Flora of North America species comparison

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Oenothera fruticosa subsp. tetragona
Photo is of parent taxon

narrowleaf evening primrose
Habit Herbs mostly glandular puberulent or glabrous, sometimes strigillose or villous on stems; from fibrous rootstock.
Leaves

in a basal rosette and cauline, basal 3–12 × 0.5–3 cm, petiole 1–3 cm, blade oblanceolate to obovate, margins dentate to remotely denticulate;

cauline 2–6(–11) × (0.5–)1–2(–5) cm, sometimes glaucous;

petiole 0.1–2(–6) cm;

blade narrowly elliptic to broadly ovate, margins dentate to remotely denticulate.
Flowers

buds with free tips (3–)4–8(–13) mm, connivent to spreading;

floral tube 5–20 mm;

sepals 8–22 mm;

petals (8–)15–20(–30) mm.
Capsules

oblong to oblong-ellipsoid, widest at middle, (5–)10–17(–20) × (2–)3–4(–6) mm, 4-winged, sometimes 4-angled, stipe 0.1–3(–7) mm;

sessile.
2n

= 28.

Oenothera fruticosa subsp. tetragona
Phenology Flowering Apr–Aug(–Sep).
Habitat Open meadows, stream margins, edges of woods, open woods.
Elevation (100–)300–1700 m. ((300–)1000–5600 ft.)
Distribution
from FNA
AL; CT; DC; DE; GA; IL; IN; KY; LA; MA; MD; ME; MI; MO; NC; NH; NY; OH; PA; RI; SC; TN; VA; WV; NS; ON; QC
Discussion

Oenothera serotina Sweet (1826) is a homonym, not Lehmann (1826), while Kneiffia floribunda Spach (1835) is an illegitimate substitution based on O. tetragona, and both names pertain here.

(Discussion copyrighted by Flora of North America; reprinted with permission.)
Source FNA vol. 10.
Parent taxa Onagraceae > subfam. Onagroideae > tribe Onagreae > Oenothera > sect. Kneiffia > Oenothera fruticosa
Sibling taxa
O. fruticosa subsp. fruticosa
Synonyms O. tetragona, Kneiffia fraseri, K. fruticosa var. differta, K. glauca, K. latifolia, K. serotina, K. tetragona, K. tetragona var. hybrida, O. ambigua, O. canadensis, O. fraseri, O. fruticosa var. ambigua, O. fruticosa var. differta, O. fruticosa var. fraseri, O. fruticosa subsp. glauca, O. fruticosa var. glauca, O. fruticosa var. incana, O. fruticosa var. maculata, O. glauca, O. glauca var. fraseri, O. hybrida, O. hybrida var. ambigua, O. incana, O. serotina, O. tetragona var. fraseri, O. tetragona subsp. glauca, O. tetragona var. hybrida, O. tetragona var. latifolia
Name authority (Roth) W. L. Wagner: PhytoKeys 34: 16. (2014)
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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