Taxon Report

Calochortus palmeri Wats. var. munzii Ownbey

San Jacinto mariposa-lily

Print Report

Taxon Summary

Calochortus palmeri var. munzii, commonly known as San Jacinto mariposa-lily, is a perennial bulbiferous herb in the Liliaceae that is found only in California. It occurs within Chaparral, Lower montane coniferous forest, and Meadows and seeps, growing at elevations from 855 to 2200 meters. Calochortus palmeri var. munzii is ranked 1B.2, Plants Rare, Threatened or Endangered in California and Elsewhere; Moderately threatened in California.

Classification


Scientific Name:	Calochortus palmeri Wats. var. munzii Ownbey
Common Name:	San Jacinto mariposa-lily
Family:	Liliaceae
Element Code:	PMLIL0D121
USDA Plants Symbol:	CAPAM
Synonyms/Other Names:

Ecology and Life History


Lifeform:	perennial bulbiferous herb
Blooming Period: Apr-Jul	Apr-Jul
Elevation:	855-2200 (2805-7220)
General Habitats:	Chaparral, Lower montane coniferous forest, Meadows and seeps
Microhabitat:
Microhabitat Details:

Conservation Status


CA Rare Plant Rank:	1B.2
Global Rank:	G3T3
State Rank:	S3
State List:	None
Fed List:	None
Other Status:	BLM_S; SB_CalBG/RSABG; USFS_S
CRPR Changes:

Occurrence Data from the CNDDB


Total Occurrences:	48
Element Occurrence Ranks:
Excellent (A)	0
Good (B)	1
Fair (C)	1
Poor (D)	0
None (X)	1
Unknown (U)	45

Location


California Endemic: True
California Counties and Islands: Name (Code)
Riverside (RIV), San Diego (SDG)
Quads: Name (Quad Code)
Anza (3311656), Beauty Mountain (3311646), Blackburn Canyon (3311667), Butterfly Peak (3311655), Descanso (3211675), Earthquake Valley (3311614), Idyllwild (3311666), Monument Peak (3211684), Palm View Peak (3311665), Rancho Mirage (3311664), San Jacinto Peak (3311676), Toro Peak (3311654), Warner Springs (3311636), Warners Ranch (3311626)

Threat List Data from the CNDDB


Threat List Total:	7
EOs with Threat Listed:	Total EOs	% of EOs
	10	21 %
Non-native plant impacts	7	14%
Road/trail construction/maint.	5	10%
Grazing	4	8%
Other	2	4%
Wood cutting or brush clearing	1	2%
Foot traffic/trampling	1	2%
ORV activity	1	2%

Notes



Known from only a few occurrences in the San Jacinto Mtns. Possibly threatened by grazing, road maintenance, hydrological alterations, non-native plants, and recreational activities. See Aliso 4:88 (1958) for original description.
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 5 February 2025].