The green links below add additional plants to the comparison table. Blue links lead to other Web sites.
enable glossary links
Photo is of parent taxon

fragrant evening-primrose

Habit Herbs caulescent or acaulescent, usually moderately to densely hirsute and glandular puberulent, rarely exclusively glandular puberulent.
Stems

usually unbranched, rarely with 1–several branches from near base, 10–40 cm.

Leaves

(2.8–)10–26(–36) × (0.6–)1–3(–4.5) cm;

petiole (3–)4–11(–14) cm;

blade usually oblanceolate to narrowly elliptic, rarely lanceolate, margins coarsely and irregularly pinnately lobed to dentate or, rarely, serrate.

Flowers

floral tube (41–)80–140(–165) mm;

sepals (22–)34–45(–54) mm;

petals fading pink to lavender, (24–)35–50(–60) mm;

filaments (16–)20–30(–35) mm, anthers (10–)12–17(–20) mm;

style (78–)100–150(–185) mm.

Capsules

straight, cylindrical to, sometimes, lanceoloid-cylindrical, slightly asymmetrical, (21–)25–50(–68) × 6–8 mm, valve margins with minute to conspicuous tubercles, these sometimes coalesced into a sinuate ridge;

pedicel (0–)1–40(–55) mm.

Seeds

usually narrowly to broadly obovoid, rarely suborbicular, 2.2–3.4 × 1.1–2.6 mm, embryo 1/5–1/2 of seed volume, surface appearing longitudinally striate, reticulate under magnification;

seed collar large, usually appearing inflated, sealed by a flat membrane which is often slightly depressed into seed collar cavity, margin entire or obscurely sinuate distally.

2n

= 14.

Oenothera cespitosa subsp. marginata

Phenology Flowering Mar–Aug.
Habitat Rocky slopes, cracks in rocks, talus, along gravelly creek beds and arroyos, roadcuts in loose to somewhat compacted soil derived from granite, sandstone, limestone, volcanic cinder, rarely shale, mostly in foothill communities of pinyon-juniper woodlands, big sagebrush scrub, chaparral, grass­lands, openings in ponderosa pine forests.
Elevation (400–)1200–2300(–3100) m. ((1300–)3900–7500(–10200) ft.)
Distribution
from FNA
AZ; CA; CO; ID; NM; NV; OR; TX; UT; WA; WY; Mexico (Chihuahua, Sonora)
Source FNA vol. 10.
Parent taxa Onagraceae > subfam. Onagroideae > tribe Onagreae > Oenothera > sect. Pachylophus > Oenothera cespitosa
Sibling taxa
O. cespitosa subsp. cespitosa, O. cespitosa subsp. crinita, O. cespitosa subsp. macroglottis, O. cespitosa subsp. navajoensis
Synonyms O. marginata, Anogra longiflora, O. cespitosa subsp. eximia, O. cespitosa var. eximia, O. cespitosa var. longiflora, O. cespitosa var. marginata, O. eximia, O. idahoensis, Pachylophus cylindrocarpus, P. exiguus, P. eximius, P. longiflorus, P. marginatus, P. prolatus
Name authority (Nuttall ex Hooker & Arnott) Munz in N. L. Britton et al.: N. Amer. Fl., ser. 2, 5: 101. (1965) — (as caespitosa)
Web links