Flora of North America species comparison

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

1–several, ascending to erect, unbranched to densely branched, 15–70 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.

1–3.5 × 0.1–0.7 cm, fascicles of small leaves 0.2–2.5 cm present in non-flowering axils;

petiole 0 cm;

blade narrowly lanceolate, base acute-attenuate, margins entire or obscurely and sparsely serrulate, not undulate, apex acute.

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.

usually 1 per stem opening per day at sunset;

buds with free tips 2–9(–12) mm;

floral tube (15–)30–60(–70) mm, funnelform in distal 1/2 or less;

sepals 10–25 mm;

petals yellow, fading pale pink or pale purple, 10–20 mm;

filaments 4–12 mm, anthers 6–10 mm, pollen 85–100% fertile;

style 35–70(–80) mm, stigma yellow, quadrangular, usually exserted beyond anthers.

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

sessile.

10–50 × 1.5–4 mm, somewhat papery, promptly dehiscent in distal 1/2.

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

obovoid, 2–3 mm.

= 14.

= 14.