Panicum anceps |
Panicum trichoides |
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beak panicgrass |
small-flower panicgrass, tropical panicgrass |
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Habit | Plants perennial; conspicuously rhizomatous, rhizomes short or elongate, stout, scaly. | Plants annual. | ||||
Culms | 30-130 cm, terete to slightly compressed. |
15-100 cm tall, 0.5-1(2) mm thick, sprawling to erect, without cormlike bases, freely branching and rooting from the lower nodes; nodes prominent, glabrous or pubescent; internodes not succulent, pilose. |
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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. |
shorter than the internodes, rounded, hairs papillose-based; collars pilose; ligules 0.2-0.5 mm; blades 2-7 cm long, 5-20 mm wide, 4-6 times longer than wide, lanceolate, thin, flat, sparsely to densely pilose, hairs papillose-based, bases asymmetrically cordate to subcordate, lower margins ciliate, papillose. |
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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. |
4-24 cm, almost as wide as long, diffuse, partially included or exerted; primary branches to 10 cm, alternate, ascending to reflexed, branching in the distal 2/3; pedicels 9-20 mm, threadlike. |
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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. |
1-1.4 mm long, 0.5-0.6 mm wide, not secund, lanceoloid to narrowly ovoid, plano-convex in side view, sparsely pubescent. |
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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. |
0.4-0.8 mm, 1/3 – 1/2 as long as the spikelets, 1-3-veined, subacute; upper glumes 0.8-1.2 mm, arising 0.2 mm above the lower glumes, 3-5-veined; lower florets sterile; lower lemmas 0.1-0.2 mm longer than the upper glumes, 3-5-veined; lower paleas 0.5-0.8 mm, hyaline; upper florets 0.8-1.2 mm long, 0.4-0.6 mm wide, finely rugose, lemmas strongly convex. |
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2n | = 18, 36. |
= 18. |
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Panicum anceps |
Panicum trichoides |
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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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TX; PR; Virgin Islands |
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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 trichoides grows in moist, often weedy fields, woodlands, and savannahs of Mexico, Central and tropical America, and the Caribbean. It has been found, as a weed, in Brownsville and Austin, Texas, and is probably introduced to the Flora region. It has also been introduced into Africa, tropical Asia, and the Pacific islands. In the Flora region, it flowers from August through October. (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. 485. | ||||
Parent taxa | Poaceae > subfam. Panicoideae > tribe Paniceae > Panicum > subg. Agrostoidea > sect. Agrostoidea | Poaceae > subfam. Panicoideae > tribe Paniceae > Panicum > subg. Phanopyrum > sect. Monticola | ||||
Sibling taxa | ||||||
Subordinate taxa | ||||||
Name authority | Michx. | Sw. | ||||
Web links |