Taxon Details

Iris hartwegii ssp. columbiana

Tuolumne 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

Scientific Name: Iris hartwegii Baker ssp. columbiana Lenz
Common Name: Tuolumne iris
Family:	Iridaceae
Element Code:	PMIRI090D2
USDA Plants Symbol:	IRHAC
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:	G4T1
State Rank:	S1
Other Status:	BLM_S; USFS_S
CRPR Changes:
Add Date:	1980-01-01
Date Edited:	2025-10-29

Ecology and Life History

Lifeform: perennial rhizomatous herb

Blooming Period: May-Jun

Elevation:
425 - 1400 meters
1395 - 4595 feet

General Habitats:

Cismontane woodland
Lower montane coniferous forest

Microhabitat Details:

Microhabitat:

Notes

Notes: Possibly threatened by logging. See Aliso 4(1):37 (1958) for original description.
Threats:
Taxonomy:

Threat List Data from the CNDDB

THREAT LIST:
Threat List Total:	2
	Total EOs	% of EOs
EOs with Threat Listed:	3	100 %
Road/trail construction/maint.	2	66%
ORV activity	1	33%

Occurrence Data from the CNDDB

Element Occurrence Ranks:
Total Occurrences:					3
A	B	C	D	X	U
0	1	1	0	0	1

Occurrence Status:
Historical >20 Years	1
Recent <=20 Years	2

Presence:
Presumed Extant	3
Possibly Extirpated	0
Presumed Extirpated	0

Location

California Endemic:

California Island:

States: Name (Code)
California (CA)

California Counties and Islands: Name (Code)
Tuolumne (TUO)

Quads: Name (Quad Code)
Columbia Se (3812013)

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