Species Details

Calochortus clavatus var. gracilis

slender mariposa-lily

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Species Description:

Calochortus clavatus var. gracilis, commonly known as slender mariposa-lily, is a perennial bulbiferous herb in the Liliaceae that is found only in California. It occurs within Chaparral, Coastal scrub, and Valley and foothill grassland, growing at elevations from 320 to 1000 meters. Calochortus clavatus var. gracilis is ranked 1B.2, Plants Rare, Threatened or Endangered in California and Elsewhere; Moderately threatened in California.

Classification

Scientific Name: Calochortus clavatus Wats. var. gracilis Ownbey
Common Name: slender mariposa-lily
Family:	Liliaceae
Element Code:	PMLIL0D096
USDA Plants Symbol:	CACLG
Synonyms/Other Names:
Name Status:	JEP, FNA, POWO, IPNI, Tropicos

Conservation Status

CA Rare Plant Rank:	1B.2
Fed List:	None
State List:	None
Global Rank:	G4T2T3
State Rank:	S2S3
Other Status:	BLM_S; SB_CalBG/RSABG; USFS_S
CRPR Changes:
Add Date:	1994-01-01
Date Edited:	2024-11-05

Ecology and Life History

Lifeform: perennial bulbiferous herb

Blooming Period: Mar-Jun(Nov)

Elevation:
320 - 1000 meters
1050 - 3280 feet

General Habitats:

Chaparral
Coastal scrub
Valley and foothill grassland

Microhabitat Details:

Microhabitat:

Notes

Notes: Threatened by development, mining, non-native plants, and vehicles. Possibly threatened by foot traffic. See Annals of the Missouri Botanical Garden 27(4):371-561 (1940) for original description.
Threats:
Taxonomy:

Threat List Data from the CNDDB

THREAT LIST:
Threat List Total:	14
	Total EOs	% of EOs
EOs with Threat Listed:	73	51 %
Development	40	27%
Other	16	11%
Recreational use (non-ORV)	8	5%
Road/trail construction/maint.	8	5%
ORV activity	4	2%
Non-native plant impacts	3	2%
Foot traffic/trampling	2	1%
Grazing	2	1%
Improper burning regime	1	0%
Landfill	1	0%
Mining	1	0%
Altered flood/tidal/hydrologic regime	1	0%
Over-collecting/poaching	1	0%
Wood cutting or brush clearing	1	0%

Occurrence Data from the CNDDB

Element Occurrence Ranks:
Total Occurrences:					143
A	B	C	D	X	U
7	33	28	9	3	63

Occurrence Status:
Historical >20 Years	27
Recent <=20 Years	116

Presence:
Presumed Extant	140
Possibly Extirpated	0
Presumed Extirpated	3

Location

California Endemic:

California Island:

States: Name (Code)
California (CA)

California Counties and Islands: Name (Code)
Los Angeles (LAX), Ventura (VEN)

Quads: Name (Quad Code)
Agua Dulce (3411843), Azusa (3411728), Black Mtn. (3411867), Burbank (3411823), Calabasas (3411826), Camarillo (3411921), Crystal Lake (3411737), Green Valley (3411854), Lake Hughes (3411864), Liebre Mtn. (3411866), Malibu Beach (3411816), Mint Canyon (3411844), Mount San Antonio (3411736), Mt. Baldy (3411726), Newhall (3411845), Oat Mountain (3411835), Piru (3411847), Point Dume (3411817), San Fernando (3411834), Santa Susana (3411836), Sleepy Valley (3411853), Thousand Oaks (3411827), Topanga (3411815), Val Verde (3411846), Warm Springs Mountain (3411855), Whitaker Peak (3411856)

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