Poaceae

Pooideae
Aveneae
Agrostis
Aira
Alopecurus
Anthoxanthum
Avena
Cinna
Holcus
Koeleria
Limnodea
Phalaris
Phleum
Polypogon
Rostraria
Sphenopholis
Bromeae
Hainardieae
Meliceae
Poeae
Stipeae
Triticeae
Chloridoideae

Panicoideae

Arundinoideae

Bambusoideae

Home

Inflorescences

Dissections:
Aira caryophyllea

Line drawings

AIRA L. Hairgrass
Plants hermaphroditic, caespitose, annual. Culms erect or ascending (delicate), glabrous to scabrous; internodes hollow, terete. Leaves basal, not distinctly distichous; sheaths terete, margins open; auricles absent; ligules membranous; blades flat (narrow to filiform) or folded, lax. Panicles open or contracted; primary branches spreading or ascending. Spikelets solitary, laterally compressed, disarticulation above glumes; awned, pedicellate; florets 2, reduced floret absent, callus hairy, rachilla extending beyond upper floret or not extended above upper floret; glumes 1-(occasionally 3-) veined, nearly equal, longer than florets, glabrous or scabrous, awnless; lemmas 5-veined, membranous or chartaceous, scabrous, apex bifid, lower lemma awnless, upper lemma with a geniculate dorsal awn; paleas present, 2-veined, awnless. Stamens 3; anthers yellow. Caryopses small, fusiform, dorsiventrally compressed. Base chromosome number x=7.

A genus of about 10 species that were native to Europe. These taxa are from mesic to xeric sites where they are frequently adventive.