Poa wolfii |
Poa suksdorfii |
|
---|---|---|
Wolf's bluegrass |
Suksdorf's bluegrass, western blue grass |
|
Habit | Plants perennial; not rhizomatous, not stoloniferous, loosely tufted. | Plants perennial; not glaucous; densely tufted, not stoloniferous, not rhizomatous. |
Culms | 25-90 cm. |
7-25 cm. |
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 1/7-1/4(1/3) their length, terete; ligules of cauline leaves 1-3 mm, milky white, usually densely scabrous, sometimes smooth, ligules of the upper innovation leaves 0.5-2.5 mm; innovation blades adaxially scabrous, hispidulous, or puberulent on and between the veins, lacking papillae on the long cells (at 100x); cauline blades folded to involute, moderately thick, soft or moderately firm, apices narrowly prow-shaped, flag leaf blades 1-2 mm wide, adaxial surfaces with 5-9 well-spaced ribs. |
Basal branching | mainly pseudointravaginal. |
all or mainly intravaginal. |
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. |
3-6 cm, erect, narrowly lanceoloid, contracted, moderately congested; nodes with 1-2 branches; branches to 1.5 cm, erect, slender, terete, sulcate or angled, smooth or the angles moderately scabrous; pedicels shorter than the spikelets. |
Spikelets | 4-6.5 mm, laterally compressed; florets 2-5; rachilla internodes to 1 mm, smooth, glabrous. |
4.2-7 mm, laterally compressed, often strongly anthocyanic; florets 2-4; rachilla internodes 1-1.5 mm, smooth, sometimes sparsely hispidulous. |
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. |
lanceolate, distinctly keeled, keels smooth; lower glumes shorter than to equaling the lowest lemmas, 3-veined; upper glumes frequently exceeding the lowest lemmas, 3-5-veined, exceeded by the upper lemmas; calluses glabrous; lemmas 4.1-5.8 mm, narrowly lanceolate, distinctly keeled, thin, glabrous, apices acute; palea keels scabrous; anthers 0.8-1.2(1.7) mm, infrequently aborted late in development. |
2n | = 28. |
= unknown. |
Poa wolfii |
Poa suksdorfii |
|
Distribution |
AR; IA; IL; IN; MN; MO; OH; VA; WI
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OR; WA; BC
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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 suksdorfii is a high alpine species of open rocky ground in the Pacific Northwest. It used to be interpreted (Hitchcock 1951) as including California populations that are now placed in Poa pringlei (p. 564) or P. keckii (see previous). Poa suksdorfii has narrow panicles like P. pringlei and P. curtifolia (p. 589). (Discussion copyrighted by Flora of North America; reprinted with permission.) |
Source | FNA vol. 24, p. 514. | FNA vol. 24, p. 584. |
Parent taxa | Poaceae > subfam. Pooideae > tribe Poeae > Poa > subg. Poa > sect. Sylvestres | Poaceae > subfam. Pooideae > tribe Poeae > Poa > subg. Poa > sect. Abbreviatae |
Sibling taxa | ||
Name authority | Scribn. | (Beal) Vasey ex Piper |
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