Flora of North America species comparison

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

several to many, decumbent to ascending, branched, 4–20(–30) 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.

0.6–5 × 0.08–0.6 cm, fascicles of small leaves 0.2–1 cm often present in non-flowering axils;

petiole 0 cm;

blade narrowly lanceolate or narrowly oblanceolate, base attenuate to truncate, sometimes clasping, margins entire or subentire, sometimes revolute, sometimes weakly undulate, apex acute to obtuse.

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 near sunset;

buds with free tips 0.3–3 mm;

floral tube 25–60 mm, funnelform in distal 1/2 or less;

sepals 8–20 mm;

petals yellow, fading pale pink or pale purple, 12–28 mm;

filaments 6–12 mm, anthers 5–11 mm, pollen 85–100% fertile;

style 30–75 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.

6–25 × 1–3 mm, hard, promptly dehiscent throughout their length.

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

obovoid, 1.5–2.5 mm.

= 14.

= 14.