Mazus pumilus
Japanese mazus
WTU specimens
Other herbaria

Distribution: Introduced in eastern United States and in scattered locations in southwest Washington and adjacent Oregon.

Habitat: Lawns and wet bottom lands.

Flowers: May - November

Origin: Introduced from Asia

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

Synonyms & Misapplications:
Mazus japonicus (Thunb.) Kuntze [HC]
Infraspecies:
var. pumilus – Japanese mazus
Additional Resources:

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

WA Flora Checklist: Mazus pumilus checklist entry.

E-Flora BC: Mazus pumilus atlas page.

CalPhotos: Mazus pumilus photos.

USDA Plants: Mazus pumilus information.

12 photographs:
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