Taxon Report

Iris longipetala Herbert

coast iris

Print Report


© 2014 Aaron Schusteff

Taxon Summary

Iris longipetala, commonly known as coast iris, is a perennial rhizomatous herb in the Iridaceae that is found only in California. It occurs within Coastal prairie, Lower montane coniferous forest, and Meadows and seeps, growing at elevations from 0 to 600 meters. Iris longipetala is ranked 4.2, Plants of Limited Distribution, A Watch List; Moderately threatened in California.

  Classification
Scientific Name:
 Iris longipetala Herbert
Common Name:
 coast iris
Family: Iridaceae
Element Code: PMIRI092E0
USDA Plants Symbol:
Synonyms/Other Names:

Ecology and Life History
Lifeform: perennial rhizomatous herb
Blooming Period: Mar-May(Jun) Mar-May(Jun)
Elevation: 0-600 (0-1970)
General Habitats: Coastal prairie, Lower montane coniferous forest, Meadows and seeps
Microhabitat: Mesic
Microhabitat Details:

Conservation Status
CA Rare Plant Rank: 4.2
Global Rank: G3
State Rank:
 S3
State List: None
Fed List: None
Other Status: SB_UCSC
CRPR Changes:
  • added to 4.2 on 2006-10-12

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

Location
California Endemic:  True
California Counties and Islands: Name (Code)
Alameda (ALA), Contra Costa (CCA), El Dorado (ELD), Glenn (GLE), Humboldt (HUM), Marin (MRN), Mendocino (MEN), Merced (MER), Monterey (MNT), San Francisco (SFO), San Mateo (SMT), Santa Clara (SCL), Santa Cruz (SCR), Solano (SOL), Sonoma (SON), Ventura (VEN)
Quads: Name (Quad Code)
Ano Nuevo (3712213), Big Basin (3712222), Briones Valley (3712282), Camp Meeker (3812248), Cape San Martin (3512184), Clarksville (3812161), Cloverdale (3812371), Cooskie Creek (4012423), Cordelia (3812222), Cotati (3812236), Cupertino (3712231), Drakes Bay (3812218), Duncans Mills (3812341), Fairfield South (3812221), Felton (3712211), Franklin Point (3712223), Frazier Mtn. (3411878), Glen Ellen (3812235), Gualala (3812375), Half Moon Bay (3712244), Hopland (3812381)?, Inglenook (3912357), Kenwood (3812245), Lick Observatory (3712136), Mariposa Peak (3612182), Montara Mountain (3712254), Monterey (3612158), Novato (3812215), Palo Alto (3712242), Petaluma River (3812225), Pigeon Point (3712224), Plantation (3812353), Plaskett Meadows (3912267), Plaskett Ridge (3912268), Prunedale (3612176), Richmond (3712283), San Francisco North (3712274), San Francisco South (3712264), San Geronimo (3812216), San Jose East (3712137), San Juan Bautista (3612175), San Mateo (3712253), San Quentin (3712284), San Rafael (3712285), Sebastopol (3812247), Tomales (3812228), Two Rock (3812237), Watsonville East (3612186), Woodside (3712243)

Threat List Data from the CNDDB

Threat List Total: 0
EOs with Threat Listed: Total EOs % of EOs
0 0 %

Notes
Many collections old; need field surveys. May hybridize with Iris missouriensis. Threatened by development and trampling.
Threats:
Taxonomy:

Selected References

CRPR List Addition on 2006-10-12
Citation California Native Plant Society, Rare Plant Program. 2025. Rare Plant Inventory (online edition, v9.5.1). Website https://www.rareplants.cnps.org [accessed 3 March 2025].