HYPP-A Unité de Malherbologie & Agronomie
Weed Science & Agronomy
INRA-Dijon

Bayer Code : poaan

Scientific name: Poa annua L.

Synonym(s) of Sc. name:

Classification: Gramineae, Monocotyledonous

Common name: annual meadow-grass

Synonym(s) of Common name:

Name per country: DE : Einjähriges Rispengras ; ES : poa ; FR : pâturin annuel ; IT : fienarola annuale ; PT : cabelo-de-cao ; EN : annual meadow-grass ; NL : straatgras, NL : tuin(tjes)gras ; DK : enarig rapgræs

Biological type: Annual

Seed snapshot Seed:

.

Seedling snapshot Seedling:

- Shoot folded, leaf sheath flattened.

- Leaf blade 20-50 times longer than wide, leaf glabrous.

- Ligule membranous, truncate, auricles absent.

Adult plant snapshotAdult plant snapshot Adult plant:

- Height: 5-30 cm. Plant tufted. Very variable in forms.

- Leaf with a dull sometimes shining blade, glabrous, smooth with 2 parallel furrows near the midvein. Hooded tip. Parallel-margined blade contracted into a beak. Sheath glabrous, flattened and keeled.

- Inflorescence in a pyramidal panicle, sometimes unilateral with spreading or deflexed branches. Spikelets small, many-flowered. Floral glumes awnless, 5-veined, sparsely hairy.

- Populations exist which are resistant to triazines in France, Switzerland, Germany, Great-Britain, Belgium, Holland, Japan, Austria, Czechoslovakie, U.S.A. Some populations are resistant to paraquat in Great-Britain.

- Biological type: annual.

Mistake with: Poa infirma , Poa trivialis

Ecological profile (click on flags): BeneLux   Present     Germany  Present     Denmark  Present     Spain  Present     France  Present     Great Britain Present    Italy  Present     Portugal  Present    

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