Flora of North America species comparison

ascending to erect, with decumbent branches, thickened at base, tapering toward apex, 10–35(–60) cm.

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

in a basal rosette and cauline, basal 5–10(–26) × 0.6–1.5(–3.5) cm, cauline 5–8(–15.5) × 1–2 cm;

petiole 0–12 cm;

blade lanceolate to oblanceolate, margins pinnatifid or sometimes coarsely serrate.

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, without free tips;

floral tube 26–31 mm;

sepals 19–26 mm, conspicuously maroon-spotted, each spot at base of a long hair;

petals white, fading pink to deep pink, broadly obovate or obcordate, 16–26(–36) mm;

filaments 9–15 mm, anthers 7–9 mm;

style 45–50 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.

spreading, woody in age, curved upward, or distal end recurved, cylindrical, obtusely 4-angled, especially toward base, tapering gradually from base to apex, 30–80 × 2.5–3.5 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, light brown to yellowish brown with dark purple splotches, obovoid, 1.6–2 mm.

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

= 14.

= 14.