Phleum alpinum

L.
Common names: Alpine timothy Fléole alpine Phléole alpine
Synonyms: Phleum commutatum var. americanum Phleum commutatum Phleum alpinum var. commutatum Phleum alpinum subsp. commutatum
Treatment appears in FNA Volume 24. Treatment on page 672.

Plants perennial; cespitose, sometimes shortly rhizomatous. Culms 15-50 cm, often decum¬bent, lower internodes not en¬larged or bulbous. Sheaths of the flag leaves inflated; auricles not developed, leaf edges sometimes wrinkled at the junction of the sheath and blade; ligules 1-4 mm, truncate; blades to 17 cm long, 4-7 mm wide, flat. Panicles 1-6 cm long, 5-12 mm wide, usually 1.5-3 times as long as wide, subglobose to broadly cylindric, not tapering distally; branches adnate to the rachises. Glumes 2.5-4.5 mm, sides scabrous, keels hispid, apices awned, awns 0.8-2.5 (3.2) mm; lemmas 1.7-2.5 mm, about 3/4 as long as the glumes, mostly glabrous, keels hairy, hairs to 0.1 mm; anthers 1-1.5 (2) mm. 2n = 14, 28.

Distribution

Maine, N.H., Colo., N.Mex., Wash., Utah, Alaska, Mich., Idaho, Mont., S.Dak., Wyo., Ariz., Alta., B.C., Greenland, N.B., Nfld. and Labr., N.S., N.W.T., Ont., Que., Sask., Yukon, Calif., Nev., Oreg.

Discussion

Phleum alpinum grows along stream banks, on moist prairie hillsides, and in wet mountain meadows. It is a circumboreal species extending, in the Flora region, from northern North America southward through the mountains to Mexico and South America. It is also widespread in northern Eurasia. Isolated, depauperate plants of P. pratense may be difficult to distinguish from P. alpinum; there is never any difficulty in the field.

Kula et al. (2006) demonstrated that American and northern European plants of Phleum alpinum belong to the same taxon. They mistakenly identified the taxon as P. commutatum Gaudin. Because Humphries (1978) lectotypified P. alpinum on a plant from Lapland, it has priority over P. commutatum. North American plants belong to P. alpinum L. subsp. alpinum and are tetraploid. The count of 2n =14 applies to Phleum alpinum subsp. rhaeticum Humphries, which grows in the mountains of central and southern Europe.

Selected References

None.

Lower Taxa

None.

"decumbent" is not a number.

... more about "Phleum alpinum"
membranous +  and scarious +
2 cm20 mm <br />0.02 m <br /> (?) +
0.1 cm1 mm <br />0.001 m <br /> (0.15 cm1.5 mm <br />0.0015 m <br />) +
Acute (?) +, Awnlike (?) +, Truncate (?) +  and Tapered (?) +
Mary E. Barkworth +
1 (?) +  and 3 (?) +
3.2 cm32 mm <br />0.032 m <br /> (?) +
straight +
basal +  and terminal +
0.08 cm0.8 mm <br />8.0e-4 m <br /> (0.25 cm2.5 mm <br />0.0025 m <br />) +
keeled +  and rounded +
pseudopetiolate +  and branching +
not connate +
intravaginal +, extravaginal +, branching +  and basal +
keeled +, cuneate +  and u--shaped +
swelling +
0 cm0 mm <br />0 m <br /> (17 cm170 mm <br />0.17 m <br />) +
not evident +
cross +, linear +  and narrowly lanceolate +
4mm;7mm +
spikelike +
Alpine timothy +, Fléole alpine +  and Phléole alpine +
not branching +
decumbent +  and erect +
15 cm150 mm <br />0.15 m <br /> (50 cm500 mm <br />0.5 m <br />) +
not woody +
Maine +, N.H. +, Colo. +, N.Mex. +, Wash. +, Utah +, Alaska +, Mich. +, Idaho +, Mont. +, S.Dak. +, Wyo. +, Ariz. +, Alta. +, B.C. +, Greenland +, N.B. +, Nfld. and Labr. +, N.S. +, N.W.T. +, Ont. +, Que. +, Sask. +, Yukon +, Calif. +, Nev. +  and Oreg. +
1/6 +  and 1/4 +
liquid +, soft +  and hard +
capillary +
pistillate +  and staminate +
sometimes longer +
sterile +  and bisexual +
compressed +
reduced +
subtending +
unequal +
0.25 cm2.5 mm <br />0.0025 m <br /> (0.45 cm4.5 mm <br />0.0045 m <br />) +
uncinate +
0 cm0 mm <br />0 m <br /> (0.01 cm0.1 mm <br />1.0e-4 m <br />) +
hairy +  and hispid +
not keeled +
0.17 cm1.7 mm <br />0.0017 m <br /> (0.25 cm2.5 mm <br />0.0025 m <br />) +
0.1 cm1 mm <br />0.001 m <br /> (0.4 cm4 mm <br />0.004 m <br />) +
membranous +
inconspicuous +
concealed +  and prominent +
2 +  and 1 +
well-developed +
2-keeled +
subequal +
1cm +  and 6cm +
tapering +, subglobose +  and broadly cylindric +
0.5 cm5 mm <br />0.005 m <br /> (1.2 cm12 mm <br />0.012 m <br />) +
1 cm10 mm <br />0.01 m <br /> (?) +
dry +  and fleshy +
inflated +
1 +  and 60 +
compressed +
0.07 cm0.7 mm <br />7.0e-4 m <br /> (5 cm50 mm <br />0.05 m <br />) +
1 (?) +  and 3 (?) +
simple +  and compound +
2 (?) +  and 3 (?) +
Phleum commutatum var. americanum +, Phleum commutatum +, Phleum alpinum var. commutatum +  and Phleum alpinum subsp. commutatum +
Phleum alpinum +
species +
membranous +
parallel +  and converging +
plant +  and cespitose +
aquatic +  and terrestrial +