Taxon Report
Agave shawii Engelm. var. shawiiShaw's agave |
 ©2017 Keir Morse |
Taxon Summary
Agave shawii var. shawii, commonly known as Shaw's agave, is a perennial leaf in the Agavaceae that is found in California and elsewhere. It occurs within Coastal bluff scrub, and Coastal scrub, growing at elevations from 3 to 120 meters. Agave shawii var. shawii is ranked 2B.1, Plants Rare, Threatened, or Endangered in California, But More Common Elsewhere; Seriously threatened in California.Classification
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Scientific Name: |
Agave shawii Engelm. var. shawii |
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Common Name: |
Shaw's agave |
| Family: | Agavaceae |
| Element Code: | PMAGA010P1 |
| USDA Plants Symbol: | |
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Synonyms/Other Names: |
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Ecology and Life History
| Lifeform: | perennial leaf |
| Blooming Period: Sep-May | Sep-May |
| Elevation: | 3-120 (10-395) |
| General Habitats: | Coastal bluff scrub, Coastal scrub |
| Microhabitat: | |
| Microhabitat Details: | Maritime succulent scrub |
Conservation Status
| CA Rare Plant Rank: | 2B.1 |
| Global Rank: | G2G3T2T3 |
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State Rank: |
S1 |
| State List: | None |
| Fed List: | None |
| Other Status: | IUCN_EN; SB_CalBG/RSABG; SB_SBBG |
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CRPR Changes: |
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Occurrence Data from the CNDDB
| Total Occurrences: | 8 |
| Element Occurrence Ranks: | |
| Excellent (A) | 1 |
| Good (B) | 1 |
| Fair (C) | 0 |
| Poor (D) | 2 |
| None (X) | 0 |
| Unknown (U) | 4 |
| California Endemic: False | |
| California Counties and Islands: Name (Code) | |
| San Diego (SDG) | |
| Quads: Name (Quad Code) | |
| Del Mar (3211782), Encinitas (3311713), Imperial Beach (3211751), Point Loma (3211762) | |
Threat List Data from the CNDDB
| Threat List Total: | 9 | |
| EOs with Threat Listed: | Total EOs | % of EOs |
| 5 | 63 % | |
| Foot traffic/trampling | 4 | 50% |
| Erosion/runoff | 3 | 37% |
| Non-native plant impacts | 2 | 25% |
| Other | 2 | 25% |
| Road/trail construction/maint. | 1 | 12% |
| Vandalism/dumping/litter | 1 | 12% |
| Wood cutting or brush clearing | 1 | 12% |
| Development | 1 | 12% |
| Military operations | 1 | 12% |
Notes
| Introduced at several locations, including Cabrillo NM. Seriously threatened by habitat loss, habitat disturbance, development, trampling, genetic isolation, low recruitment, and genetic dilution from introduced plants. Previously threatened by horticultural collecting, but less so in recent years and non-native plants. See Rancho Santa Ana Botanic Garden Occasional Publications 14 (2014) by S.E. Vanderplank for conservation plan. |
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Threats: |
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Taxonomy: |
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 April 2025].