Tridens flavus |
Tridens flavus var. chapmanii |
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purpletop, purpletop tridens |
Chapman's tridens |
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Habit | Plants with firm, knotty, shortly rhizomatous bases. | |||||
Culms | 60-180 cm. |
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Sheaths | keeled, mostly glabrous, collars pubescent; ligules to 0.5 mm, membranous, ciliate; blades 3-10 mm wide, glabrous or sparsely hispid, apices attenuate and involute. |
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Panicles | 15-40 cm long, 3-5 cm wide, erect or nodding; branches 10-15(25) cm, strongly divergent to drooping, stiff or lax, lower branches naked for 1/3 – 1/2 of their length; pedicels 3-8 mm. |
usually erect throughout; branches stiff; pulvini conspicuously hairy, hairs extending around the base of the branches. |
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Spikelets | 5-10 mm long, with 4-8 florets. |
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Lower glumes | 2.5-3 mm, often mucronate; upper glumes 3.5-4 mm; lemmas 3-5 mm, lateral veins puberulent or ciliate to well above midlength, midveins and lateral veins usually excurrent, midveins extending to 0.5 mm, lateral vein extensions shorter; paleas as long as the lemmas, widened below; anthers 1-1.5 mm. |
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Caryopses | 1.8-2 mm. |
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2n | = 40. |
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Tridens flavus |
Tridens flavus var. chapmanii |
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Distribution |
AL; AR; CA; CT; DC; DE; FL; GA; IA; IL; IN; KS; KY; LA; MA; MD; MI; MN; MO; MS; NC; NE; NH; NJ; NM; NY; OH; OK; PA; RI; SC; TN; TX; VA; VT; WI; WV; ON
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AL; AR; DE; FL; GA; LA; MO; MS; NC; NJ; OK; SC; TN; TX; VA |
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Discussion | Tridens flavus var. chapmanii grows in pine and oak woods of the southeastern United States from Missouri to Virginia and south from easter Texas to Florida. (Discussion copyrighted by Flora of North America; reprinted with permission.) |
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Key |
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Source | FNA vol. 25, p. 39. | FNA vol. 25, p. 39. | ||||
Parent taxa | Poaceae > subfam. Chloridoideae > tribe Cynodonteae > Tridens | Poaceae > subfam. Chloridoideae > tribe Cynodonteae > Tridens > Tridens flavus | ||||
Sibling taxa | ||||||
Subordinate taxa | ||||||
Synonyms | Triodia sesleroidies, Triodia flava, T. flavus forma cupreus, Poa flava | T. chapmanii | ||||
Name authority | (L.) Hitchc. | (Small) Shinners | ||||
Web links |
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