Flora of North America species comparison

ascending, branched below or just above ground, branched also proximal to inflorescences, 30–70(–120) cm.

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

in a basal rosette and cauline, basal 3–17 × 0.8–2 cm, blade oblanceolate, cauline 1–6.5 × 0.1–1.5 cm, sessile, blade narrowly oblanceolate to elliptic, margins conspicuously sinuate-dentate, often undulate.

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 2–3.5 mm;

sepals 6–12 mm;

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

stamens presented in lower 1/2 of flower, filaments 5–9 mm, lanate at very base, anthers 2–4 mm, pollen 90–100% fertile;

style 9–16 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.

reflexed, lanceoloid to narrowly ovoid, narrowly 4-winged, 8–19 × 1.5–2 mm, tapering to a sterile stipe 3–9 mm.

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

sessile.

(1 or)2–4, 2–3 × 1 mm, yellowish to reddish brown.

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.