Page author: David Giblin
Idahoa scapigera
flatpod, scalepod

Distribution: Occurring east of the Cascades crest in Washington; British Columbia to California, east to Montana, Idaho, and Nevada.

Habitat: Sagebrush desert.

Flowers: March-April

Origin: Native

Growth Duration: Annual

Conservation Status: Not of concern

Pollination: Bees, flies, butterflies


Small, glabrous, acaulescent annual, the several, leafless scapes 3-13 cm. tall.


Leaves numerous in a basal rosette, with slender petioles 1-3 times as long as the blades; blades ovate, entire to lyrate, 5-15 mm. long.


Flowers solitary on the scapes; sepals 4, spreading, usually reddish or purplish; petals 4, white, equaling the sepals; stamens 5; style almost lacking.


Silicles orbicular to oblong-oval, 6-12 mm. long, strongly compressed.

Accepted Name:
Idahoa scapigera (Hook.) A. Nelson & J.F. Macbr.
Publication: Bot. Gaz. 56: 474. 1913.

Synonyms & Misapplications:
Platyspermum scapigerum Hook.
Additional Resources:

PNW Herbaria: Specimen records of Idahoa scapigera in the Consortium of Pacific Northwest Herbaria database

WA Flora Checklist: Idahoa scapigera checklist entry

OregonFlora: Idahoa scapigera information

E-Flora BC: Idahoa scapigera atlas page

CalPhotos: Idahoa scapigera photos

43 photographs:
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