Page authors: Don Knoke, David Giblin
Polemonium micranthum
annual Jacob's-ladder, annual polemonium

Distribution: Occurring east of the Cascades crest in Washington; British Columbia to California, east to the Rocky Mountains and northern Great Plains.

Habitat: Common is open plains and foothills, often with sagebrush.

Flowers: March-May

Origin: Native

Conservation Status: Not of concern


Slender annual, simple to freely-branched and loosely ascending, up to 3 dm. tall, usually with fine stalked glands.


Leaves alternate, pinnate, all cauline, the 7-15 leaflets 2-9 mm. long and 1-4 mm. wide.


Flowers terminal and solitary on the branches; calyx 2-5 mm. long, 5-lobed; corolla inconspicuous, whitish, about equaling the calyx, the 5 lobes about equaling the tube; style 3-parted; ovary superior.


Capsule 3-celled.

Accepted Name:
Polemonium micranthum Benth.
Publication: Prodr. 9: 318. 1845.

Synonyms & Misapplications:
Polemoniella micrantha (Benth.) A. Heller
Additional Resources:

PNW Herbaria: Specimen records of Polemonium micranthum in the Consortium of Pacific Northwest Herbaria database.

WA Flora Checklist: Polemonium micranthum checklist entry.

E-Flora BC: Polemonium micranthum atlas page.

CalPhotos: Polemonium micranthum photos.

USDA Plants: Polemonium micranthum information.

41 photographs:
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