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Poa Napensis or Napa bluegrass is a species of meadow grass

Images of Poa Napensis at

Poa Napensis which is also known as Napa bluegrass is a species of meadow grass.

Overview of Poa Napensis

• Poa napensis is a rare species of grass.
• It is endemic to Napa County in California.
• Here, it occurs in 2 forms near Calistoga.
It grows in:
– moist
– mineral-rich soil
– around hot springs

The rare grass only occurs on:
– private
– unprotected land
– depends on water from the hot springs
– changes to the local water regime
– other aspects of its specific habitat type
• In 1997, this grass was federally listed as an endangered species.
• This is a perennial grass.
• It forms dense clumps.
• The stems are somewhat waxy.
• The stems can grow up to one meter in height.
• The inflorescence is an open array of thin branches.
• They bear spikelets that are rough-haired and flattened.
• These are lance-shaped spikelets.
• The spikelets are greenish to purple in color.
• It is a monocot.
• It belongs to the family Poaceae.
• It is a perennial herb.

It grows in communities like:
• Valley Grassland
• wetland-riparian

It grows in habitat:
• Springs
• Meadows

Lepidoptera whose caterpillars use Poa as its food include:
• Agriphila inquinatella
• Cercyonis pegala
• Poanes hobomok
• Poanes zabulon

Scientific Classification of Poa Napensis

• Kingdom : Plantae
• (unranked) : Angiosperms
• (unranked) : Monocots
• (unranked) : Commelinids
• Order : Poales
• Family : Poaceae
• Subfamily : Pooideae
• Genus : Poa
• Species : P. napensis
• Binomial name : Poa napensis

Growing/Caring conditions

• This is an incredibly easily grown plant.
• It succeeds in well-drained soils.
• It prefers moderately fertile soil.
• It grows well in a sunny position.
• It can tolerate very acid soils.
• This plant is a very common garden weed.
• It usually does not require cultivation.
• This is an essential food plant for the caterpillars of numerous species of butterfly.
• It is seen growing in close cut lawns.
• The seed drops very readily in the plant and hence is difficult to harvest.
• But this way the seed is spread effortlessly.
• It makes the flower even more difficult to eradicate.
• A lot of the species are very important pasture plants.
• They are used extensively by grazing livestock.
• Many of the Poa species are popular for gardens as well as for landscaping in New Zealand.

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