Flora of North America species comparison

ascending to erect, unbranched or well-branched at base and distally, 15–100 cm.

many, erect, 4–60 cm.

in a basal rosette and cauline, basal 3–15 × 0.5–1 cm, blade lyrate;

cauline 1–9 × 0.1–0.8 cm, blade linear to very narrowly elliptic or narrowly lanceolate, margins sinuate-dentate to subentire.

in a basal rosette and cauline, basal 2–9 × 0.3–3.2 cm, blade oblanceolate to obovate, margins subentire or sinuate-pinnatifid;

cauline 1–10 × 0.3–3.5 cm, blade narrowly elliptic to ovate, margins subentire or serrulate to sinuate-pinnatifid.

sharply nodding.

4-merous, zygomorphic, opening at sunset;

floral tube 6–10 mm;

sepals 6–12 mm;

petals white, fading pink to red, narrowly obovate, 5.5–9.5 mm, short-clawed;

filaments 4–6 mm, anthers 2–3 mm, pollen 90–100% fertile;

style 11–19 mm, stigma surrounded by anthers at anthesis.

1–3 opening per day near sunrise in some populations, near sunset in others;

buds with free tips 0–4 mm;

floral tube 12–25 mm;

sepals 15–50 mm;

petals pink to rose, fading darker, or white, fading pink, 15–45 mm;

filaments 10–22 mm, anthers 6–16 mm, pollen 85–100% fertile;

style 20–55 mm, stigma exserted beyond anthers at anthesis.

ellipsoid or narrowly obovoid, narrowly 4-winged, furrowed between wings, 6–8 × 2–3 mm, narrowed at base, stipe 0 mm;

sessile.

narrowly obovoid to narrowly rhombic-ellipsoid, angled, 10–25 × 3.5–6 mm, apex attenuate to a sterile beak, valve midrib prominent, proximal stipe cylindrical, not tapering to base, (4–)8–15 mm;

sessile.

4, yellowish to reddish brown, 2–3 × 1–1.5 mm.

narrowly obovoid, 1–1.2 × 0.5–0.6 mm.

= 14.

= 14, 28, 42.