Tridens flavus |
Tridens flavus var. flavus |
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purpletop, purpletop tridens |
purpletop 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. |
nodding distally; branches flexible; pulvini inconspicuously or conspicuously hairy, hairs confined to the adaxial side 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. flavus |
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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; 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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Discussion | Tridens flavus var. flavus grows in old fields and open woods. Its range extends to Nuevo Léon, Mexico. It was discovered for the first time in Canada in 1976, growing along a railway track in southern Ontario. (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 | |||||
Name authority | (L.) Hitchc. | unknown | ||||
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