Species Iris Group of North America

What's An Iris? What's SIGNA? Seed Exchange
Publications* Species Database Spec-X IOTM
Upload Info
Upload Photo
Iris tenuis

Botanical Name: Iris tenuis (added by D. Kramb, 08-NOV-03)

Botanical Synonyms:

(, )


Oregonae (Will Plotner, 11-NOV-03 )

Lophiris (D. Kramb, 10-OCT-04)

Common Names:

Clackamas Iris (Will Plotner, 11-NOV-03 )

Chromosome Count:

2n=28 (D. Kramb, 10-OCT-04)

General Description:

Lt. green deciduous leaves 30-35cm long & 1-2cm wide, varing white flowers 3-5cm across (Will Plotner, 11-NOV-03 )

Grows 12"-14" tall with flowers that are white, or marked in blue, with a yellowish crest-like ridge. (D. Kramb, 10-OCT-04)

Distinguishing Features:

Very small wirery Rhizomes run close to the surface of the ground, D shaped seeds (Will Plotner, 11-NOV-03 )

Preferred Habitat:

Afternoon shade in moist leafy soil (Will Plotner, 11-NOV-03 )


Cold hearty, but not heat or dry hardy (Will Plotner, 11-NOV-03 )

Native Range:

Clackamas River, Clackamas County, Oregon (Will Plotner, 11-NOV-03 )

Status in the Wild:

Scattered in the forest of the Clackamas River Drainage system (Will Plotner, 11-NOV-03 )

Commercial Availability:

Yes (Will Plotner, 11-NOV-03 )

Sources Cited:

Info entered on 10-OCT-04 comes from the SIGNA Checklist of Iris Species. (D. Kramb, 10-OCT-04)

Additional Comments:

Grows successfully in eastern MA (Jan Sacks, 13-NOV-03 )

Where to buy it:

Oregon Native Plant Nursery

Pacific Rim Native Plant Nursery

SIGNA member!

© 1999-2020, SIGNA. Material from this database may be freely used for non-profit purposes, provided that you give proper credit to the original photographer or contributor. For-profit organizations should contact the photographer or contributor directly to request permission. SIGNA may or may not have contact information for those individuals. Number of Species: 433, Number of Photos: 2121

© 2024, SIGNA. For general inquiries about SIGNA please contact Rodney Barton. Please report technical problems to dkramb@gmail.com.
* Some important new updates were added January 2024 indicated by the asterisk in the header. Please check them out!