Taxon Report

Chlorogalum grandiflorum Hoov.

Red Hills soaproot

Print Report


  Classification
Scientific Name:
 Chlorogalum grandiflorum Hoov.
Common Name:
 Red Hills soaproot
Family: Agavaceae
Element Code: PMLIL0G020
USDA Plants Symbol: CHGR3
Synonyms/Other Names:

Ecology and Life History
Lifeform: perennial bulbiferous herb
Blooming Period: (Apr)May-Jun (Apr)May-Jun
Elevation: 245-1690 (805-5545)
General Habitats: Chaparral, Cismontane woodland, Lower montane coniferous forest
Microhabitat: Gabbroic, Serpentine
Microhabitat Details: other soils

Conservation Status
CA Rare Plant Rank: 1B.2
Global Rank: G3
State Rank:
 S3
State List: None
Fed List: None
Other Status: BLM_S; SB_SBBG
CRPR Changes:

Occurrence Data from the CNDDB
Total Occurrences: 137
Element Occurrence Ranks:
   Excellent (A) 7
   Good (B) 41
   Fair (C) 19
   Poor (D) 5
   None (X) 0
   Unknown (U) 65

Location
California Endemic:  True
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)

Threat List Data from the CNDDB

Threat List Total: 15
EOs with Threat Listed: Total EOs % of EOs
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%

Notes
Threatened by development, mining, road construction, and vehicles. Possibly threatened by trail maintenance, logging and non-native plants. See Leaflets of Western Botany 2(8):128 (1938) 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 8 January 2025].