Taxon Details

Chlorogalum grandiflorum

Red Hills soaproot

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Taxon Summary:

Chlorogalum grandiflorum, commonly known as Red Hills soaproot, is a perennial bulbiferous herb in the Agavaceae that is found only in California. It occurs within Chaparral, Cismontane woodland, and Lower montane coniferous forest, growing at elevations from 245 to 1690 meters. Chlorogalum grandiflorum is ranked 1B.2, Plants Rare, Threatened or Endangered in California and Elsewhere; Moderately threatened in California.

Classification

Scientific Name: Chlorogalum grandiflorum Hoov.
Common Name: Red Hills soaproot
Family:	Agavaceae
Element Code:	PMLIL0G020
USDA Plants Symbol:	CHGR3
Synonyms/Other Names:
Name Status:	JEF, FNA, POWO, IPNI, Tropicos

Conservation Status

CA Rare Plant Rank:	1B.2
Fed List:	None
State List:	None
Global Rank:	G3
State Rank:	S3
Other Status:	BLM_S; SB_SBBG
CRPR Changes:
Add Date:	1974-01-01
Date Edited:	2025-06-03

Ecology and Life History

Lifeform: perennial bulbiferous herb

Blooming Period: (Apr)May-Jun

Elevation:
245 - 1690 meters
805 - 5545 feet

General Habitats:

Chaparral
Cismontane woodland
Lower montane coniferous forest

Microhabitat Details: other soils

Microhabitat:

Gabbroic
Serpentine

Notes

Notes:
Threats: Threatened by development, mining, road construction, and vehicles. Possibly threatened by trail maintenance, logging and non-native plants.
Taxonomy: See Leaflets of Western Botany 2(8):128 (1938) for original description.

Threat List Data from the CNDDB

THREAT LIST:
Threat List Total:	15
	Total EOs	% of EOs
EOs with Threat Listed:	68	50 %
Logging	31	22%
Road/trail construction/maint.	25	18%
Other	17	12%
Development	11	8%
Non-native plant impacts	10	7%
ORV activity	4	2%
Mining	4	2%
Biocides	4	2%
Grazing	4	2%
Vandalism/dumping/litter	3	2%
Wood cutting or brush clearing	3	2%
Erosion/runoff	2	1%
Foot traffic/trampling	2	1%
Disking	1	0%
Recreational use (non-ORV)	1	0%

Occurrence Data from the CNDDB

Element Occurrence Ranks:
Total Occurrences:					137
A	B	C	D	X	U
7	41	19	5	0	65

Occurrence Status:
Historical >20 Years	45
Recent <=20 Years	92

Presence:
Presumed Extant	137
Possibly Extirpated	0
Presumed Extirpated	0

Location

California Endemic:

California Island:

States: Name (Code)
California (CA)

California Counties and Islands: Name (Code)
Amador (AMA), Calaveras (CAL), El Dorado (ELD), Placer (PLA), Tuolumne (TUO)

Quads: Name (Quad Code)
Aukum (3812056), Chinese Camp (3712074), Clarksville (3812161), Colfax (3912018), Coloma (3812078), Devil Peak (3812085), Devils Nose (3812044), Dorrington (3812033), Foresthill (3912017), Fort Mountain (3812034), Garden Valley (3812077), Georgetown (3812087), Greek Store (3912015), Greenwood (3812088), Michigan Bluff (3912016), New Melones Dam (3712085), Omo Ranch (3812055), Pilot Hill (3812171), Pine Grove (3812046), Pollock Pines (3812075), Rail Road Flat (3812035), Riverton (3812074), Robbs Peak (3812084), Salt Spring Valley (3812016), Shingle Springs (3812068), Slate Mtn. (3812076), Sonora (3712084), Tunnel Hill (3812086), West Point (3812045)

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