Poa sublanata

Reverd.
Common names: Cottonball bluegrass
Treatment appears in FNA Volume 24. Treatment on page 527.
Please click on the illustration for a higher resolution version.
Illustrator: Sandy Long

Copyright: Utah State University

Plants perennial; usually anthocyanic; extensively rhizomatous, loosely tufted, culms solitary or a few together. Basal branching mainly extravaginal. Culms 20-40 (75) cm, erect or the bases decumbent, not branching above the base, terete or weakly compressed; nodes terete, proximal nodes usually not exserted. Sheaths closed for 2/5 – 1/2 their length, terete, glabrous, smooth or slightly scabrous, bases of basal sheaths glabrous, distal sheath lengths (1) 1.2-3.5 times blade lengths; collars smooth, glabrous; ligules 1.5-4 (6) mm, smooth, apices obtuse to acute, not ciliate; blades 1-3.5 (5) mm wide, folded or flat, innovation shoot blades involute, soft, abaxial surfaces glabrous, adaxial surfaces smooth or sparsely scabrous, frequently sparsely hairy with 0.2-0.8 mm hairs, slender, erect to appressed, curving, sinuous or straight, apices narrowly prow-shaped, cauline blades subequal, flag leaf-blades 1.5-8 cm. Panicles 5-9 (17) cm, narrowly lanceoloid to narrowly pyramidal, loosely contacted to open, sparse, with 25-60 spikelets and 2-5 branches per node; branches 1-3 cm, ascending to spreading, slightly flexuous to fairly straight, terete, smooth or sparsely scabrous, usually with 1-5 spikelets per branch, the spikelets moderately crowded in the distal 1/2. Spikelets 4-6.5 (8) mm, lengths to 3 times widths, laterally compressed; florets 2-4 (6); rachilla internodes shorter than 1 mm, smooth, usually glabrous, rarely with a few hairs. Glumes unequal to subequal, usually distinctly shorter than the adjacent lemmas, lanceolate, distinctly keeled, keels smooth to sparsely scabrous; lower glumes 2.8-3.5 mm, narrowly lanceolate, (1) 3-veined; upper glumes 4-4.5 (5) mm, distinctly shorter than to nearly equaling the lowest lemmas; calluses dorsally webbed, webs copious, hairs at least 1/2 times the lemma length, sometimes secondary webs present under the marginal veins; lemmas 3.7-4.5 (5) mm, lanceolate, usually strongly purple, distinctly keeled, keels, lateral-veins, and marginal veins copiously hairy, hairs cottony, lateral-veins prominent, less hairy, intercostal regions glabrous, usually smooth or finely muriculate, sometimes sparsely scabrous distally, margins narrowly hyaline, glabrous, apices acute; palea keels sparsely scabrous, long-villous at midlength, intercostal regions narrow, glabrous; anthers 1.8-2.5 mm. 2n = 56, ca. 70.

Discussion

Poa sublanata grows in the high arctic of Alaska and Russia, usually on sandy ground. Bulbiferous plants are known from Russia; none have been found in the Flora region.

Selected References

None.

Lower Taxa

None.

"decumbent" is not a number.

... more about "Poa sublanata"
membranous +  and scarious +
erect +  and appressed +
hairy +, scabrous +  and smooth +
5 cm50 mm <br />0.05 m <br /> (?) +
0.18 cm1.8 mm <br />0.0018 m <br /> (0.25 cm2.5 mm <br />0.0025 m <br />) +
scarious-hyaline +
Acute (?) +, Prow--shaped (?) +  and Obtuse (?) +
Robert J. Soreng +
Reverd. +
1 (?) +  and 3 (?) +
straight +
basal +  and terminal +
keeled +  and rounded +
strigose +  and glabrous +
not branching +
intravaginal +, extravaginal +, branching +  and basal +
compressed +  and terete +
swelling +
not evident +
flat +  and folded +
1mm;3.5mm +
slightly flexuous +  and fairly straight +
ascending;spreading +
hispidulous +, glabrous +, smooth or +  and sparsely densely scabrous +
compressed +  and terete +
Cottonball bluegrass +
extravaginal +  and basal +
compressed +  and terete +
20 cm200 mm <br />0.2 m <br /> (40 cm400 mm <br />0.4 m <br />) +
not woody +
Ill. +, Ind. +, Conn. +, N.J. +, N.Y. +, Ga. +, Wash. +, Utah +, Alaska +, Colo. +, Idaho +, N.Mex. +, Nev. +, Maine +, N.H. +, Vt. +, Del. +, D.C +, Wis. +, Iowa +, Mont. +, Oreg. +, Wyo. +, Pacific Islands (Hawaii) +, Md. +, Mass. +, R.I. +, Fla. +, Calif. +, W.Va. +, Tex. +, La. +, N.C. +, N.Dak. +, Nebr. +, Tenn. +, Ala. +, Ark. +, Ariz. +, Kans. +, Ky. +, Mich. +, Minn. +, Mo. +, Miss. +, Ohio +, Okla. +, Pa. +, Puerto Rico +, S.C. +, S.Dak. +, Va. +, Alta. +, B.C. +, Greenland +, Man. +, N.B. +, Nfld. and Labr. +, N.S. +, N.W.T. +, Nunavut +, Ont. +, P.E.I. +, Que. +, Sask. +  and Yukon +
1/4 +  and 1/3 +
liquid +, soft +  and hard +
capillary +
pistillate +  and staminate +
sometimes longer +
2 +  and 4 +
compressed +
reduced +
1-3(5)-veined +
usually distinctly shorter +
shorter or longer +
subtending +
keeled +  and lanceolate +
unequal +  and subequal +
distributed +
1/2 times the lemma length +
uncinate +
0.02 cm0.2 mm <br />2.0e-4 m <br /> (0.08 cm0.8 mm <br />8.0e-4 m <br />) +
0 +  and 1/6 +
Oval (?) +  and Round (?) +
milky white +  and slightly greenish +
scabrous +  and smooth to sparsely +
5(7-11)-veined +
hairy +, glabrous +  and chartaceous +
keeled +  and lanceolate +
0.37 cm3.7 mm <br />0.0037 m <br /> (0.45 cm4.5 mm <br />0.0045 m <br />) +
membranous +
erose +  and entire +
white +  and milky white or hyaline +
ciliolate +  and glabrous +
truncate +  and acute +
0.15 cm1.5 mm <br />0.0015 m <br /> (0.4 cm4 mm <br />0.004 m <br />) +
membranous +
inconspicuous +
lobed +  and lanceolate +
0.28 cm2.8 mm <br />0.0028 m <br /> (0.35 cm3.5 mm <br />0.0035 m <br />) +
concealed +  and prominent +
0 +  and 5 +
2 +  and 1 +
well-developed +
2-keeled +
subequal +
17 cm170 mm <br />0.17 m <br /> (?) +
narrowly lanceoloid +  and narrowly pyramidal +
5 cm50 mm <br />0.05 m <br /> (9 cm90 mm <br />0.09 m <br />) +
dry +  and fleshy +
compressed +
0.4 cm4 mm <br />0.004 m <br /> (0.65 cm6.5 mm <br />0.0065 m <br />) +
1 (?) +  and 3 (?) +
simple +  and compound +
2 (?) +  and 3 (?) +
Gramineae +
Poa sublanata +
Poa sect. Poa +
species +
membranous +
0.4 cm4 mm <br />0.004 m <br /> (0.45 cm4.5 mm <br />0.0045 m <br />) +
parallel +  and converging +
aquatic +  and terrestrial +