Panicum anceps |
Panicum rigidulum |
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beak panicgrass |
redtop panic grass, redtop panicum, smooth witchgrass |
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Habit | Plants perennial; conspicuously rhizomatous, rhizomes short or elongate, stout, scaly. | Plants perennial; cespitose, not rhizomatous, occasionally purple-tinged throughout, mostly glabrous throughout (except as noted). | ||||||||||||||||||||
Culms | 30-130 cm, terete to slightly compressed. |
35-150 cm, stout, compressed. |
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Sheaths | laterally compressed, glabrous or sparsely to densely pilose or villous, especially at the summit; ligules less than 0.5 mm, membranous, erose, often brownish; blades 10-50 cm long, 4-12 mm wide, erect, adaxial surfaces pilose at least basally, glabrous or pilose abaxially. |
more or less strongly compressed or keeled, sides usually glabrous or sparsely pubescent distally; ligules 0.3-3 mm, membranous, erose or ciliate, cilia often themselves fimbriate; blades 8-50 cm long, 2-12 mm wide, flat or folded, both surfaces usually glabrous or scabridulous, or the adaxial surfaces sparsely pilose basally. |
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Panicles | 10-40 cm, 1/4 - 2/3 as wide as long, well-exserted at anthesis; branches relatively few, stiffly spreading or ascending; ultimate branchlets 1-sided; pedicels 0.1-3 mm, scabridulous to scabrous, appressed. |
terminal and axillary, 9-40 cm, 1/3 – 3/4 as wide as long, usually dense; ultimate branchlets usually appressed, 1-sided, scabridulous; pedicels 0.5-1.5 mm, usually appressed, sometimes with 1-several slender hairs at the apices. |
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Spikelets | 2.3-3.9 mm, narrowly ellipsoid to ovoid, usually subsessile, usually pale to yellowish-green, glabrous, often falcate and gaping at the apices, rarely lanceolate, densely crowded on short, appressed branchlets, set obliquely on short pedicels. |
usually 1.6-3.8 mm, usually subsessile, lanceolate, green, purple-tinged, or purple, glabrous. |
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Lower glumes | A-A as long as the spikelets, 3-veined, keels scabrous, apices acute; upper glumes and lower lemmas subequal, keeled, beaked, usually gaping at the apices; lower florets sterile; lower paleas subequal to the lower lemmas; upper florets 1.5-2.2 mm long, about 1 mm wide, 2/5 – 3/4 as long as the spikelets, apices with a tuft of minute, thick hairs; upper lemmas thick, stiff, clasping the upper paleas throughout their length. |
2/5 – 3/4 as long as the spikelets, 3-veined, midveins keeled; upper glumes and lower lemmas subequal or the glumes slightly longer, often spreading slightly apart at the apices, midveins keeled, usually scabridulous apically; lower florets sterile; lower paleas to 2/3 as long as the lower lemmas; upper florets 1.4-2 mm long, 0.6-0.8 mm wide, 2/5 – 3/4 as long as the spikelets, occasionally stipitate, lustrous, with a tuft of minute, thickish hairs at the apices; upper lemmas thick, stiff, clasping the upper paleas throughout their length. |
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2n | = 18, 36. |
=18. |
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Panicum anceps |
Panicum rigidulum |
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Distribution |
AL; AR; DC; DE; FL; GA; IA; IL; IN; KS; KY; LA; MD; MO; MS; NC; NJ; NY; OH; OK; PA; SC; TN; TX; VA; WV
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AL; AR; CA; CT; DC; DE; FL; GA; IL; IN; KS; KY; LA; MA; MD; ME; MI; MO; MS; NC; NH; NJ; NY; OH; OK; OR; PA; RI; SC; TN; TX; VA; VT; WI; WV; PR; BC; NS; ON |
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Discussion | Panicum anceps grows in low, moist, primarily sandy areas, pine savannahs, the borders of flood-plain swamps, mesic woodlands, roadsides, and upland pine-hardwood forests. It is restricted to the United States. (Discussion copyrighted by Flora of North America; reprinted with permission.) |
Panicum rigidulum grows in swamps, wet woodlands, flood-plain forests, wet pine savannahs, marshy shores of rivers, ponds, and lakes, drainage ditches, and other similar wet to moist places; it is rarely found in dry sites. Its range extends from southern Canada to Mexico, Guatemala, and the Antilles. (Discussion copyrighted by Flora of North America; reprinted with permission.) |
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Key |
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Source | FNA vol. 25, p. 478. | FNA vol. 25, p. 477. | ||||||||||||||||||||
Parent taxa | Poaceae > subfam. Panicoideae > tribe Paniceae > Panicum > subg. Agrostoidea > sect. Agrostoidea | Poaceae > subfam. Panicoideae > tribe Paniceae > Panicum > subg. Agrostoidea > sect. Agrostoidea | ||||||||||||||||||||
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Name authority | Michx. | Bosc ex Nees | ||||||||||||||||||||
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