All Floras      Advanced Search
Login | eFloras Home | Help
Taiwan Gramineae | Family List | Poaceae

Avena L.

燕麥屬

Avena sativa
leaf cross section

Credit: cs kuoh

Annual. Panicle loose, nodding. spikelets large, more than 10 mm, 2-several-flowered, disarticulating below each floret or only above glumes; glumes herbaceous to membranous, usually equal and as long as spikelet, 3-11-nerved, rounded on back, smooth; lemmas coriaceous, rounded, bidentate to biaristulate the latter rarly with 2 additional setae, geniculately awned from the back (awn often reduced or absent in cultivated species); floret callus, when deciduous, acute to pungent. Ovary hairy; hilum linear.

Species ±25. Mainly Mediterranean and Middle East, extending to northern Europe, and widely introduced to other temperate regions.

Weedy places. A. fatua is one of the world’s worst weeds.


KEY TO THE SPECIES

1 Spikelets more than 2 florets; lemmas densely-bearded, mor or less brownish; florets falling off when mature   Avena fatua
+ Spikelets 1-2-florets; lemmas nearly glabrous, greenish; florets persistent.   Avena sativa

Lower Taxa


 

Related Objects  

Flora of China  
  • Avena.pdf
  • PDF

     |  eFlora Home |  People Search  |  Help  |  ActKey  |  Hu Cards  |  Glossary  |