Flora of North America species comparison

erect or ascending, unbranched or branched, 30–60 cm.

usually well-branched from base and distally, rarely unbranched, 15–65(–85) cm.

in a basal rosette and cauline, rosette weakly developed or absent, at least during flowering, 3–9 × (0.6–)1–2.5 cm;

petiole 0–2 cm;

blade oblong to lanceolate or narrowly ovate, margins irregularly sinuate-dentate.

in a basal rosette and cauline, basal 6–9.5 × 1–2 cm, blade lyrate;

cauline 1–7 × 0.1–2.3 cm, blade narrowly lanceolate to oblanceolate, margins shallowly sinuate-denticulate to subentire.

1–several opening per day near sunset;

buds nodding, weakly quadrangular, with free tips 0.5–4 mm;

floral tube 30–50 mm;

sepals 20–30 mm, not spotted;

petals white, fading pink, broadly obovate, 20–30 mm;

filaments 10–15 mm, anthers 8–15 mm;

style 50–70 mm, stigma exserted beyond anthers at anthesis.

(3- or)4-merous, zygomorphic, opening at sunset;

floral tube 6–12 mm;

sepals 10–15 mm;

petals white, fading pink to purple, elliptic-obovate, 8–13 mm;

filaments 5–8 mm, anthers 2–4 mm, pollen 90–100% fertile;

style 15–24 mm, stigma exserted beyond anthers at anthesis.

erect or strongly ascending, not woody, straight or slightly curved, subcylindrical, obtusely 4-angled, tapering gradually from base to apex, 20–30 × 2–3 mm;

sessile.

ellipsoid, narrowly (3- or)4-winged, deeply furrowed between wings, 6–10 × 2–3 mm, with or without prominent lower corners, narrowed to a stipe 0–1 mm;

sessile.

numerous, in 1 row per locule, dark brown, narrowly obovoid, 1.5 mm.

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

= 14.

= 14.