Page author: Don Knoke
Helianthus maximiliani
narrow leaved sunflower
WTU specimens
Other herbaria

Distribution: Introduced from east of the Rockies to British Columbia, Idaho, and eastern Washington.

Habitat: Dry, open places, often on waste ground.

Flowers: July-September

Origin: Introduced

Conservation Status: Not of concern

Description:
General:

Perennial with crown buds, short rhizomes, and fleshy roots, the stem 0.5-3 m. tall, pubescent upwards with short, white, appressed hairs.

Leaves:

Leaves lanceolate, acuminate, narrowed to a short, winged petiole, 7-15 cm. long and 1-3 cm. wide, entire or occasionally toothed, pinnately veined, strongly scabrous on both sides; leaves mostly opposite, but upper leaves usually alternate.

Flowers:

Heads usually several, the disk 1.5-2.5 cm. wide, yellow, the flowers perfect; involucre bracts narrow, firm, attenuate, exceeding the disk, grayish with short hairs; rays 10-25, yellow, neutral, 1.5-4 cm. long; receptacle chaffy throughout; pappus of 2 awns.

Fruits:

Heads usually several, the disk 1.5-2.5 cm. wide, yellow, the flowers perfect; involucre bracts narrow, firm, attenuate, exceeding the disk, grayish with short hairs; rays 10-25, yellow, neutral, 1.5-4 cm. long; receptacle chaffy throughout; pappus of 2 awns.

Accepted Name:
Helianthus maximiliani Schrad.
Publication: Index Seminum (Göttingen). 1834: unpaged. 1835. 1835.

Synonyms & Misapplications:
Helianthus maximilianii Schrad. [HC]
Additional Resources:

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

WA Flora Checklist: Helianthus maximiliani checklist entry.

E-Flora BC: Helianthus maximiliani atlas page.

CalPhotos: Helianthus maximiliani photos.

USDA Plants: Helianthus maximiliani information.

4 photographs:
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