Page authors: Don Knoke, David Giblin
Trichostema oblongum
mountain bluecurls

Distribution: East of the Cascades in Washington; adjacent Idaho, east through the Columbia River Gorge to the Wilamette Valley of Oregon, and south to California.

Habitat: Moist, open places, often on disturbed soil.

Flowers: July-August

Origin: Native

Growth Duration: Annual

Conservation Status: Review Group 1 in Washington (WANHP)


Taprooted annual, the stem 1-5 dm. tall, simple or branched below, pubescent throughout with mixed short and long, spreading hairs.


Leaves opposite, entire, short-petiolate, not crowded, the blades broadly elliptic, 1.5-5 cm. long and 5-20 mm. wide.


Flowers in short, compact, one-sided, raceme-like, axillary cymes; calyx regular, 5-lobed, 1.5-3 mm. long; corolla tube 2-3.5 mm. long, slightly upcurved, scarcely exerted from the calyx; corolla irregular, violet, the lowest lobe 2-3.5 mm. long and nearly white, the other 4 about half as long and equal; stamens 4, exerted between the upper two corolla lobes, curved, 2.5-6 mm. long.


4 nutlets, united about 1/3 their length.

Accepted Name:
Trichostema oblongum Benth.
Publication: Labiat. Gen. Spec. 659. 1835.

Synonyms & Misapplications:
(none provided)
Additional Resources:

PNW Herbaria: Specimen records of Trichostema oblongum in the Consortium of Pacific Northwest Herbaria database.

WA Flora Checklist: Trichostema oblongum checklist entry.

E-Flora BC: Trichostema oblongum atlas page.

CalPhotos: Trichostema oblongum photos.

USDA Plants: Trichostema oblongum information.

33 photographs:
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