Taxon Report

Phacelia monoensis Halse

Mono County phacelia

Print Report

Taxon Summary

Phacelia monoensis, commonly known as Mono County phacelia, is a annual herb in the Hydrophyllaceae that is found in California and elsewhere. It occurs within Great Basin scrub, and Pinyon and juniper woodland, growing at elevations from 1900 to 2900 meters. Phacelia monoensis is ranked 1B.1, Plants Rare, Threatened or Endangered in California and Elsewhere; Seriously threatened in California.

Classification


Scientific Name:	Phacelia monoensis Halse
Common Name:	Mono County phacelia
Family:	Hydrophyllaceae
Element Code:	PDHYD0C4V0
USDA Plants Symbol:	PHMO11
Synonyms/Other Names:

Ecology and Life History


Lifeform:	annual herb
Blooming Period: May-Jul	May-Jul
Elevation:	1900-2900 (6235-9515)
General Habitats:	Great Basin scrub, Pinyon and juniper woodland
Microhabitat:	Clay, Roadsides (often)
Microhabitat Details:

Conservation Status


CA Rare Plant Rank:	1B.1
Global Rank:	G3
State Rank:	S2
State List:	None
Fed List:	None
Other Status:	BLM_S; USFS_S
CRPR Changes:

Occurrence Data from the CNDDB


Total Occurrences:	14
Element Occurrence Ranks:
Excellent (A)	2
Good (B)	5
Fair (C)	2
Poor (D)	0
None (X)	2
Unknown (U)	3

Location


California Endemic: False
California Counties and Islands: Name (Code)
Inyo (INY), Mono (MNO)
Quads: Name (Quad Code)
Aurora (3811838), Big Alkali (3811922), Bridgeport (3811932), Coso Peak (3611726), Dome Hill (3811931), Kirkwood Spring (3811828), Mt. Patterson (3811943)

Threat List Data from the CNDDB


Threat List Total:	8
EOs with Threat Listed:	Total EOs	% of EOs
	10	71 %
Road/trail construction/maint.	8	57%
Grazing	6	42%
ORV activity	4	28%
Other	1	7%
Erosion/runoff	1	7%
Military operations	1	7%
Mining	1	7%
Non-native plant impacts	1	7%

Notes



Known in CA from fewer than twenty occurrences. Threatened by vehicles, grazing, and trampling. Threatened in NV. See Madroño 28(3):124-125 (1981) for original description, and Intermountain Flora 4:177 (1984) for alternate taxonomic treatment.
Threats:

Taxonomy:

Selected References

Citation California Native Plant Society, Rare Plant Program. 2025. Rare Plant Inventory (online edition, v9.5.1). Website https://www.rareplants.cnps.org [accessed 8 November 2025].