Flora of North America species comparison

erect to ascending, usually unbranched, 10–40 cm.

ascending, usually well-branched from base and distally, rarely unbranched, 15–60 cm.

in a basal rosette and cauline, basal 5–12 ×1.3–3.5 cm, cauline 2–8.5 ×1–3 cm;

blade green, narrowly oblanceolate to narrowly elliptic or narrowly lanceolate, margins usually dentate to pinnatifid, sometimes subentire;

bracts spreading, flat.

in a basal rosette and cauline, 1.5–8 × 0.2–0.6(–1.5) cm, blade very narrowly elliptic to oblanceolate or oblong-elliptic, margins entire or weakly sinuate-dentate.

usually 1 opening per day near sunset;

buds erect, with free tips erect, 0.5–2 mm;

floral tube 25–40 mm;

sepals 10–22 mm;

petals yellow, fading orange or reddish tinged, broadly obovate or shallowly obcordate, 13–25 mm;

filaments 10–17 mm, anthers 4–5 mm, pollen 85–100% fertile;

style 35–50 mm, stigma slightly exserted beyond anthers at anthesis.

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

floral tube 4–5.5 mm;

sepals 4.5–6 mm;

petals white, fading pink, elliptic-obovate, 3.5–5 mm;

filaments 2–3.5 mm, anthers 1.5–3 mm, pollen 35–65% fertile;

style 9–10 mm, stigma surrounded by anthers.

cylindrical, sometimes slightly enlarged toward apex, 20–45 × 2–2.5 mm.

narrowly obovoid, 3(or 4)-winged, furrowed between wings, 7–9 × 3–5 mm, narrowed at base;

sessile.

ellipsoid, 0.8–1.4 × 0.3–0.6 mm.

(1 or)2–5, yellowishto light brown, 1.5–3.5 × 1–1.5 mm.

= 14.

= 14.