Page authors: Don Knoke, David Giblin
Howellia aquatilis
water Howellwort
WTU specimens
Other herbaria

Distribution: Chiefly west of the Cascades in Washington; Washington south to California, east to Idaho and Montana.

Habitat: In ponds and lakes.

Flowers: May-July

Origin: Native

Conservation Status: Threatened in Washington (WANHP)

Description:
General:

Aquatic, annual herbs, the plants rooted, the stem naked below and branched above, the branches spreading or floating, the whole plant green and glabrous, 1-6 dm. long.

Leaves:

Leaves numerous, alternate or whorled in threes, linear or filiform, entire, 1-4.5 cm. long and up to 1.5 mm. wide.

Flowers:

Flowers 3-10, axillary, scattered, the pedicels stout, 1-4 mm. long, merging with the base of the capsule; calyx lobes 5, 1.5-7 mm. long; corolla two-lipped, 2-2.7 mm. long, green, the tube deeply cleft dorsally, or the flowers apetalous; ovary inferior.

Fruits:

Fruit a thin-walled, 1-celled capsule, 5-13 mm. long and 1-2 mm. thick, with a few large, shiny, brown seeds.

Accepted Name:
Howellia aquatilis A. Gray
Publication: Proceedings of the American Academy of Arts and Sciences 15(1): 43-44. 1880.

Synonyms & Misapplications:
(none provided)
Additional Resources:

PNW Herbaria: Specimen records of Howellia aquatilis in the Consortium of Pacific Northwest Herbaria database.

WA Flora Checklist: Howellia aquatilis checklist entry.

E-Flora BC: Howellia aquatilis atlas page.

CalPhotos: Howellia aquatilis photos.

USDA Plants: Howellia aquatilis information.

27 photographs:
Group by