. long, densely villous ------ 5. T. VILLOSA
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