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Helianthus pauciflorus subsp. pauciflorus  
Family: Asteraceae
stiff sunflower
[Helianthus laetiflorus f. rigidus (Cass.) B.Boivin, moreHelianthus laetiflorus var. rigidus (Cass.) Fern.]
Helianthus pauciflorus subsp. pauciflorus image
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Edward E. Schilling in Flora of North America (vol. 21)
Plants 80-200 cm. Leaves usually alternate distally; blades oblong-lanceolate to lance-ovate, 8-27 cm, apices acuminate. Flowering late summer-fall. Dry to moderately wet prairies, open places; 50-600+ m; Alta., B.C., Man., Ont., P.E.I., Que., Sask.; Ark., Conn., Ga., Ill., Ind., Iowa, Kans., Ky., Maine, Mass., Mich., Minn., Mo., Mont., Nebr., N.H., N.J., N.Dak., Okla., R.I., S.Dak., Tex., Vt., Va., Wis. Subspecies pauciflorus is introduced in Ontario, and probably in all eastern Canada.

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Helianthus pauciflorus subsp. pauciflorus
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