Page authors: Don Knoke, David Giblin
Tripleurospermum maritimum
scentless chamomile, scentless mayweed, sea mayweed
Specimens
Photos

Distribution: Occurring chiefly west of the Cascades crest in Washington; Washington and California; also in eastern North America.

Habitat: Roadsides, fields, waste ground.

Flowers: June-September

Growth Duration: Biennial, Perennial

Conservation Status: Not of concern

Pollination: Bees, flies, beetles, wasps

Description:
General:

Usually glabrous perennials, the 1-5 stems 10-50 cm. tall, usually procumbent and branched above.

Leaves:

Leaves basal and cauline, the blades 2-8 cm. long, oblong, 1-3 pinnately lobed, the ultimate lobes cylindric and fleshy.

Flowers:

Heads 10-50 in flat-topped inflorescences; involucre bracts oblong to narrowly triangular, unequal, dark greenish to brownish with pale to dark brown scarious margins, 0.2-1 mm. wide; ray flowers strap-shaped, white, 10-34, 10-16 mm. long; disk corollas yellow, 2.5 mm. long; pappus none.

Fruits:

Achenes pale to dark blackish-brown, with resin glands over twice as long as wide.

Accepted Name:
Tripleurospermum maritimum (L.) W.D.J. Koch
Publication: Syn. Fl. Germ. Helv. ed. 2. 1026. 1845.

Synonyms & Misapplications:
Chamomilla maritima (L.) Rydb.
Matricaria maritima L. [HC]
Infraspecies:
Additional Resources:

PNW Herbaria: Specimen records of Tripleurospermum maritimum in the Consortium of Pacific Northwest Herbaria database

WA Flora Checklist: Tripleurospermum maritimum checklist entry

OregonFlora: Tripleurospermum maritimum information

E-Flora BC: Tripleurospermum maritimum atlas page

CalPhotos: Tripleurospermum maritimum photos

3 photographs:
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