Oenothera sect. Contortae

W. L. Wagner

Ann. Missouri Bot. Gard. 73: 478. 1986.

Treatment appears in FNA Volume 10.

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.

Distribution

w United States

Discussion

Species 1.

Selected References

None.

"/3" is not declared as a valid unit of measurement for this property."thin" is not a number.

... more about "Oenothera sect. Contortae"
slender +
Warren L. Wagner +
W. L. Wagner +
pale green +  and yellow usually fading orange purple pale-yellow reddish or whitish +
pedicel-like +
indehiscent +  and loculicidal +
quadrangular +
sessile +  and twisted +
curved +  and straight +
tapering +, 4-angled +  and lanceoloid +
w United States +
whitish +  and green +
exfoliating +
basifixed +  and versatile +
0.03 cm0.3 mm <br />3.0e-4 m <br /> - 0.05 cm0.5 mm <br />5.0e-4 m <br /> +
4.5 cm45 mm <br />0.045 m <br /> - 5.5 cm55 mm <br />0.055 m <br /> +
hispid +, lanate +  and glabrous +
2.7 cm27 mm <br />0.027 m <br /> - 4.5 cm45 mm <br />0.045 m <br /> +
zygomorphic +  and actinomorphic +
curved +  and straight +
indehiscent +  and dehiscent +
4-angled +, terete +, tapering +, cylindrical +, ellipsoid +, clavate +, ovoid ellipsoid +  and cylindrical rhombic-obovoid or globose +
acaulescent +
perennial +
suffrutescent +
nodding +  and erect +
4 cm40 mm <br />0.04 m <br /> - 6.2 cm62 mm <br />0.062 m <br /> +
deciduous +
basal +  and cauline +
2.6 cm26 mm <br />0.026 m <br /> - 4 cm40 mm <br />0.04 m <br /> +
pedicellate +  and sessile +
1 +  and 8 +
salmon red +, fading +  and yellow +
obcordate +
Ann. Missouri Bot. Gard. +
basal +  and cauline +
2 +  and 1 +
clavate +  and globose +
sculptured +  and smooth +
obovoid +
reduced +
in pairs +  and separating +
purple +, pink +, red +  and green +
deciduous +
parietal +, axile +  and placentation +
unequal +
aquatic +, amphibious +  and terrestrial +
in 2 unequal series +  and subequal +
2 times as many or as many as sepals +
ascending +  and erect +
petiolate +  and sessile +
intrapetiolar +
pubescent +  and glabrous +
aquatic +, amphibious +  and terrestrial +
smooth +, reticulate +  and furrowed +
Oenothera sect. Contortae +
Oenothera +
section +
3 - -5-aperturate +
woody +  and hard +
smooth +  and erose +
papillate +