Flora of North America species comparison

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Oenothera villosa subsp. strigosa
Photo is of parent taxon

hairy evening primrose, stiff hairy evening-primrose, yellow evening-primrose
Habit Herbs flushed with red, at least proximally, often red throughout, strigillose, rarely exclusively so, usually also villous with erect to ascending or subappressed red-pustulate hairs, and glandular puberulent, at least distally.
Leaves

green to dull green, blade margins usually denticulate or subentire, sometimes moderately dentate, venation not prominent.
Inflorescences

relatively open, apex obtuse, internodes in fruit usually equal to or longer than capsule.
Flowers

sepals red-striped or flushed with red.
2n

= 14.

Oenothera villosa subsp. strigosa
Phenology Flowering Jun–Sep.
Habitat Open, often wet sites, stream­sides, fields, roadsides.
Elevation 30–3200 m. (100–10500 ft.)
Distribution
from FNA
AZ; CA; CO; ID; MI; MN; MT; ND; NE; NM; NV; OR; SD; UT; WA; WI; WY; AB; BC; MB; NT; ON; SK
[BONAP county map]
Discussion

Subspecies strigosa occurs primarily in the Pacific Northwest southeast through the Rocky Mountains, and is found in mostly montane and foothill habitats. It has not spread much, if at all, outside of its native range.

Oenothera strigosa (Rydberg) Mackenzie & Bush is an illegitimate later homonym that pertains here; O. rydbergii House and O. strigosa (Rydberg) Mackenzie & Bush var. subulifera R. R. Gates also pertain here and are superfluous names.

(Discussion copyrighted by Flora of North America; reprinted with permission.)
Source FNA vol. 10.
Parent taxa Onagraceae > subfam. Onagroideae > tribe Onagreae > Oenothera > sect. Oenothera > subsect. Oenothera > Oenothera villosa
Sibling taxa
O. villosa subsp. villosa
Synonyms Onagra strigosa, O. biennis var. strigosa, O. cheradophila, O. procera, O. strigosa subsp. cheradophila, O. strigosa var. cheradophila, O. strigosa var. procera, O. subulifera, O. villosa subsp. cheradophila, O. villosa var. strigosa, Onagra biennis var. strigosa, O. strigosa var. subulata, Usoricum strigosum
Name authority (Rydberg) W. Dietrich & P. H. Raven: Ann. Missouri Bot. Gard. 63: 383. (1977)
Web links 
Unless otherwise noted, all data comes from the online version of the Flora of North America, who have made most of their content available via a Creative Commons license (CC BY 4.0).



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