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Photo is of parent taxon

bigfruit evening primrose

Photo is of parent taxon
Habit Herbs strigillose and glandular puberulent distally. Herbs strigillose, usually densely so, rarely glabrous, and sometimes glandular puberulent distally.
Stems

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

several, unbranched, sometimes with shorter secondary branches, 1–20(–30) 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.

usually gray, rarely green, (5–)6.2–12.5(–17) ×2–4.3 cm;

blade usually very broadly elliptic to suborbiculate, rarely oblanceolate or elliptic, margins usually flat, sometimes undulate, usually entire, sometimes inconspicuously denticulate, apex usually acute to obtuse, sometimes retuse.

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.

buds with unequal free tips 5–11 mm;

floral tube (50–)70–140(–160) mm;

sepals (25–)35–50 mm;

petals (25–)31–50(–52) mm;

filaments (13–)15–25(–28) mm, anthers(10–)14–20 mm;

style (75–)100–192 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.

broadly ellipsoid to globose, not twisted, wings 10–15(–24) mm wide, body 28–48(–74) × 6–8 mm.

2n

= 14.

= 14.

Oenothera macrocarpa subsp. macrocarpa

Oenothera macrocarpa subsp. incana

Phenology Flowering Apr–Jun(Sep). Flowering Apr–Jun(–Aug).
Habitat Rocky, clay, alkaline soil, unglaciated prairies, glades, bluffs, open prairie hillsides, disturbed sites, limestone or dolomite. Rocky, clay soil, grass­lands, disturbed sites, limestone, gypsum, rarely igneous soil.
Elevation 100–500 m. (300–1600 ft.) (500–)600–1200 m. ((1600–)2000–3900 ft.)
Distribution
from FNA
AR; IL; KS; MO; NE; OK; TN; TX
[BONAP county map]
from FNA
KS; OK; 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.)

Subspecies incana occurs on the high plains in Clark, Comanche, Kiowa, and Meade counties, Kansas, south across Oklahoma as far east as Comanche and Harper counties to the Texas Panhandle to Garza and Knox counties; one collection is known from Taylor County, Texas.

(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. Megapterium > Oenothera macrocarpa Onagraceae > subfam. Onagroideae > tribe Onagreae > Oenothera > sect. Megapterium > Oenothera macrocarpa
Sibling taxa
O. macrocarpa subsp. fremontii, O. macrocarpa subsp. incana, O. macrocarpa subsp. oklahomensis
O. macrocarpa subsp. fremontii, O. macrocarpa subsp. macrocarpa, O. macrocarpa subsp. oklahomensis
Synonyms Megapterium missourense, O. macrocarpa var. missourensis, O. missourensis, O. missourensis var. latifolia Oenotheramissourensis sims var. incana, Megapterium argyrophyllum, O. macrocarpa var. incana
Name authority unknown (A. Gray) W. L. Wagner: Ann. Missouri Bot. Gard. 70: 194. (1983)
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