Washington Flora Checklist
A Checklist of the Vascular Plants of Washington State
Hosted by the University of Washington Herbarium
 

Checklist » Recent Updates » Poa annua

Poa annua L. [FNA24, H&C]
Poaceae
annual blue grass

Origin: Introduced

Voucher:WTU (view specimen records)

Notes: FNA24: "Poa annua is one of the world’s most widespread weeds. It thrives in anthropomorphic habitats outside of the arctic. A native of Eurasia, it is now well established throughout most of the Flora region.

Poa annua is a gynomonoecious tetraploid (possibly rarely polyhaploid), and is thought to have arisen from hybridization between P. infirma and P. supina (Tutin 1952). It is similar to P. infirma, differing in having larger anthers. It differs from P. chapmaniana in having glabrous calluses and three larger anthers, rather than one. Forms with glabrous lemmas occur sporadically within populations."

Literature:
(none)
Photo © Richard Old
(from WTU Image Collection)

Taxon treatment authored by Michael Marsh, Peter F. Zika; last updated 7/28/2009 by David Giblin
Synonyms
Poa annua L. var. aquatica Aschers.   [FNA24, H&C]
Poa annua L. var. reptans Hausskn.   [FNA24, H&C]




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