Poa sect. Arenariae

(Hegetschw.) Stapf
Synonyms: Poa sect. Bolbophorum
Treatment appears in FNA Volume 24.

Plants perennial; not rhizomatous, not stoloniferous, densely tufted. Basal branching intravaginal. Culms 2-60 cm, terete, bases bulbous. Sheaths closed for about 1/4 their length, lowest sheaths with swollen bases; ligules 1-6 mm, smooth or scabrous, obtuse to acute; blades (0.5) 1-2.5 mm wide, flat, thin, lax, soon withering. Panicles (0.8) 2-10 cm, ovoid, loosely contracted; nodes with 2-5 branches; branches usually ascending, infrequently spreading, terete, usually smooth or sparsely scabrous, rarely moderately scabrous. Spikelets 3-7 mm, laterally compressed, some or all bulbiferous; florets (2) 3-7, forming a bulblet, sometimes the basal 1-2 florets normal. Glumes shorter than the adjacent lemmas, distinctly keeled, keels scabrous; lower glumes 3-veined; calluses terete or slightly laterally compressed, glabrous or dorsally webbed, hairs wrinkled; lemmas normal or leaflike, normal lemmas 2-4 mm, distinctly keeled, glabrous throughout or the keels and marginal veins villous, intercostal regions glabrous or puberulent, leaflike lemmas thickened at the base, bladelike distally; paleas scabrous, keels often softly puberulent at midlength; anthers 3, (0.6) 1.2-2 mm, sometimes aborted late in development, sometimes not developed.

Discussion

Poa sect. Arenariae is native to Eurasia and North Africa. It includes 14 species. These are easily recognized as members of the section by the bulbous bases of their new shoots. One species is established in the Flora region.

Selected References

None.

Lower Taxa

No values specified."decumbent" is not a number.

... more about "Poa sect. Arenariae"
membranous +  and scarious +
puberulent +, hispidulous +, hairy +  and glabrous +
0.6 cm6 mm <br />0.006 m <br /> (?) +
0.12 cm1.2 mm <br />0.0012 m <br /> (0.2 cm2 mm <br />0.002 m <br />) +
scarious-hyaline +
obtuse +  and acuminate +
Robert J. Soreng +
(Hegetschw.) Stapf +
1 (?) +  and 3 (?) +
straight +
basal +  and terminal +
keeled +  and rounded +
strigose +  and glabrous +
intravaginal +, extravaginal +, branching +  and basal +
swollen +
swelling +
not evident +
involute +, folded +  and flat +
spreading;ascending +
hispidulous +, glabrous +, smooth or +  and sparsely densely scabrous +
0.5 cm5 mm <br />0.005 m <br /> (20 cm200 mm <br />0.2 m <br />) +
webbed +  and glabrous +
compressed +  and terete +
unbranched +  and hollow +
ascending +  and erect +
2 cm20 mm <br />0.02 m <br /> (60 cm600 mm <br />0.6 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 +
3 +  and 7 +
compressed +
reduced +
1-3(5)-veined +
shorter or longer +
subtending +
unequal +
distributed +
wrinkled +
uncinate +
0.1 cm1 mm <br />0.001 m <br /> (?) +
0 +  and 1/6 +
Oval (?) +  and Round (?) +
milky white +  and slightly greenish +
puberulent +  and glabrous +
puberulent +  and villous +
5(7-11)-veined +
bladelike +  and keeled +
0.2 cm2 mm <br />0.002 m <br /> (0.4 cm4 mm <br />0.004 m <br />) +
membranous +
erose +  and entire +
white +  and milky white or hyaline +
ciliolate +  and smooth +
obtuse +  and acute +
0.1 cm1 mm <br />0.001 m <br /> (0.6 cm6 mm <br />0.006 m <br />) +
membranous +
inconspicuous +
lobed +  and lanceolate +
milky white +  and slightly greenish +
glabrous +, scabrous +  and smooth +
concealed +  and prominent +
0 +  and 5 +
2 +  and 1 +
well-developed +
2-keeled +
subequal +
0.8 cm8 mm <br />0.008 m <br /> (?) +
erect +  and nodding +
2 cm20 mm <br />0.02 m <br /> (10 cm100 mm <br />0.1 m <br />) +
dry +  and fleshy +
pubescent +, glabrous +, scabrous +  and smooth +
terete or +  and weakly strongly compressed +
many +, 1 +  and 100 +
compressed +
0.3 cm3 mm <br />0.003 m <br /> (0.7 cm7 mm <br />0.007 m <br />) +
1 +  and 3 +
simple +  and compound +
2 (?) +  and 3 (?) +
Poa sect. Bolbophorum +
Poa sect. Arenariae +
Poa subg. Poa +
section +
membranous +
parallel +  and converging +
branching +, not stoloniferous +  and not rhizomatous +
aquatic +  and terrestrial +