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Annual; culms 3–40 cm. high, loosely tufted or solitary, erect or geniculate.. Leaf-blades filiform or subsetaceous, mostly 1–5 cm. long and up to 1 mm. wide; ligule up to 5 mm. long, becoming lacerate.. Panicle loose, ovate to oblong, 1–12 cm. long; branches bare at the base, the spikelets in little clusters towards the tips; pedicels 3/4–3 1/2 times as long as the spikelet, pear-shaped at the tip.. Glumes ovate, 2.3–3.5 mm. long (1.8–2.7 mm. in Flora area), acute (but often obtuse in Flora area); lemmas narrowly ovate, 1.2–1.7 mm. long, scaberulous above, acuminately bilobed, with a geniculate awn 2–3 mm. long arising from below the middle, or rarely the lower floret awnless; callus bearded (but usually glabrous or with sparse short hairs in Flora area).. Fig. 29, p. 85.
Culms solitary or tufted, erect or slightly geniculate, very slender, 5–30 cm tall, scabrid. Leaf sheaths scaberulous; leaf blades narrowly linear to filiform, 1–5 cm, 2–3 mm wide; ligule lanceolate, 1–4 mm, acute becoming lacerate. Panicle open, ovate in outline, up to 10 cm; branches 2–5 cm, capillary, scabrid, bearing spikelets in clusters toward tips; pedicels 2–4 mm, up to twice spikelet length, a pear-shaped swelling below spike-let. Spikelets ovate-oblong in outline, 2–3.5 mm, shining, silvery-gray or tinged purplish; glumes as long as spikelet, keel scaberulous; florets both awned; lemmas brown, 3/4 length of glumes, scabrid, narrowed to 2-toothed apex; awn 2.5–4 mm, arising from lower 1/3 of lemma. Anthers 0.3–0.6 mm.
Culms very slender, smooth, 1–3 dm; sheaths and filiform blades scaberulous; infl lax, pyramidal, nearly as broad as long, with ascending branches; pedicels mostly 1–2 times as long as the spikelets; glumes 2.3–3 mm; lemmas 1.8–2.3 mm, both awned, the awn 2.4–3.3 mm; 2n=28. Native of Europe, intr. in dry soil in open places from Vt. and Mass. to Fla. and Tex., mostly near the coast.
Panicle 0.9-7.5 cm. long, ovate to oblong or obovate in outline, erect, somewhat contracted or open and loose; rhachis filiform, glabrous, smooth, branches paired or rarely solitary, bearing spikelets in the upper 1/2, very slender, almost capillary.
Leaf-laminae 2-7 x 0.02-0.06 cm., filiform, subsetaceous, almost always convolute, usually erect, rarely spreading, scaberulous along the nerves on both surfaces and along the margins, glabrous.
Lemmas 1.75-2.5 mm. long (excluding the awn), ovate-lanceolate with the apex acute to subobtuse, dorsally asperulous towards the apex; awn 3-4 mm. long, usually brown; callus appressed-pilose.
Leaf-sheaths slightly longer or slightly shorter than the internodes, striate, tight at first later loose and slipping off the culm, scaberulous along the nerves.
Spikelets 2.5-4.5 mm. long, ovate to broadly oblong in lateral view, pallid green or silvery-grey, sometimes tinged with purple, slightly glossy.
Culms 5-30 cm. tall, 1-many-noded, rather slender, almost filiform, erect or ascending from a geniculate base, smooth, glabrous.
Ligule up to 4 mm. long, lanceolate-oblong or triangular-oblong, acute to subobtuse, often lacerate.
Glumes 2.75-4.5 mm. long, broadly lanceolate, minutely scaberulous along the keel.
See Aira caryophyllea L. subsp. caryophyllea.
A delicate loosely caespitose annual.
Pedicels 2-10 mm. long, capillary.
Slender annual 5–30 cm. high.
Caryopsis c. 1 mm. long.
Anthers c. 0.3 mm. long.
