Northern Prairie Wildlife Research Center
Aquatic and Wetland Vascular Plants of the Northern Great Plains
49. Asteraceae, the Aster Family
12. Helianthus L. -- Sunflower
1. Helianthus grosseserratus Martens -- Sawtooth sunflower
Colonial perennial 1-3 m tall; stem strigose in the inflorescence, otherwise
glabrous, often purplish or glaucous. Leaf blades lanceolate to oblong-lanceolate,
10-23 cm long, 2-5 cm wide, acuminate, coarsely serrate with widely spaced teeth,
cuneate to abruptly tapered at the base, scabrous on both surfaces but often
more densely strigose on the paler lower surface; petioles 1-4 cm long.
Involucral bracts linear-lanceolate, acuminate, strigose, sometimes ciliolate;
disk 1.5-2.5 cm across; rays 2.5-4 cm long. Achenes 3-4
mm long. Aug--Oct. Wet meadows, moist prairies and stream margins; w MN, se
ND, e SD, e and c NE and possibly rare in w NE and the Black Hills; (NY to Sask.
s to AR and TX).
See discussion under the following.
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