Helianthus nuttallii subsp. rydbergii (Britton) R.W. Long (redirected from: Helianthus nuttallii var. rydbergii)
Family: Asteraceae
[Helianthus nuttallii var. rydbergii (Britton) B. Boivin,  more...]
Images
not available

Plants usually 100-250 cm. Leaves all or mostly opposite; blades lanceolate to nearly ovate, apices acute to obtuse, abaxial faces hispid to hispidulous. Phyllaries: abaxial faces ± glabrate or sparsely hairy (longer hairs 0.5-1 mm).

Flowering late summer-fall. Open areas, sandy dry soils, wet places; 200-1000 m; Alta., Man., Ont., Que., Sask.; Colo., Iowa, Minn., Mont., Nebr., N.Dak., S.Dak.