Page author: Don Knoke
Helianthus tuberosus
Jerusalem artichoke
WTU specimens
Other herbaria

Distribution: Introdued and widespread in eastern United States; uncommon in the Pacific Northwest.

Habitat: Moist soil and waste places.

Flowers: August - October

Origin: Introduced

Conservation Status: Not of concern

Description:
General:

Perennial with tuber-bearing rhizomes, the stem stout, pubescent, 0.7-5 m. tall.

Leaves:

Leaves opposite below and alternate above, broadly lanceolate to ovate, acuminate, 10-25 cm. long and 4-12 cm. wide, with winged petioles 2-8 cm. long, the blades serrate, scabrous above.

Flowers:

Heads usually numerous, the disk 1.5-2.5 cm. wide, the receptacle chaffy; involucre bracts dark, narrowly lanceolate, acuminate, exceeding the disk, scabrous on the back; disk flowers yellow, perfect; ray flowers 10-20, yellow, neutral, 2-4 cm. long; pappus of 2 deciduous awns.

Fruits:

Achenes thick, compressed.

Accepted Name:
Helianthus tuberosus L.
Publication: Sp. Pl. 2: 905. 1753. 1753.

Synonyms & Misapplications:
(none provided)
Additional Resources:

PNW Herbaria: Specimen records of Helianthus tuberosus in the Consortium of Pacific Northwest Herbaria database.

WA Flora Checklist: Helianthus tuberosus checklist entry.

E-Flora BC: Helianthus tuberosus atlas page.

CalPhotos: Helianthus tuberosus photos.

USDA Plants: Helianthus tuberosus information.

10 photographs:
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