Page authors: Don Knoke, David Giblin
Mazus pumilus
Japanese mazus
Specimens
Photos

Distribution: Occurring east of the Cascades crest and in the Columbia River Gorge in Washington; southern Washington to adjacent northern Oregon along the Columbia River; also in the southeastern U.S.

Habitat: Moist, sandy or silty riverbanks, and lawns.

Flowers: May-November

Origin: Introduced from Asia

Growth Duration: Annual

Conservation Status: Not of concern

Description:
General:

Annual, branched from the base, the stem up to 15 cm. tall and covered with spreading hairs.

Leaves:

Basal leaves rounded above and narrowed toward the base, up to 4 cm long and 15 mm. wide, irregularly toothed; cauline leaves similar but smaller, opposite.

Flowers:

Inflorescence a naked raceme that is longer than the proper stem, openly 4-10 flowered; calyx 5-cleft to the middle, 4-5 mm. long; corolla bilabiate, 7-10 mm. long, blue-violet, marked with yellow and white, the upper lip short and 2-toothed, the lower lip much larger, 3-lobed; stamens 4, one pair longer; stigmas 2, flattened.

Fruits:

Capsule.

Accepted Name:
Mazus pumilus (Burm. f.) Steenis
Publication: Nova Guinea ser. 2, 9: 31. 1951.

Synonyms & Misapplications:
Mazus japonicus (Thunb.) Kuntze [HC]
Infraspecies:
Additional Resources:

PNW Herbaria: Specimen records of Mazus pumilus in the Consortium of Pacific Northwest Herbaria database

WA Flora Checklist: Mazus pumilus checklist entry

OregonFlora: Mazus pumilus information

E-Flora BC: Mazus pumilus atlas page

CalPhotos: Mazus pumilus photos

12 photographs:
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