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(Last Modified On 10/16/2012)
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(Last Modified On 10/16/2012)
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Genus
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THRASYA
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PlaceOfPublication
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Nov. Gen. & Sp. 1:120. P1. 39. 1815.
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Description
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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.
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Note
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Branching perennials with narrow flat blades and solitary, terminal and axillary, straight or usually curved racemes.
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Key
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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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