Poa infirma
Poa infirma is a species of grass known by the common names early meadow-grass[1] and weak bluegrass. It was first described from a specimen found in Colombia, but it is actually an introduced species in the Americas and is native to Europe.[2] It grows in many types of habitat, including disturbed areas. It is very similar to Poa annua, which is probably a daughter species,[2] and it is often mistaken for P. annua unless it is closely examined.[3]
| Poa infirma | |
|---|---|
 | |
| (A–E Poa annua) F habit, G spikelet, H floret with palea and anthers; drawings from Soreng (2007) | |
Scientific classification  | |
| Kingdom: | Plantae |
| Clade: | Tracheophytes |
| Clade: | Angiosperms |
| Clade: | Monocots |
| Clade: | Commelinids |
| Order: | Poales |
| Family: | Poaceae |
| Subfamily: | Pooideae |
| Genus: | Poa |
| Species: | P. infirma |
| Binomial name | |
| Poa infirma | |
This is a small, densely tufted annual grass growing up to 15 centimeters tall. It has thin, soft-haired, yellow-green leaves. The inflorescence is a series of branches bearing flattened spikelets which have tufts of curly hairs.
References
- "BSBI List 2007". Botanical Society of Britain and Ireland. Archived from the original (xls) on 2015-01-25. Retrieved 2014-10-17.
- Grass Manual Treatment
- Chester, T. Plants of Southern California: Poa annua and P. infirma
Further reading
- Takagi-Arigho, Ray (1994) Poa infirma - Flourishing? ... or Fleeing? BSBI News 65:14-18 (gives details of the plant's status and habitat in southwest England)
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