Arctagrostis

Griseb.
Treatment appears in FNA Volume 24. Treatment on page 676.

Plants perennial; rhizomatous. Culms 10-150 cm, erect, glabrous. Sheaths usually closed for up to 1/5 their length; auricles absent; ligules membranous, obtuse, erose or lacerate; blades usually flat, glabrous, scabrous. Inflorescences terminal panicles, loose and open to narrow and contracted; branches 0.5-27 cm, scabridulous. Spikelets 3-6.5 mm, pedicellate, laterally compressed, usually with 1 floret, rarely with 2; rachillas hairy or scabrous, sometimes prolonged beyond the base of the single floret or terminating in a well-formed or vestigial floret; disarticulation above the glumes, beneath the floret (s). Glumes usually shorter than the lemmas, upper glumes sometimes equaling the lemma (s), ovate to lanceolate, glabrous, sometimes scabridulous, 1-3-veined, acute to obtuse, unawned; calluses weakly developed, glabrous; lemmas scabrous or puberulent, 3-5-veined, lateral-veins sometimes obscure, not reaching the apices, apices obtuse to acute, sometimes mucronate, unawned; paleas about as long as the lemmas, folded along 1 prominent vein, the second vein faint; lodicules 2, glabrous; anthers 3; ovaries glabrous. Caryopses 1.7-3 mm, shorter than the lemmas, concealed at maturity; hila 1/4-1/3 the length of the caryopses. x = 7.

Distribution

Alta., B.C., Greenland, Nfld. and Labr. (Nfld.), Man., N.W.T., Nunavut, Ont., Que., Yukon, Alaska

Discussion

Arctagrostis is a circumpolar genus with one species and two subspecies.

"decumbent" is not a number.

... more about "Arctagrostis"
membranous +  and scarious +
Mucronate (?) +, Obtuse (?) +  and Acute (?) +
Susan G. Aiken +
Griseb. +
1 (?) +  and 3 (?) +
straight +
basal +  and terminal +
keeled +  and rounded +
pseudopetiolate +  and branching +
intravaginal +, extravaginal +, branching +  and basal +
swelling +
not evident +
cross +, linear +  and narrowly lanceolate +
scabridulous +
spikelike +
not branching +
10 cm100 mm <br />0.1 m <br /> (150 cm1,500 mm <br />1.5 m <br />) +
not woody +
Alta. +, B.C. +, Greenland +, Nfld. and Labr. (Nfld.) +, Man. +, N.W.T. +, Nunavut +, Ont. +, Que. +, Yukon +  and Alaska +
1/4 +  and 1/3 +
liquid +, soft +  and hard +
capillary +
sometimes longer +
single +, 2 +  and 1 +
sterile +  and bisexual +
compressed +
reduced +
shorter or longer +
subtending +
unequal +
uncinate +
1/4 +  and 1/3 +
puberulent +  and scabrous +
lanceolate +  and ovate +
lacerate +  and obtuse +
membranous +
inconspicuous +
lanceolate +
concealed +  and prominent +
2 +  and 1 +
well-developed +
2-keeled +
spikelike +
dry +  and fleshy +
scabrous +  and hairy +
aiken1990b +, aiken1994a +, aiken1995a +  and mitchell1992a +
1 +  and 60 +
compressed +
0.3 cm3 mm <br />0.003 m <br /> (0.65 cm6.5 mm <br />0.0065 m <br />) +
1 (?) +  and 3 (?) +
simple +  and compound +
2 (?) +  and 3 (?) +
Gramineae +
Arctagrostis +
Poaceae tribe Poeae +
membranous +
scabridulous +
acute +  and obtuse +
parallel +  and converging +
faint +  and prominent +
aquatic +  and terrestrial +