Carduus acanthoides
plumeless thistle, spiny plumeless thistle
WTU specimens
Other herbaria

Distribution: Introduced in much of the United States; uncommon in Washington and Idaho

Habitat: Disturbed, dry ground.

Flowers: July - October

Origin: Introduced from Europe

Conservation Status: Not of concern

Description:
General:

Biennial herb 3-15 dm. tall, the stem tough and strongly spiny.

Leaves:

Leaves deeply lobed to pinnatifid, up to 25 cm. long and 8 cm. wide, the midrib beneath covered with long, soft hairs.

Flowers:

Heads clustered or solitary at the ends of the branches, erect, the disk mostly 1.5-2.5 cm. wide; involucre bracts narrow, under 2 mm. wide, erect, the middle and outer bracts spine-tipped, the inner softer and scarcely spiny; flowers purple; pappus capillary, not plumose.

Fruits:

Achenes glabrous.

Accepted Name:
Carduus acanthoides L.
Publication: Sp. Pl. 2: 821. 1753.

Synonyms & Misapplications:
(none provided)
Infraspecies:
ssp. acanthoides – plumeless thistle, spiny plumeless thistle
Additional Resources:

PNW Herbaria: Specimen records of Carduus acanthoides in the Consortium of Pacific Northwest Herbaria database.

WA Flora Checklist: Carduus acanthoides checklist entry.

E-Flora BC: Carduus acanthoides atlas page.

CalPhotos: Carduus acanthoides photos.

USDA Plants: Carduus acanthoides information.

12 photographs:
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