Flora of North America species comparison

erect, branched below and just above ground, branched also proximal to inflorescences, (40–)60–250 cm.

ascending to erect, 1–several from base, these unbranched to well-branched, 10–60 cm.

in a basal rosette and cauline, basal 3–13 × 0.6–2.5 cm, blade spatulate to oblanceolate, cauline (1–)2.5–12 × 0.1–1 cm, blade linear to narrowly oblanceolate, margins slightly to conspicuously sinuate-dentate.

in a weakly developed basal rosette and cauline, 2–7 × 0.2–1.5 cm, axillary fascicles of reduced leaves often present;

blade oblanceolate to oblong, margins usually pinnatifid, sometimes proximal ones coarsely few-toothed.

slender.

4-merous, zygomorphic, opening near sunset;

floral tube 3–9 mm;

sepals 6–12 mm;

petals white, fading dark pink to red, slightly unequal, elliptic-obovate, 7–11 mm;

stamens presented in lower 1/2 of flower, filaments 3–7 mm, anthers 2.5–5 mm, pollen 90–100% fertile;

style 9.5–19 mm, stigma exserted beyond anthers at anthesis.

1–3 opening per day near sunset;

buds nodding, weakly quadrangular, without free tips;

floral tube 10–25 mm, mouth conspicuously pubescent, closed with straight, white hairs, 1–2 mm;

sepals 10–20 mm;

petals white, fading pink, ovate or shallowly obcordate, 10–15(–20) mm;

filaments 10–15 mm, anthers 4–7 mm;

style 17–42 mm, stigma exserted beyond anthers at anthesis.

lanceoloid to narrowly ovoid, narrowly 4-winged, 7–12 × 1.5–2.5 mm, tapered to a sterile stipe 2–5 mm.

ascending to erect, straight, fusiform, weakly 4-angled, 10–20 × 3–5 mm, dehiscent 1/2 their length;

sessile.

(2 or)3 or 4(or 5), light brown or reddish brown, 1.5–2.5 × 0.8–1.3 mm.

in 2 rows per locule, ellipsoid to subglobose, 1.5–2 × 1.2–1.5 mm, surface regularly pitted, pits in longitudinal lines.

= 14.

= 14, 28.