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FNA | Family List | FNA Vol. 10 | Onagraceae | Oenothera

17m. Oenothera Linnaeus sect. Contortae W. L. Wagner, Ann. Missouri Bot. Gard. 73: 478. 1986.

Herbs perennial, acaulescent; from a thick, fleshy taproot. Leaves in a basal rosette, 2.6–4(–6.2) cm; blade margins pinnately lobed, lateral lobes often greatly reduced. Inflorescences solitary flowers in axils of leaves. Flowers opening near sunset, with strong, sweet scent; buds erect, quadrangular, without free tips; floral tube 27–45(–55) mm; sepals separating individually or in pairs; petals intensely yellow, fading deep salmon red, obcordate; stigma deeply divided into 4 linear lobes. Capsules moderately thin and flexible, lanceoloid, often contorted and twisted, 4-angled, gradually tapering to a long, slender, sterile apex, dehiscent 2/3–3/4 their length; sessile. Seeds numerous, in 1 row per locule, often forming 2 rows near base of capsule, obovoid, surface coarsely rugose, with turgid and collapsed papillae. 2n = 14.

Species 1: w United States.


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