Page authors: Don Knoke, David Giblin
Centromadia pungens
common spikeweed
Specimens
Photos

Distribution: Occurring east of the Cascades crest in central and south-central Washington; central Washington to California, where native east to Idaho, Nevada, and Arizona.

Habitat: Roadsides, fields, ditches, wastelots, and other disturbed, open places at low to middle elevations.

Flowers: July-Sept.

Origin: Introduced from California

Growth Duration: Annual

Conservation Status: Not of concern

Pollination: Bees, flies, beetles, wasps

Description:
General:

Coarse annual 1-10 cm. tall, somewhat hairy.

Leaves:

Leaves alternate, numerous, pungent, rigid, the lower 2-6 cm.long, pinnatifid, the upper smaller and linear.

Flowers:

Heads several, hemispheric; involucre 3-5 mm. high, with firm, spine-tipped bracts each clasping the outer half of a ray achene, closely subtended by linear, spine-tipped leaves; rays 15-35, pale yellow, 4-7 mm. long, 2-toothed; disk flowers yellow, sterile; receptacle convex, chaffy throughout; pappus none.

Fruits:

Achenes

Accepted Name:
Centromadia pungens (Hook. & Arn.) Greene
Publication: Man. Bot. San Francisco. 196. 1894.

Synonyms & Misapplications:
Hemizonia pungens (Hook. & Arn.) Torr. & A. Gray [HC]
Infraspecies:
Additional Resources:

PNW Herbaria: Specimen records of Centromadia pungens in the Consortium of Pacific Northwest Herbaria database

WA Flora Checklist: Centromadia pungens checklist entry

OregonFlora: Centromadia pungens information

E-Flora BC: Centromadia pungens atlas page

CalPhotos: Centromadia pungens photos

20 photographs:
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