Flora of North America species comparison

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Oenothera fruticosa subsp. fruticosa
Photo is of parent taxon

narrowleaf evening primrose
Habit Herbs moderately to densely strigillose, and/or sometimes glandular puberulent or villous; from fibrous or, sometimes, slightly fleshy rootstock or producing rhizomes.
Leaves

basal 3–10 × 0.5–2 cm, petiole 1–4 cm, blade oblanceolate to obovate, margins subentire or weakly and remotely denticulate;

cauline 2–6(–8) × 0.1–1(–1.7) cm, petiole 0.2–2(–4) cm, blade linear, lanceolate to oblanceolate, narrowly elliptic, or narrowly ovate, margins subentire or weakly and remotely denticulate.
Flowers

buds with free tips 0.5–1(–6) mm, usually connivent, sometimes spreading;

floral tube5–15 mm;

sepals 5–20 mm;

petals (8–)15–25 mm.
Capsules

clavate to oblong-clavate, widest distal to middle, angled, rarely narrowly winged, (5–)10–17(–20) × (2–)3–4 mm, stipe 3–10 mm;

sessile.
2n

= 28, 42.

Oenothera fruticosa subsp. fruticosa
Phenology Flowering Apr–Aug(–Sep).
Habitat Open habitats, meadows, stream margins, edges of woods, open woods, margins of freshwater or saltwater marshes, stabilized sand dunes, roadsides, partially disturbed habitats.
Elevation 0–500(–1100) m. (0–1600(–3600) ft.)
Distribution
from FNA
AL; AR; CT; DC; DE; FL; GA; IL; IN; KY; LA; MA; MD; MO; MS; NC; NY; OH; OK; PA; SC; TN; VA; WV
[BONAP county map]
Discussion

Kneiffia suffruticosa Spach (1835) is an illegitimate substitution for Oenothera fruticosa, as is K. angustifolia Spach (1835) one for O. linearis Michaux, and O. linearis var. allenii Britton (1894) is one based on O. fruticosa var. humifusa.

(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. tetragona
Synonyms Kneiffia allenii, K. arenicola, K. brevistipata, K. charlesii, K. fruticosa var. humifusa, K. fruticosa var. unguiculata, K. linearis, K. longipedicellata, K. semiglandulosa, K. subglobosa, K. tetragona var. longistipata, K. velutina, O. fruticosa var. eamesii, O. fruticosa var. goodmanii, O. fruticosa var. humifusa, O. fruticosa var. linearifolia, O. fruticosa var. linearis, O. fruticosa var. microcarpa, O. fruticosa var. subglobosa, O. fruticosa var. unguiculata, O. fruticosa var. vera, O. linearis, O. linearis var. eamesii, O. longipedicellata, O. subglobosa, O. subglobosa var. arenicola, O. tetragona var. brevistipata, O. tetragona var. longistipata, O. tetragona var. sharpii, O. tetragona var. velutina, O. unguiculata
Name authority unknown
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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