Flora of North America species comparison

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

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

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 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.

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

sessile.

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

sessile.

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