Setaria setosa |
Setaria chapmanii |
|
---|---|---|
West Indian bristlegrass, West Indies bristlegrass |
Chapman's bristlegrass |
|
Habit | Plants perennial. | Plants perennial; cespitose. |
Culms | 50-100 cm; nodes usually glabrous. |
40-100 cm, erect, slender; nodes glabrous. |
Sheaths | glabrous or finely pubescent, margins ciliate distally; ligules of 1 mm hairs; blades 15-20 cm long, 6-12 mm wide, flat or folded, often finely pubescent on both surfaces. |
mostly glabrous, margins ciliate distally; ligules 0.1-0.4 mm, of stiff hairs; blades 15-40 cm long, 2-5 mm wide, those of the basal leaves involute, those of the cauline leaves flat, adaxial surfaces sparsely pilose basally. |
Panicles | 15-20 cm, loosely spikelike, interrupted, attenuate; rachises often villous; branches ascending, lower branches about 2.5 cm; bristles usually solitary, less than 10 mm, antrorsely scabrous. |
to 35 cm, nodding, slender, interrupted; rachises scabridulous; branches 5-20, erect, axes 0.4-3.2 cm, undulating, with 3-12 spikelets in 2 ranks, a single bristle present below the terminal spikelets; bristles 3-6 mm. |
Spikelets | 2-2.5 mm, ovate-lanceolate. |
1.8-2.2 mm, obovate, turgid. |
Lower glumes | about 1/2 as long as the spikelets, 3-veined; upper glumes about 2/3 as long as the spikelets, 5-7-veined; lower lemmas equaling the upper lemmas; lower paleas as long as the upper paleas, broad; upper lemmas finely and distinctly transversely rugose. |
0.6-0.8 mm, about 1/3 as long as the spikelets, 3-veined; upper glumes equaling the upper lemmas, 5-7-veined; lower lemmas equaling the upper lemmas; lower paleas absent; upper lemmas finely and transversely rugose; anthers 0.9-1.1 mm. |
2n | = unknown. |
= unknown. |
Setaria setosa |
Setaria chapmanii |
|
Distribution |
AL; FL; NJ; PR; Virgin Islands |
|
Discussion | Setaria setosa is native to the West Indies and Mexico. It is probably a recent introduction to Florida, but appears to be established there. The specimen from New Jersey was from a ballast dump; the species is not established in that state. (Discussion copyrighted by Flora of North America; reprinted with permission.) |
Setaria chapmanii is native to soils of coral or shell origin in the Florida Keys, the Bahamas, Cuba, and the Yucatan Peninsula, Mexico. The absence of the lower palea makes S. chapmanii unusual in subg. Paurochaetium. (Discussion copyrighted by Flora of North America; reprinted with permission.) |
Source | FNA vol. 25, p. 550. | FNA vol. 25, p. 545. |
Parent taxa | Poaceae > subfam. Panicoideae > tribe Paniceae > Setaria > subg. Setaria | Poaceae > subfam. Panicoideae > tribe Paniceae > Setaria > subg. Paurochaetium |
Sibling taxa | ||
Synonyms | Paspalidium chapmanii | |
Name authority | (Sw.) P. Beauv. | (Vasey) Pilg. |
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