''Poa infirma'' is a species of

grass Poaceae ( ), also called Gramineae ( ), is a large and nearly ubiquitous family (biology), family of monocotyledonous flowering plants commonly known as grasses. It includes the cereal grasses, bamboos, the grasses of natural grassland and spe ...

known by the common names early meadow-grass and weak bluegrass. It was first described from a specimen found in

Colombia Colombia, officially the Republic of Colombia, is a country primarily located in South America with Insular region of Colombia, insular regions in North America. The Colombian mainland is bordered by the Caribbean Sea to the north, Venezuel ...

, but it is actually an

introduced species An introduced species, alien species, exotic species, adventive species, immigrant species, foreign species, non-indigenous species, or non-native species is a species living outside its native distributional range, but which has arrived ther ...

in the Americas and is native to Europe.Grass Manual Treatment
/ref> It grows in many types of habitat, including disturbed areas. It is very similar to ''

Poa annua ''Poa annua'', or annual meadow grass (known in America more commonly as annual bluegrass or simply poa), is a widespread low-growing turfgrass in temperate climates. Notwithstanding the reference to annual plant in its name, perennial bio-types ...

'', which is probably a daughter species, and it is often mistaken for ''P. annua'' unless it is closely examined.Chester, T
Plants of Southern California: ''Poa annua'' and ''P. infirma''
/ref> This is a small, densely tufted annual grass growing up to tall. It has thin, soft-haired, yellow-green leaves. The

inflorescence In botany, an inflorescence is a group or cluster of flowers arranged on a plant's Plant stem, stem that is composed of a main branch or a system of branches. An inflorescence is categorized on the basis of the arrangement of flowers on a mai ...

is a series of branches bearing flattened spikelets which have tufts of curly hairs.

References

External links

Jepson Manual TreatmentUSDA Plants Profile
infirma Flora of Europe Flora of Western Asia Flora of China Grasses of Lebanon {{Pooideae-stub

References

Further reading

External links