Poa pratensis subsp. colpodea

(Th. Fr.) Tzvelev
Synonyms: Poa alpigena var. colpodea
Treatment appears in FNA Volume 24. Treatment on page 526.
Please click on the illustration for a higher resolution version.
Illustrator: Sandy Long

Copyright: Utah State University

Plants strongly anthocyanic; moderately densely to loosely tufted, shoots solitary. Basal branching mainly extravaginal. Culms 15-30 cm. Innovation shoot blades shorter than 15 cm, 1-3.6 mm wide, flat or folded, soft, adaxial surfaces usually glabrous, sometimes sparsely pubescent; cauline blades flat or folded. Panicles 4-8 cm, narrowly pyramidal or contracted, with (1) 2-5 branches per node; branches 1-3 (5) cm, ascending or eventually spreading, smooth or sparsely scabrous, with several spikelets per branch. Spikelets narrowly lanceolate, bulbiferous, the least deformed spikelets 4-5.5 mm; florets mostly bulb-forming. Glume keels distinct, smooth or sparsely scabrous distally; upper glumes 2-2.5 (3) mm, nearly equaling the lowest lemmas; lemmas 2.5-3.5 mm, finely muriculate, lateral-veins glabrous; palea keels scabrous, frequently softly puberulent at midlength, intercostal regions usually glabrous, rarely sparsely hispidulous; anthers usually aborted, sometimes a few fairly well developed. 2n = ca. 27, 35, 35, 37, 38, 42, 51, 52, 56, 60, 66, 68, 69, 72, 73, 74, 75, 76, 77, 78, 79, 80, 81.

Discussion

Poa pratensis subsp. colpodea is circumpolar. In the Flora region, its range extends from Alaska and British Columbia to Greenland. It is more common than P. pratensis subsp. alpigena in the high arctic. The two sometimes grow together, and there is some evidence of a shift in dominance from year to year.

Selected References

None.

Lower Taxa

None.

"decumbent" is not a number.

81 +, 80 +, 79 +, 78 +, 77 +, 76 +, 75 +, 74 +, 73 +, 72 +, 69 +, 68 +, 66 +, 60 +, 56 +, 52 +, 51 +, 42 +, 38 +, 37 +, 35 +  and 27 +
membranous +  and scarious +
pubescent +  and glabrous +
5 cm50 mm <br />0.05 m <br /> (?) +
0.12 cm1.2 mm <br />0.0012 m <br /> (0.2 cm2 mm <br />0.002 m <br />) +
scarious-hyaline +
Robert J. Soreng +
(Th. Fr.) Tzvelev +
1 (?) +  and 3 (?) +
straight +
basal +  and terminal +
keeled +  and rounded +
strigose +  and glabrous +
not branching +
intravaginal +, extravaginal +, branching +  and basal +
not swollen +, compressed +  and terete +
swelling +
not evident +
involute +, folded +  and flat +
subequal +
thin;thick +
5 cm50 mm <br />0.05 m <br /> (?) +
flexuous +  and straight +
spreading;ascending +
hispidulous +, glabrous +, smooth or +  and sparsely densely scabrous +
angled +  and terete +
compressed +  and terete +
folded +  and flat +
unbranched +  and hollow +
compressed +  and terete +
15 cm150 mm <br />0.15 m <br /> (30 cm300 mm <br />0.3 m <br />) +
not woody +
Conn. +, N.J. +, N.Y. +, Wash. +, Va. +, Del. +, D.C. +, Wis. +, W.Va. +, Pacific Islands (Hawaii) +, Mass. +, Maine +, N.H. +, R.I. +, Vt. +, Fla. +, Wyo. +, N.Mex. +, Tex. +, La. +, Puerto Rico +, Tenn. +, N.C. +, S.C. +, Pa. +, Calif. +, Nev. +, Colo. +, Alaska +, Ill. +, Md. +, Minn. +, Mont. +, Ala. +, Ark. +, Ariz. +, Ga. +, Iowa +, Idaho +, Ind. +, Kans. +, Ky. +, Mich. +, Mo. +, Miss. +, N.Dak. +, Nebr. +, Ohio +, Okla. +, Oreg. +, S.Dak. +, Utah +, 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 5 +
compressed +
reduced +
1-3(5)-veined +
usually distinctly shorter +
shorter or longer +
subtending +
keeled +, lanceolate +  and narrowly lanceolate +
unequal +  and subequal +
distributed +
straight +, sinuous +  and curving +
erect +  and appressed +
uncinate +
slender +
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 (?) +
0.04 cm0.4 mm <br />4.0e-4 m <br /> (0.1 cm1 mm <br />0.001 m <br />) +
milky white +  and slightly greenish +
puberulent +  and long-villous +
5(7-11)-veined +
purple-tinged +  and green +
hairy +, glabrous +  and chartaceous +
muriculate +
keeled +  and lanceolate +
0.25 cm2.5 mm <br />0.0025 m <br /> (0.35 cm3.5 mm <br />0.0035 m <br />) +
membranous +
erose +  and entire +
white +  and milky white or hyaline +
glabrous +  and ciliolate +
obtuse +, truncate +  and rounded +
0.09 cm0.9 mm <br />9.0e-4 m <br /> (0.2 cm2 mm <br />0.002 m <br />) +
membranous +
inconspicuous +
lobed +  and lanceolate +
sickle--shaped +, usually narrowly lanceolate +  and lanceolate +
0.15 cm1.5 mm <br />0.0015 m <br /> (0.4 cm4 mm <br />0.004 m <br />) +
muriculate +  and smooth +
1 +  and 2 +
compressed +  and terete +
2 +  and 1 +
well-developed +
2-keeled +
subequal +
20 cm200 mm <br />0.2 m <br /> (?) +
pyramidal +
4 cm40 mm <br />0.04 m <br /> (8 cm80 mm <br />0.08 m <br />) +
dry +  and fleshy +
hairy +, infrequently sparsely +  and glabrous +
terete +  and slightly compressed +
deformed +  and lanceolate +
0.4 cm4 mm <br />0.004 m <br /> (0.55 cm5.5 mm <br />0.0055 m <br />) +
1 (?) +  and 3 (?) +
simple +  and compound +
2 (?) +  and 3 (?) +
Poa alpigena var. colpodea +
Poa pratensis subsp. colpodea +
Poa pratensis +
subspecies +
membranous +
0.2 cm2 mm <br />0.002 m <br /> (0.25 cm2.5 mm <br />0.0025 m <br />) +
parallel +  and converging +
aquatic +  and terrestrial +