Flora of North America species comparison

erect, unbranched or with few, spreading branches, 30–50(–80) cm.

usually well-branched distal to base, 50–180 cm.

in a basal rosette and cauline, rosette weakly developed or absent, at least during flowering, (1–)2–6(–8) × 1–2(–3) cm;

sessile;

blade lanceolate to oblong lanceolate, proximal ones sometimes oblanceolate, margins coarsely repand-dentate or -pinnatifid.

in a basal rosette and cauline, basal 8–20 × 1.5–3 cm, blade oblanceolate, margins irregularly toothed to lobed;

cauline 1.5–12 × 0.5–3 cm, blade narrowly elliptic to elliptic or lanceolate, margins subentire or undulate-denticulate.

1–several opening per day near sunset;

buds nodding, weakly quadrangular, without free tips;

floral tube 20–30 mm;

sepals 13–21 mm, not spotted or with scattered small, maroon spots;

petals white, fading pink, broadly obovate or obcordate, 15–30 mm;

filaments 14–16 mm, anthers 6–8 mm;

style 40–50 mm, stigma exserted beyond anthers at anthesis.

4-merous, zygomorphic, opening at sunset;

floral tube 6–13 mm;

sepals 5–13 mm;

petals white, fading pink to red, narrowly elliptic-obovate, 6–12 mm;

filaments 5–10 mm, anthers 2–4 mm, pollen 35–65% fertile;

style 12–15 mm, stigma surrounded by anthers.

widely spreading, woody in age, straight or slightly curved, cylindrical, obtusely 4-angled, especially toward base, tapering gradually from base to apex, 30–60 × 2–3 mm;

sessile.

ellipsoid, 4-angled, 5–9 × 2–3 mm;

sessile.

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

3–6, light to reddish brown, 2–2.5 × 1–1.3 mm.

= 14.

= 14.