Oenothera species

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Scientific Name Oenothera flava USDA PLANTS Symbol OEFL
Common Name Yellow Evening Primrose, Long-tube Evening Primrose ITIS Taxonomic Serial No. 27397
Family Onagraceae (Evening Primrose) SEINet
Reference
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Description Life zones and habitat: Plains to subalpine (5500 to 10500 ft.); sandy, gravelly loam soils in meadows, sagebrush areas, floodplains and disturbed areas.
Plant: Low-growing, stemless perennial up to about 8 inches tall.
Leaves: Dense basal rosette of leaves that are oblanceolate to oblong in outline with entire or irregularly pinnately-lobed margins; 2 to 12 inches long.
Inflorescence: Solitary trumpet-shaped yellow blossoms arising from the center of the basal rosette with a purplish floral tube 1-1/4 to 5+ inches long; corolla with 4 spreading petals up to 3/4-inch long; 8 stamens of unequal length; protruding yellow cross-shaped stigma extends beyond the stamens; 4 sepals below bend backward; blossom opens in the evening and closes the next morning, corolla fading to pink or purple.
Bloom Period: June to August.
References: "Flora of Colorado" by Jennifer Ackerfield, Wildflowers of New Mexico and UW Burke Herbarium and Yavapai County Plants.
BONAP Distribution Map

Colorado Status:
Native
Scientific Name Oenothera lavandulifolia (Calylophus lavandulifolius) USDA PLANTS Symbol CALA38
Common Name Lavender-leaf Sundrops ITIS Taxonomic Serial No. 517708
Family Onagraceae (Evening Primrose) SEINet
Reference
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Description Life zones and habitat: Plains to montane (4800 to 8700 ft.); dry rocky, sandy or gravelly soils in open shrublands, prairies and pinyon woodlands.
Plant: Low-growing perennial with decumbent to ascending stems, usually branched, 3 to 12 inches tall; with densely appressed hairs.
Leaves: Crowded, alternate, linear to narrowly lanceolate or elliptic, up to 2 inches long and 1/4-inch wide; margins entire; surfaces covered with appressed grayish hairs.
Inflorescence: Large yellow solitary blossoms arising from leaf axils, fading to pink or orange; trumpet-shaped corolla with 4 spreading, crinkly petals up to 2 inches across; floral tube 1 to 3+ inches long; protruding yellow disk-shaped stigma; 8 protruding yellow stamens.
Bloom Period: May to August.
References: "Flora of Colorado" by Jennifer Ackerfield, American Southwest and Kansas Wildflowers and Grasses.
BONAP Distribution Map

Colorado Status:
Native
Scientific Name Oenothera villosa ssp. strigosa USDA PLANTS Symbol OEVIS
Common Name Hairy Evening Primrose, Common Evening Primrose ITIS Taxonomic Serial No. 524368
Family Onagraceae (Evening Primrose) SEINet
Reference
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Description Life zones and habitat: Plains to montane (4800 to 9500 ft.); dry shrubland, roadsides and disturbed areas.
Plant: Erect biennial or short-lived perennial 1 to 5 feet tall; basal rosette forms in first year, erect, stiff stem develops in second.
Leaves: Stem leaves lanceolate to elliptic, alternate, hairy with wavy edges, 4 to 12 inches long and 1/2 to 1-1/2 inches wide.
Inflorescence: Spike of a few erect flower buds atop a 1 to 1-1/2 inch long calyx tube with large hairy bract or leaf below each; yellow blossom 1 to 1-1/2 inches across, aging to orange, opening in the evening; somewhat hairy sepals.
Bloom Period: June to September.
Fruit: Narrowly lanceolate-cylindrical, hairy capsules, 3/4 to 1-3/8 inches long and less than 1/4-inch wide.
References: "Flora of Colorado" by Jennifer Ackerfield, SEINet and E-Flora BC.
BONAP Distribution Map

Colorado Status:
Native
Scientific Name Oenothera villosa ssp. villosa USDA PLANTS Symbol OEVIV
Common Name Hairy Evening Primrose, Common Evening Primrose ITIS Taxonomic Serial No. 524369
Family Onagraceae (Evening Primrose) SEINet
Reference
Click Here
Description Life zones and habitat: Plains to montane (3500 to 8700 ft.); dry shrubland, roadsides and disturbed areas.
Plant: Erect biennial or short-lived perennial 1 to 5 feet tall; basal rosette forms in first year, erect, stiff stem develops in second.
Leaves: Stem leaves lanceolate to elliptic, alternate, hairy with toothed edges, 4 to 12 inches long and 1/2 to 1-1/2 inches wide.
Inflorescence: Spike of a few erect flower buds atop a 1 to 1-1/2 inch long calyx tube with large hairy bract or leaf below each; yellow blossom 1 to 1-1/2 inches across aging to orange, opening in the evening; densely hairy sepals.
Bloom Period: June to September.
Fruit: Narrowly lanceolate-cylindrical, hairy capsules, 3/4 to 1-3/8 inches long and less than 1/4-inch wide.
References: "Flora of Colorado" by Jennifer Ackerfield, SEINet and E-Flora BC.
BONAP Distribution Map

Colorado Status:
Native




© Tom Lebsack 2021