Flora of North America species comparison

unbranched or with many ascending branches arising near base, erect, 10–50 cm.

usually well-branched, 25–120 cm.

in a basal rosette and cauline, basal 1–2(–4) × 0.2–0.6 cm, petiole 0.2–1(–1.5) cm, blade ovate to obovate or narrowly elliptic;

cauline 1–4 × less than 0.1 cm, sessile, blade linear or filiform.

in a basal rosette and cauline, basal 7–11 × 0.1–2.3 cm, blade lyrate;

cauline 1–9.5 × 0.1–2.3 cm, blade narrowly lanceolate to linear, margins sinuate-dentate, undulate.

usually 1–3 opening per day near sunrise;

buds without free tips;

sepals 1.5–2 mm;

petals bright yellow, fading pink, obcordate to obovate, 3–5(–7) mm;

filaments 1–2 mm, anthers 0.5–1 mm;

style 1–2 mm, stigma surrounded by anthers at anthesis.

4-merous, zygomorphic, opening at sunset;

floral tube 6.5–14 mm;

sepals 11–21 mm;

petals white, fading pink to red or sometimes purple, elliptic-obovate, 10–15 mm;

filaments 6–9 mm, anthers 2–6 mm, pollen 90–100% fertile;

style 16–32 mm, stigma exserted beyond anthers at anthesis.

ellipsoid-rhombic to subglobose, 4-angled, 4–6(–10) × 1.5–3 mm, stipe 0–4 mm, valve midrib raised at distal end, indehiscent or tardily dehiscent distally;

sessile.

ovoid, narrowly 4-winged, furrowed between angles, 4.5–8 × 2–5 mm, abruptly tapering to stipe 0–1 mm;

sessile.

clustered in each locule, ovoid, surface minutely papillose, 1 × 0.5 mm.

(1 or)2–4(or 5), yellowish to light brown, 2–3 × 1 mm.

= 14.

= 14.