Taxon Report
Chlorogalum grandiflorum Hoov.Red Hills soaproot |
 © 2004 George W. Hartwell |
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
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Scientific Name: |
Chlorogalum grandiflorum Hoov. |
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Common Name: |
Red Hills soaproot |
| Family: | Agavaceae |
| Element Code: | PMLIL0G020 |
| USDA Plants Symbol: | CHGR3 |
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Synonyms/Other Names: |
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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 |
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State Rank: |
S3 |
| State List: | None |
| Fed List: | None |
| Other Status: | BLM_S; SB_SBBG |
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CRPR Changes: |
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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 |
| 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% |
Citation
California Native Plant Society, Rare Plant Program. 2025. Rare Plant Inventory (online edition, v9.5.1). Website https://www.rareplants.cnps.org [accessed 4 June 2025].