Flora of North America species comparison

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Oenothera macrocarpa subsp. macrocarpa
Photo is of parent taxon

bigfruit evening primrose
Habit Herbs strigillose and glandular puberulent distally.
Stems

several, unbranched, sometimes with shorter secondary branches, 10–40(–60) cm.
Leaves

green, younger ones grayish green, (6–)8–12(–14.5) × 0.4–2.3(–3) cm;

blade often lanceolate-elliptic to broadly elliptic, sometimes linear or lanceolate, margins usually flat, sometimes undulate, entire or inconspicuously denticulate, apex acute.
Flowers

buds with unequal free tips (4–)8–10(–12) mm;

floral tube (78–)95–115(–140) mm;

sepals (45–)50–65(–75) mm;

petals (40–)50–65(–68) mm;

filaments (25–)30–40(–44) mm, anthers (15–)17–24 mm;

style (120–)135–160(–190) mm.
Capsules

ovoid, narrowly ovoid, narrowly lanceoloid to broadly ellipsoid, or subglobose, not twisted, wings (14–)18–34 mm wide, body 52–70(–115) × 7–8 mm.
2n

= 14.

Oenothera macrocarpa subsp. macrocarpa
Phenology Flowering Apr–Jun(Sep).
Habitat Rocky, clay, alkaline soil, unglaciated prairies, glades, bluffs, open prairie hillsides, disturbed sites, limestone or dolomite.
Elevation 100–500 m. (300–1600 ft.)
Distribution
from FNA
AR; IL; KS; MO; NE; OK; TN; TX
[BONAP county map]
Discussion

Subspecies macrocarpa is known from three disjunct areas: southeastern Nebraska, eastern half of Kansas, Craig and Washington counties, Oklahoma, east to Missouri south of the Missouri River and St. Clair County, Illinois, and to the northern tier of counties in Arkansas; glades near Murfreesboro, Rutherford County, Tennessee; and Blackland Prairies, Cross Timbers and eastern Edwards Plateau, from Bryan, Johnston, and Pontotoc counties, Oklahoma, southwest to Bexar, Coke, Kerr, and McCulloch counties, Texas.

(Discussion copyrighted by Flora of North America; reprinted with permission.)
Source FNA vol. 10.
Parent taxa Onagraceae > subfam. Onagroideae > tribe Onagreae > Oenothera > sect. Megapterium > Oenothera macrocarpa
Sibling taxa
O. macrocarpa subsp. fremontii, O. macrocarpa subsp. incana, O. macrocarpa subsp. oklahomensis
Synonyms Megapterium missourense, O. macrocarpa var. missourensis, O. missourensis, O. missourensis var. latifolia
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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