Agrostis hyemalis

(Walter) Britton, Sterns &
Common names: Winter bent Agrostide d'hiver
Synonyms: Agrostis hiemalis
Treatment appears in FNA Volume 24. Treatment on page 647.
Please click on the illustration for a higher resolution version.
Illustrator: Sandy Long

Copyright: Utah State University

Plants perennials or facultative annuals; cespitose, not rhizomatous or stoloniferous. Culms 15-82 cm, erect, with (3) 4-7 nodes. Leaves cauline and basal; sheaths smooth; ligules (0.7) 1.2-4 mm, dorsal surfaces scabrous, apices usually rounded to truncate, sometimes acute, lacerate-erose; blades 3-10 cm long, 1-2 mm wide, flat, becoming involute, or folded. Panicles (5) 10-25 (36) cm long, (3) 4-24 cm wide, broadly ovate, often nearly as wide as long, diffuse, the whole panicle often detaching at the base at maturity, forming a tumbleweed, bases often enclosed by the upper sheaths, lowest node with (3) 5-11 branches; branches scabrous, capillary, flexible, widespreading, branching in the distal 1/4, spikelets strongly clustered at the branch tips, lower branches 5-15 cm; pedicels 0.1-2.5 (3.5) mm. Spikelets ovate to narrowly ovate, greenish or purplish. Glumes subequal, 1-2 mm, 1-veined, keeled, keels scabrous, sometimes the body also scabrous towards the apices, acute to acuminate; callus hairs to 0.2 mm, sparse; lemmas 0.8-1.2 mm, scabridulous, translucent to opaque, 5-veined, veins obscure or prominent distally, apices usually obtuse, sometimes acute, entire, unawned; paleas absent, or to 0.2 mm and thin; anthers 3, 0.2-0.5 mm. Caryopses 0.7-1 mm. 2n = 28.

Distribution

Conn., N.J., N.Y., Del., D.C., Wis., W.Va., Mass., Maine, N.H., R.I., Vt., Fla., Puerto Rico, Tex., La., Tenn., N.C., S.C., Pa., Kans., Nebr., Okla., S.Dak., Va., Ont., Ala., Ark., Ill., Ga., Ind., Iowa, Md., Ohio, Mo., Minn., Mich., Miss., Ky.

Discussion

Agrostis hyemalis is most abundant along roadsides and in open pastures, scrub, and rocky areas. It is centered in the southeastern United States; historically it extended north to coastal Maine, where it may be extinct, west to Wisconsin and Texas, and south into the Caribbean, Mexico, and Ecuador. Records from further north and west in North America are confused; many reflect the former inclusion of the generally more northern A. scabra in A. hyemalis. Agrostis hyemalis differs from A. scabra in its smaller spikelets and anthers, more conspicuous culm leaves, and more clustered spikelets.

Selected References

None.

Lower Taxa

None.

"decumbent" is not a number.

... more about "Agrostis hyemalis"
membranous +  and scarious +
not penicillate +
0.02 cm0.2 mm <br />2.0e-4 m <br /> (0.05 cm0.5 mm <br />5.0e-4 m <br />) +
Acute (?) +, Obtuse (?) +, Usually rounded (?) +  and Truncate (?) +
M.J. Harvey +
(Walter) Britton, Sterns & +
1 (?) +  and 3 (?) +
straight +
basal +  and terminal +
geniculate +
rounded +  and keeled +
pseudopetiolate +  and branching +
intravaginal +, extravaginal +, branching +  and basal +
swelling +
3 cm30 mm <br />0.03 m <br /> (10 cm100 mm <br />0.1 m <br />) +
not evident +
scabridulous +
folded +  and involute +
1mm;2mm +
widespreading +
capillary +
0 cm0 mm <br />0 m <br /> (0.02 cm0.2 mm <br />2.0e-4 m <br />) +
hairy +  and glabrous +
Winter bent +  and Agrostide d'hiver +
not branching +
15 cm150 mm <br />0.15 m <br /> (82 cm820 mm <br />0.82 m <br />) +
not woody +
Conn. +, N.J. +, N.Y. +, Del. +, D.C. +, Wis. +, W.Va. +, Mass. +, Maine +, N.H. +, R.I. +, Vt. +, Fla. +, Puerto Rico +, Tex. +, La. +, Tenn. +, N.C. +, S.C. +, Pa. +, Kans. +, Nebr. +, Okla. +, S.Dak. +, Va. +, Ont. +, Ala. +, Ark. +, Ill. +, Ga. +, Ind. +, Iowa +, Md. +, Ohio +, Mo. +, Minn. +, Mich. +, Miss. +  and Ky. +
1/4 +  and 1/3 +
liquid +, soft +  and hard +
capillary +
pistillate +  and staminate +
sometimes longer +
sterile +  and bisexual +
compressed +
reduced +
(1)1.3-2(4) times longer than +
subtending +
subequal +
0.1 cm1 mm <br />0.001 m <br /> (0.2 cm2 mm <br />0.002 m <br />) +
uncinate +
diffuse +  and dense +
basal +  and cauline +
translucent +  and opaque +
pubescent +  and glabrous +
scabridulous +
lanceolate +  and ovate +
0.08 cm0.8 mm <br />8.0e-4 m <br /> (0.12 cm1.2 mm <br />0.0012 m <br />) +
membranous +
0.12 cm1.2 mm <br />0.0012 m <br /> (0.4 cm4 mm <br />0.004 m <br />) +
membranous +
inconspicuous +
lanceolate +
5 cm50 mm <br />0.05 m <br /> (15 cm150 mm <br />0.15 m <br />) +
0.01 cm0.1 mm <br />1.0e-4 m <br /> (0.03 cm0.3 mm <br />3.0e-4 m <br />) +
concealed +  and prominent +
4 +  and 7 +
2 +  and 1 +
well-developed +
2-keeled +
minute +  and subequal +
0 cm0 mm <br />0 m <br /> (0.02 cm0.2 mm <br />2.0e-4 m <br />) +
10cm +  and 25cm +
4 cm40 mm <br />0.04 m <br /> (24 cm240 mm <br />0.24 m <br />) +
3.5 cm35 mm <br />0.035 m <br /> (?) +
0.01 cm0.1 mm <br />1.0e-4 m <br /> (0.25 cm2.5 mm <br />0.0025 m <br />) +
dry +  and fleshy +
not prolonged +
hairy +  and glabrous +
scabrous +  and scabridulous +
purplish +  and greenish +
1 +  and 60 +
ovate +  and narrowly ovate +
0.12 cm1.2 mm <br />0.0012 m <br /> (0.7 cm7 mm <br />0.007 m <br />) +
1 (?) +  and 3 (?) +
simple +  and compound +
2 (?) +  and 3 (?) +
Agrostis hiemalis +
Agrostis hyemalis +
Agrostis +
species +
membranous +
2 +  and 5 +
not convergent +
prominent +  and obscure +
scabrous +  and scabridulous +
stoloniferous +  and rhizomatous +
plant +  and cespitose +
aquatic +  and terrestrial +