Flora of North America species comparison

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Oenothera sect. Paradoxus
Habit Herbs perennial, caulescent; from a taproot, lateral roots producing adventitious shoots.
Stems

weakly erect becoming decumbent, branched or unbranched.
Leaves

in a basal rosette and cauline, 1–5 cm;

blade margins pinnately lobed to sinuate-toothed or dentate.
Inflorescences

solitary flowers in axils of distal leaves.
Flowers

opening near sunset;

buds erect, terete, with free tips coherent;

floral tube (37–)45–60(–65) mm;

sepals splitting along one suture, reflexed as a unit to one side;

petals lemon-yellow, fading orange-red to reddish purple, usually elliptic, sometimes oblanceolate;

stigma deeply divided into 4 linear lobes.
Capsules

hard and woody, narrowly ovoid to ovoid, 4-angled, apex tapering to a short, sterile beak, valves with prominent midrib and capsule appearing 8-ribbed, tardily dehiscent 1/3 their length;

sessile.
Seeds

numerous, in 1 or 2 partially overlapping rows per locule, asymmetrically cuneiform to rhombic, irregularly angled, surface minutely beaded.
2n

= 14, 28.

Oenothera sect. Paradoxus
Distribution
sw United States; sc United States; n Mexico
Discussion

Species 1.

Section Paradoxus consists of a single species, restricted to the Chihuahuan Desert.

(Discussion copyrighted by Flora of North America; reprinted with permission.)
Source FNA vol. 10.
Parent taxa Onagraceae > subfam. Onagroideae > tribe Onagreae > Oenothera
Subordinate taxa
Name authority W. L. Wagner: Ann. Missouri Bot. Gard. 71: 1122. (1985)
Web links 
Unless otherwise noted, all data comes from the online version of the Flora of North America, who have made most of their content available via a Creative Commons license (CC BY 4.0).



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