Poa wolfii |
Poa chapmaniana |
|
---|---|---|
Wolf's bluegrass |
Chapman's blue grass |
|
Habit | Plants perennial; not rhizomatous, not stoloniferous, loosely tufted. | Plants annual; densely tufted, tuft bases narrow, not stoloniferous, not rhizomatous. |
Culms | 25-90 cm. |
5-30(40) cm tall, 0.3-0.7 mm thick, erect or the bases geniculate; nodes terete, usually 1 exserted. |
Sheaths | closed for 1/2 - 3/4 their length, smooth or sparsely scabrous, margins not ciliate; ligules 0.3-2.1 mm, smooth or sparsely scabrous, truncate to obtuse, ciliolate; blades 0.6-3.5 mm wide, flat. |
closed for 1/10 – 1/2 their length, terete or weakly compressed, smooth; ligules 0.7-5 mm, decurrent, truncate to acute; blades of innovations and culms similar, 2-5(8) cm long, 0.6-2.8 mm wide, flat or folded, thin, soft, smooth, margins scabrous, apices narrowly prow-shaped. |
Basal branching | mainly pseudointravaginal. |
|
Panicles | 7.5-15(18) cm, lax, pyramidal, open, sparse; nodes with 1-3(5) branches; branches 3-8 cm, ascending, straight to spreading, angled, angles prominent, scabrous. |
2-9.6 cm, erect, eventually open, moderately to densely congested, with 1-4(7) branches per node; branches eventually ascending to spreading, rarely reflexed, terete, smooth or sparsely scabrous, spikelet-bearing to near the base or middle. |
Spikelets | 4-6.5 mm, laterally compressed; florets 2-5; rachilla internodes to 1 mm, smooth, glabrous. |
(2)2.4-4.5 mm, laterally compressed; florets (1)2-6; rachilla internodes usually shorter than 0.7 mm, smooth or scabrous, glabrous. |
Glumes | 1/2-1/3 the length of the adjacent lemmas, distinctly keeled, keels scabrous; lower glumes subulate to narrowly lanceolate, (1)3-veined; upper glumes shorter than or subequal to the lowest lemmas; calluses webbed; lemmas (2.5)3.2-4.7 mm, lanceolate, green, distinctly keeled, keels and marginal veins long-villous, hairs extending up almost the whole keel length, lateral veins prominent, intercostal regions smooth, minutely bumpy, usually glabrous, rarely sparsely softly puberulent, apices acute, blunt, or pointed, white, not bronze; palea keels softly puberulent at midlength, apices scabrous; anthers (0.5)0.8-1.2(1.5) mm. |
subequal, about 3/4 as long as to subequal to the adjacent lemmas, lanceolate, thin, distinctly keeled, keels scabrous; lower glumes 1-3-veined; calluses webbed; lemmas 1.9-3 mm, broadly lanceolate, distinctly keeled, smooth, keels and marginal veins short- to long-villous, hairs on the keels extending to near the apices, lateral veins obscure, usually softly puberulent, intercostal regions usually sparsely softly puberulent, apices obtuse to acute; palea keels softly puberulent to long-villous at midlength, scabrous near the apices; anthers 1, 0.1-0.2(0.3) mm. |
2n | = 28. |
= unknown. |
Poa wolfii |
Poa chapmaniana |
|
Distribution |
AR; IA; IL; IN; MN; MO; OH; VA; WI
|
AL; AR; DE; FL; GA; IA; IL; IN; KS; KY; LA; MA; MD; MO; MS; NC; NE; NY; OH; OK; SC; TN; TX; VA; WV |
Discussion | Poa wolfii is an uncommon species that grows in boggy areas of eastern deciduous forests, primarily west of the Appalachian divide. It differs from P. sylvestris (p. 512) in having fewer branches, larger spikelets, and lemmas that are usually glabrous between the veins. (Discussion copyrighted by Flora of North America; reprinted with permission.) |
Poa chapmaniana is native from the central part of the Great Plains east and southward to the coast. It grows in dry to mesic forests, forest openings, and the margins of bottomlands, often in disturbed ground and on acidic substrates. Records from New York probably represent introductions. Its web and single short anther distinguish P. chapmaniana from P. annua (p. 520) and most plants of P. bigelovii. It also differs from P. bigelovii (see below), probably its closest relative, in having narrower leaf blades, and panicle branches that are eventually spreading. (Discussion copyrighted by Flora of North America; reprinted with permission.) |
Source | FNA vol. 24, p. 514. | FNA vol. 24, p. 534. |
Parent taxa | Poaceae > subfam. Pooideae > tribe Poeae > Poa > subg. Poa > sect. Sylvestres | Poaceae > subfam. Pooideae > tribe Poeae > Poa > subg. Poa > sect. Homalopoa |
Sibling taxa | ||
Name authority | Scribn. | Scribn. |
Web links |