Flora of North America species comparison

1–many, erect to ascending, unbranched to densely branched, 4–60 cm.

erect or ascending, single to several from base, unbranched or many-branched throughout, 10–50(–70) cm.

0.3–6.5 × 0.04–1.2 cm, sometimes fascicles of small leaves 0.1–1.5 cm present in non-flowering axils;

petiole 0–0.2 cm;

blade elliptic, lanceolate, linear, or filiform to ovate or oblanceolate, usually not much reduced distally, proximalmost leaves sometimes obovate to spatulate, base attenuate to obtuse, truncate, or subcordate, sometimes clasping, margins entire or serrate, often undulate, apex acute.

cauline, rosette usually weakly developed or absent, at least during flowering, sometimes well developed, 1–5(–7.8) × 0.3–1(–1.5) cm;

petiole 0–2(–4.5) cm;

blade lanceolate, oblong, linear-lanceolate, or ovate, margins subentire or remotely denticulate, deeply sinuate-dentate, or pinnatifid, sometimes repand.

usually 1 per stem opening per day in afternoon or near sunset;

buds with free tips 0.5–6 mm;

floral tube 16–50(–60) mm, funnelform in distal 1/2 or less;

sepals 7–28 mm;

petals yellow, fading pale pinkish or pale purple, 10–35 mm;

filaments 4–13 mm, anthers 5–13 mm, pollen 85–100% fertile;

style 25–65(–75) mm, stigma yellow, quadrangular, usually exserted beyond anthers.

1–several opening per day near sunset;

buds nodding, weakly quadrangular, with free tips 0–2 mm;

floral tube 15–40 mm;

sepals 10–30 mm, not spotted;

petals white, fading pink to deep pink, broadly obovate or obcordate, (10–)15–25(–40) mm;

filaments 9–15 mm, anthers 3–10 mm;

style 25–55 mm, stigma exserted beyond anthers at anthesis.

6–40 × 2–4 mm, hard, promptly dehiscent throughout their length.

spreading to reflexed, straight to curved or contorted, cylindrical, obtusely 4-angled, tapering slightly from base to apex, 15–60 × 1.5–2.5 mm;

sessile.

obovoid, 1–2.5 mm.

numerous, in 1 row per locule, brownish with dark spots or black, narrowly obovoid, 1.5–2.2 mm.

= 14, 28.