Taxon Details

Poa napensis

Napa blue grass

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Taxon Summary:

Poa napensis, commonly known as Napa blue grass, is a perennial herb in the Poaceae that is found only in California. It occurs within Meadows and seeps, and Valley and foothill grassland, growing at elevations from 100 to 200 meters. Poa napensis is ranked 1B.1, Plants Rare, Threatened or Endangered in California and Elsewhere; Seriously threatened in California.

Classification

Scientific Name: Poa napensis Beetle
Common Name: Napa blue grass
Family:	Poaceae
Element Code:	PMPOA4Z1R0
USDA Plants Symbol:	PONA
Synonyms/Other Names:
Name Status:	JEF, FNA, POWO, IPNI, Tropicos

Conservation Status

CA Rare Plant Rank:	1B.1
Fed List:	FE (1997-10-22)
State List:	CE (1979-07-01)
Global Rank:	G1
State Rank:	S1
Other Status:	SB_CalBG/RSABG
CRPR Changes:
Add Date:	1974-01-01
Date Edited:	2022-06-08

Ecology and Life History

Lifeform: perennial herb

Blooming Period: May-Aug

Elevation:
100 - 200 meters
330 - 655 feet

General Habitats:

Meadows and seeps
Valley and foothill grassland

Microhabitat Details: near thermal springs

Microhabitat:

Alkaline

Notes

Notes: Known from only two occurrences in the Calistoga area. Threatened by development, hydrological alterations, recreational activities, and airport maintenance. See Leaflets of Western Botany 4:289 (1946) for original description.
Threats:
Taxonomy:

Threat List Data from the CNDDB

THREAT LIST:
Threat List Total:	7
	Total EOs	% of EOs
EOs with Threat Listed:	2	100 %
Development	2	100%
Foot traffic/trampling	2	100%
Grazing	1	50%
ORV activity	1	50%
Other	1	50%
Road/trail construction/maint.	1	50%
Surface water diversion	1	50%

Occurrence Data from the CNDDB

Element Occurrence Ranks:
Total Occurrences:					2
A	B	C	D	X	U
0	2	0	0	0	0

Occurrence Status:
Historical >20 Years	0
Recent <=20 Years	2

Presence:
Presumed Extant	2
Possibly Extirpated	0
Presumed Extirpated	0

Location

California Endemic:

California Island:

States: Name (Code)
California (CA)

California Counties and Islands: Name (Code)
Napa (NAP)

Quads: Name (Quad Code)
Calistoga (3812255)

Notes:

Definitions of codes following a county and/or quad:
*		Presumed extirpated
(?)		Occurrence confirmed, but possibly extirpated
Quad and county data is imported from the CNDDB. Species may be present in other areas where conditions are favorable. These data should NOT be substituted for pre-project review or for on-site surveys.

Regional Map

Map

Presumed Extant

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CNPS Rare Plant Inventory