Burke: Oenothera laciniata vs. Oenothera flava

	Oenothera laciniata	Oenothera flava
		long-tubed evening primrose
Habit		Tufted, acaulescent, sub-glabrous perennial.
Leaves		Leaves basal, in rosettes, oblanceolate, 5-20 cm. long and up to 15 mm. broad, the lower third pinnatifid with backward-angled lobes, the upper portion entire or wavy-dentate.
Flowers		Flowers sessile; calyx tube purplish, slender, 2-12 cm. long, the 4 lobes reflexed, free or partly fused and turned to one side; petals 10-20 mm. long, yellow, aging to purplish; stamens 8; stigma with 4 linear lobes 3 mm. long; ovary inferior, 4-celled.
Fruits		Capsule woody, ovoid, 10-20 cm. long, conspicuously winged.

	Oenothera laciniata	Oenothera flava
Flowering time		July-August
Habitat		Hard-packed soil in swales or around vernal pools in the plains and lower foothills.
Distribution	[WildflowerSearch map] [BONAP county map]	Occurring east of the Cascades crest, where known historically from the south-central area. Washington to California, east to the Rocky Mountains and Great Plains. [WildflowerSearch map] [BONAP county map]
Origin		Native
Conservation status		Historical in Washington (WANHP)
Sibling taxa	O. biennis, O. cespitosa, O. curtiflora, O. elata, O. flava, O. glazioviana, O. pallida, O. suffrutescens	O. biennis, O. cespitosa, O. curtiflora, O. elata, O. glazioviana, O. pallida, O. suffrutescens
Web links	Local floras: CA Local Web sites: CalFlora, CalPhotos, Flora NW, PNW Herbaria WildflowerSearch iNaturalist (observations) USDA Plants Database LBJ Wildflower Center SEINet Plants of the World Online Encyclopedia of Life Wikipedia Google Image Search	Local floras: CA, OR, WA Local Web sites: CalFlora, CalPhotos, Flora NW, PNW Herbaria WildflowerSearch iNaturalist (observations) USDA Plants Database LBJ Wildflower Center SEINet Plants of the World Online Encyclopedia of Life Wikipedia Google Image Search

Oenothera laciniata

Oenothera flava

long-tubed evening primrose

Habit

Tufted, acaulescent, sub-glabrous perennial.

Leaves

Leaves basal, in rosettes, oblanceolate, 5-20 cm. long and up to 15 mm. broad, the lower third pinnatifid with backward-angled lobes, the upper portion entire or wavy-dentate.

Flowers

Flowers sessile;

calyx tube purplish, slender, 2-12 cm. long, the 4 lobes reflexed, free or partly fused and turned to one side;

petals 10-20 mm. long, yellow, aging to purplish;

stamens 8;

stigma with 4 linear lobes 3 mm. long;

ovary inferior, 4-celled.

Fruits

Capsule woody, ovoid, 10-20 cm. long, conspicuously winged.

Oenothera laciniata

Oenothera flava

Flowering time

July-August

Habitat

Hard-packed soil in swales or around vernal pools in the plains and lower foothills.

Distribution

[WildflowerSearch map]

[BONAP county map]

Occurring east of the Cascades crest, where known historically from the south-central area. Washington to California, east to the Rocky Mountains and Great Plains.

[WildflowerSearch map]

[BONAP county map]

Origin

Native

Conservation status

Historical in Washington (WANHP)

Sibling taxa