Taxon Report
Iris hartwegii Baker ssp. columbiana LenzTuolumne iris |
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Taxon Summary
Iris hartwegii ssp. columbiana, commonly known as Tuolumne iris, is a perennial rhizomatous herb in the Iridaceae that is found only in California. It occurs within Cismontane woodland, and Lower montane coniferous forest, growing at elevations from 425 to 1400 meters. Iris hartwegii ssp. columbiana is ranked 1B.2, Plants Rare, Threatened or Endangered in California and Elsewhere; Moderately threatened in California.Classification
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Scientific Name: |
Iris hartwegii Baker ssp. columbiana Lenz |
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Common Name: |
Tuolumne iris |
| Family: | Iridaceae |
| Element Code: | PMIRI090D2 |
| USDA Plants Symbol: | IRHAC |
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Synonyms/Other Names: |
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Ecology and Life History
| Lifeform: | perennial rhizomatous herb |
| Blooming Period: May-Jun | May-Jun |
| Elevation: | 425-1400 (1395-4595) |
| General Habitats: | Cismontane woodland, Lower montane coniferous forest |
| Microhabitat: | |
| Microhabitat Details: |
Conservation Status
| CA Rare Plant Rank: | 1B.2 |
| Global Rank: | G4T1 |
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State Rank: |
S1 |
| State List: | None |
| Fed List: | None |
| Other Status: | BLM_S; USFS_S |
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CRPR Changes: |
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Occurrence Data from the CNDDB
| Total Occurrences: | 3 |
| Element Occurrence Ranks: | |
| Excellent (A) | 0 |
| Good (B) | 1 |
| Fair (C) | 1 |
| Poor (D) | 0 |
| None (X) | 0 |
| Unknown (U) | 1 |
| California Endemic: True | |
| California Counties and Islands: Name (Code) | |
| Tuolumne (TUO) | |
| Quads: Name (Quad Code) | |
| Columbia Se (3812013) | |
Threat List Data from the CNDDB
| Threat List Total: | 2 | |
| EOs with Threat Listed: | Total EOs | % of EOs |
| 3 | 100 % | |
| Road/trail construction/maint. | 2 | 66% |
| ORV activity | 1 | 33% |
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 November 2025].