Arrhenatherum

P. Beauv.
Treatment appears in FNA Volume 24. Treatment on page 740.
Plants perennial; cespitose, sometimes rhizomatous. Culms 30-200 cm, basal internodes occasionally globose. Sheaths open, not overlapping; auricles absent; ligules membranous, sometimes ciliate; blades flat or convolute. Inflorescences terminal, narrow panicles; branches spreading until after anthesis, then becoming loosely appressed to the rachises. Spikelets pedicellate, laterally compressed, with 2 florets, lower florets staminate, upper florets pistillate or bisexual, a rudimentary floret occasionally present distally; rachillas pubescent; disarticulation above the glumes, the florets usually falling together, rarely falling separately. Glumes unequal, hyaline, unawned; lower glumes less than 3/4 the length of the upper glumes, 1- or 3-veined; upper glumes 3-veined; calluses short, blunt, pubescent; lower lemmas membranous, 3-7-veined, acute, awned below midlength, awns twisted and geniculate; upper lemmas membranous to subcoriacous, glabrous or hairy, 7-veined, acute, usually unawned, sometimes awned from near the apices, awns short, straight, rarely awned similarly to the lower lemmas; paleas subequal to the lemmas, 2-veined, 2-keeled, keels scabrous or hairy, apices notched; lodicules 2, free, linear, membranous, glabrous, entire; anthers 3, 3.4-6.5 mm; ovaries pubescent. Caryopses shorter than the lemmas, concealed at maturity, not grooved, dorsally compressed to terete, hairy; hila long-linear, x = 7.

Distribution

Distribution values could not be resolved to valid regions

Conn., N.J., N.Y., Wash., Del., D.C, Wis., W.Va., Pacific Islands (Hawaii), Mass., Maine, N.H., R.I., Vt., B.C., N.B., Nfld. And Labr. (Labr.), N.S., Ont., Que., Wyo., N.Mex., La., N.C., Nebr., Tenn., Pa., Calif., Nev., Va., Colo., Md., Alaska, Ala., Ark., Ill., Ga., Ind., Iowa, Ariz., Idaho, Mont., Oreg., Ohio, Utah, Mo., Minn., Mich., Kans., Miss., S.Dak., Ky.

Discussion

Arrhenatherum is a Mediterranean and eastern Asian genus of six species; one has become established in North America.

Lower Taxa

Facts about "Arrhenatherum"
AuthorStephan L. Hatch +
AuthorityP. Beauv. +
DistributionConn. +, N.J. +, N.Y. +, Wash. +, Del. +, D.C +, Wis. +, W.Va. +, Pacific Islands (Hawaii) +, Mass. +, Maine +, N.H. +, R.I. +, Vt. +, B.C. +, N.B. +, Nfld. And Labr. (Labr.) +, N.S. +, Ont. +, Que. +, Wyo. +, N.Mex. +, La. +, N.C. +, Nebr. +, Tenn. +, Pa. +, Calif. +, Nev. +, Va. +, Colo. +, Md. +, Alaska +, Ala. +, Ark. +, Ill. +, Ga. +, Ind. +, Iowa +, Ariz. +, Idaho +, Mont. +, Oreg. +, Ohio +, Utah +, Mo. +, Minn. +, Mich. +, Kans. +, Miss. +, S.Dak. + and Ky. +
Referencebrandenburg1985a +
Source xmlhttps://jpend@bitbucket.org/aafc-mbb/fna-data-curation.git/src/f50eec43f223ca0e34566be0b046453a0960e173/coarse grained fna xml/V24/V24 1051.xml +
SynonymsGramineae +
Taxon familyPoaceae +
Taxon nameArrhenatherum +
Taxon parentPoaceae tribe Poeae +
Taxon rankgenus +
VolumeVolume 24 +