Flora of North America species comparison

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Oenothera heterophylla subsp. heterophylla

Oenothera heterophylla subsp. orientalis
Photo is of parent taxon

variableleaf evening primrose
Photo is of parent taxon

oriental evening primrose
Habit Herbs densely to sparsely strigillose, also at least parts of inflorescence sparsely hirsute with spreading, pustulate-based hairs, and often glandular puberulent and villous. Herbs densely to sparsely strigillose, also at least parts of inflorescence glandular puberulent or glabrate.
Flowers

buds with free tips spreading, 2–6 mm;

floral tube 25–42 mm;

sepals 15–28 mm;

petals 18–35 mm.

buds with free tips usually erect, 1–3 mm;

floral tube 30–47 mm;

sepals 17–30 mm;

petals 25–35 mm.
2n

= 14.

= 14.

Oenothera heterophylla subsp. heterophylla

Oenothera heterophylla subsp. orientalis
Phenology Flowering Jun–Sep. Flowering May–Jul.
Habitat Sandy to sandy-loam soil of open sites in woodlands, with Persea borbonia, Pinus echinata, P. palustris, Quercus incana, Q. marilandica, Q. stellata, and Q. virginiana. Sandy soil of open sites, old alluvium areas in woodlands.
Elevation 0–200 m. (0–700 ft.) 30–60 m. (100–200 ft.)
Distribution
from FNA
LA; TX
[BONAP county map]
from FNA
AL; AR
[BONAP county map]
Discussion

Populations of subsp. heterophylla were determined by W. Dietrich and W. L. Wagner (1988) to be self-incompatible. It occurs in a narrow range from eastern Texas (Austin, Bastrop, Brazos, Cass, Chambers, Cherokee, Dallas, Freestone, Gonzales, Gregg, Hardin, Harris, Henderson, Hopkins, Houston, Jasper, Lee, Leon, Liberty, Limestone, Nacogdoches, Newton, Robertson, Rusk, Sabine, San Augustine, San Jacinto, Smith, Sutton, Travis, Tyler, Upshur, Van Zandt, Victoria, Waller, and Wood counties) and southwestern Louisiana (Caddo, Calcasieu, Erwin, Natchitoches,and Winn parishes). It is known from several historical specimens in St. Louis, Missouri, as an adventive but is apparently no longer growing in that area.

Oenothera variifolia Steudel is a superfluous name that pertains here.

(Discussion copyrighted by Flora of North America; reprinted with permission.)

Subspecies orientalis is known from two disjunct areas: Greene, Pickens, and Sumter counties, Alabama, and Calhoun, Nevada, and Ouachita counties, Arkansas. W. Dietrich and W. L. Wagner (1988) determined populations in Arkansas to be self-incompatible while those sampled in Alabama were self-compatible.

(Discussion copyrighted by Flora of North America; reprinted with permission.)
Source FNA vol. 10. FNA vol. 10.
Parent taxa Onagraceae > subfam. Onagroideae > tribe Onagreae > Oenothera > sect. Oenothera > subsect. Candela > Oenothera heterophylla Onagraceae > subfam. Onagroideae > tribe Onagreae > Oenothera > sect. Oenothera > subsect. Candela > Oenothera heterophylla
Sibling taxa
O. heterophylla subsp. orientalis
O. heterophylla subsp. heterophylla
Synonyms O. pyramidalis var. lindheimeri
Name authority unknown W. Dietrich, P. H. Raven & W. L. Wagner: Ann. Missouri Bot. Gard. 70: 196. (1983)
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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