Oenothera subsect. Calylophus

(Spach) W. L. Wagner & Hoch

Syst. Bot. Monogr. 83: 147. 2007.

Basionym: Calylophus spach Hist. Nat. Vég. 4: 349. 1835
Treatment appears in FNA Volume 10.

Herbs perennial, short-lived or suffrutescent, or annual. Leaves: blade margins subentire or serrulate or spinulose-serrate. Flowers usually crowded near stem apex; buds quadrangular; floral-tube 2–20 mm; sepals with keeled midrib; stamens in 2 unequal series, antisepalous set conspicuously longer, pollen 30–100% fertile. Capsules hard, straight or, sometimes, slightly recurved, tardily dehiscent 1/2 to throughout their length. Seeds obovoid or oblanceoloid, sometimes sharply angled. 2n = 14.

Distribution

w, c North America, n Mexico

Discussion

Species 3 (3 in the flora).

Subsection Calylophus consists of three species (four taxa), one of which (Oenothera capillifolia) occurs primarily in Texas, but extends to southeastern Colorado, southern Kansas, southern Louisiana, and northeastern Mexico, and is disjunct in northwestern New Mexico; O. serrulata occurs throughout the Great Plains to Alberta, Manitoba, and Saskatchewan east to Wisconsin, west to east-central Arizona, with one occurrence in Chihuahua, Mexico, at elevations 0–1800(–2100) m. Species of subsect. Calylophus have diurnal flowers.

Selected References

None.

Key

1 Petals 5–12(–20) mm; stigmas surrounded by anthers at anthesis; pollen 30–60(–80)% fertile. Oenothera serrulata
1 Petals 6–25 mm; stigmas exserted beyond anthers at anthesis; pollen 90–100% fertile. > 2
2 Leaves (0.1–)0.3–1 cm wide; stems (10–)25–80 cm, 1–many, unbranched to moderately branched, weakly decumbent to erect; sepals 4–12 mm; floral tube 5–20 mm; petals 6–25 mm. Oenothera capillifolia
2 Leaves 0.1–0.2 cm wide; stems 15–30(–40) cm, many, branched from base, ascending to erect; sepals 4–6 mm; floral tube 7 mm; petals 15–20 mm. Oenothera gayleana

"/2" is not declared as a valid unit of measurement for this property."thin" is not a number.

Warren L. Wagner +
(Spach) W. L. Wagner & Hoch +
pale green +  and yellow usually fading orange purple pale-yellow reddish or whitish +
pedicel-like +
Calylophus spach +
indehiscent +  and loculicidal +
spinulose +, serrulate +  and serrate +
serrulate or spinulose-serrate +  and subentire +
quadrangular +
, +  and straight +
tapering +, cylindrical +  and obtusely 4-angled +
w +, c North America +  and n Mexico +
gray +  and brown +
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 />) +
6 cm60 mm <br />0.06 m <br /> (7 cm70 mm <br />0.07 m <br />) +
hispid +, lanate +  and glabrous +
0.2 cm2 mm <br />0.002 m <br /> (2 cm20 mm <br />0.02 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 +
annual +, short-lived +  and perennial +
suffrutescent +
nodding +  and erect +
deciduous +
0.3 cm3 mm <br />0.003 m <br /> (9 cm90 mm <br />0.09 m <br />) +
pedicellate +  and sessile +
1 +  and 8 +
pale-purple +, pale-pink +, orange +, yellow +  and fading dark +
suborbiculate +  and rhombic or obcordate +
Syst. Bot. Monogr. +
basal +  and cauline +
clavate +  and globose +
sculptured +  and smooth +
angled +, oblanceoloid +  and obovoid +
reduced +
purple +, pink +, red +  and green +
deciduous +
with keeled midribs +  and flat +
parietal +, axile +  and placentation +
unequal +
aquatic +, amphibious +  and terrestrial +
in 2 unequal series +  and subequal +
2 times as many or as many as sepals +
unbranched +  and branched +
decumbent +  and ascending or erect +
blue-black +, usually yellow +  and yellow-green +
4-lobed +, discoid +  and quadrangular +
petiolate +  and sessile +
intrapetiolar +
pubescent +  and glabrous +
aquatic +, amphibious +  and terrestrial +
smooth +, reticulate +  and furrowed +
rugose +, papillose +  and non-papillate +
Oenothera +
Oenothera subsect. Calylophus +
Oenothera sect. Calylophus +
subsection +
3(-5)-aperturate +
woody +  and hard +
smooth +  and erose +
papillate +