Poa bolanderi |
Poa napensis |
|
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Bolander's blue grass |
Napa blue grass |
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Habit | Plants usually annual, rarely longer-lived; often glaucous; densely tufted, tuft bases narrow, sterile shoots few, not stoloniferous, not rhizomatous. | Plants perennial; fairly glaucous; densely tufted, not stoloniferous, not rhizomatous. |
Culms | 20-60(70) cm, erect or geniculate at the base; nodes terete, usually 1-3 exserted. |
30-100 cm, erect, terete, with 0(1) exserted nodes. |
Sheaths | closed for 1/2-1/4 their length, usually compressed and keeled, usually smooth, infrequently scabrous; ligules 2.5-7 mm, smooth or scabrous, usually decurrent, obtuse to acute; blades 1.5-5 mm wide, usually flat, rarely folded, lax, soft, smooth or sparsely scabrous, margins scabrous, apices broadly prow-shaped, cauline blades 3-15 cm, flag leaf blades 1-4 cm. |
closed for 1/10(1/8) their length, terete, bases of basal sheaths glabrous, distal sheath lengths 1.5-5 times blade lengths; ligules 4-6 mm, scabrous, obtuse to acute; innovation blades similar to the cauline blades; cauline blades 1-3 mm wide, folded to involute, thick, fairly firm, pale green, abaxial surfaces scabrous, apices narrowly prow-shaped. |
Basal branching | both intra- and extravaginal. |
intravaginal. |
Panicles | (5)10-15(25) cm long, 1/4-1/2 the plant height, usually erect, infrequently slightly nodding, usually eventually open, sometimes interrupted, sparse, with 1-3(5) branches per node; branches initially erect and straight, usually some eventually spreading or reflexed, smooth or sparsely to moderately scabrous. |
5-18(21) cm, erect, narrowly to broadly lanceoloid, loosely contracted, congested, with 40-100+ spikelets; nodes with 2-3(5) branches; branches 3-10 cm, erect to ascending, straight, angles densely scabrous, with 5-27 spikelets in the distal 1/2. |
Spikelets | (3)4-7 mm, laterally compressed; florets 2-3(4); rachilla internodes usually 1-1.2+ mm, smooth or sparsely scabrous, glabrous. |
(4)4.5-7 mm, lengths 3-3.5 times widths, lanceolate, laterally compressed, drab; florets 3-5; rachilla internodes usually shorter than 1 mm, smooth. |
Glumes | unequal, distinctly shorter than the adjacent lemmas, distinctly keeled, keels smooth or sparsely scabrous; lower glumes 1-3-veined, 1/2 - 2/3 the length of the upper glume, 1/2 - 2/3 the length of the lowest lemmas; upper glumes shorter than or subequal to the lowest lemmas; calluses of some or all florets sparsely webbed; lemmas 2.5-4 mm, lanceolate to narrowly lanceolate, distinctly keeled, smooth or scabrous throughout, glabrous, lateral veins obscure to moderately prominent, apices narrowly acute, usually anthocyanic near the tip; palea keels sparsely scabrous; anthers 3, 0.5-1(1.8) mm. |
lanceolate, slightly unequal, pale, distinctly keeled, keels sparsely scabrous; lower glumes 3-veined; calluses glabrous, rarely with a crown of hairs, hairs to 0.1 mm; lemmas 3-4 mm, lanceolate, distinctly keeled, finely scabrous, usually glabrous, keels and marginal veins rarely sparsely puberulent proximally, lateral veins obscure to moderately prominent, intercostal regions muriculate, margins glabrous, apices acute; paleas scabrous over the keels; anthers 1.2-1.8 mm. |
2n | = 28. |
= 42. |
Poa bolanderi |
Poa napensis |
|
Distribution |
CA; ID; NV; OR; UT; WA; BC
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CA |
Discussion | Poa bolanderi grows mainly in pine to fir forest openings of mountain slopes in the western United States, from Washington to California and Utah. It differs from P. howellii (see below) in having smooth to scabrous, rather than puberulent, lemmas; it also grows at higher elevations, mostly at 1500-3000 m. (Discussion copyrighted by Flora of North America; reprinted with permission.) |
Poa napensis is endemic to mineralized ground around hot springs in Napa County, California. It is listed as an endangered species by the United States Fish and Wildlife Service. The sectional placement of the species is suggested by the rare occurrence of a minute crown of hairs around the callus and its possession of a chloroplast genome like that of P. secunda (p. 588). (Discussion copyrighted by Flora of North America; reprinted with permission.) |
Source | FNA vol. 24, p. 533. | FNA vol. 24, p. 594. |
Parent taxa | Poaceae > subfam. Pooideae > tribe Poeae > Poa > subg. Poa > sect. Homalopoa | Poaceae > subfam. Pooideae > tribe Poeae > Poa > subg. Poa > sect. Secundae > subsect. Halophytae |
Sibling taxa | ||
Synonyms | P. howellii var. chandleri | |
Name authority | Vasey | Beetle |
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