Helianthus nuttallii subsp. rydbergii

(Britton) R. W. Long

Brittonia 18: 77. 1966.

Common names: Rydberg’s sunflower
Endemic
Basionym: Helianthus rydbergii Britton Man. Fl. N. States, 993. 1901
Treatment appears in FNA Volume 21. Treatment on page 167.

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).


Phenology: Flowering late summer–fall.
Habitat: Open areas, sandy dry soils, wet places
Elevation: 200–1000 m

Distribution

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Alta., Man., Ont., Que., Sask., Colo., Iowa, Minn., Mont., Nebr., N.Dak., S.Dak.

Discussion

Selected References

None.

Lower Taxa

None.
Edward E. Schilling +
- Britton R. W. Long +
Helianthus rydbergii +
Rydberg’s sunflower +
Alta. +, Man. +, Ont. +, Que. +, Sask. +, Colo. +, Iowa +, Minn. +, Mont. +, Nebr. +, N.Dak. +  and S.Dak. +
200–1000 m +
Open areas, sandy dry soils, wet places +
Flowering late summer–fall. +
Undefined - tribe Undefined subtribe Lagasceinae +
Helianthus nuttallii subsp. rydbergii +
Helianthus nuttallii +
subspecies +