Flora of North America species comparison

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

ascending to erect, 1–several from base, these unbranched to well-branched, 10–60 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 weakly developed basal rosette and cauline, 2–7 × 0.2–1.5 cm, axillary fascicles of reduced leaves often present;

blade oblanceolate to oblong, margins usually pinnatifid, sometimes proximal ones coarsely few-toothed.

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.

1–3 opening per day near sunset;

buds nodding, weakly quadrangular, without free tips;

floral tube 10–25 mm, mouth conspicuously pubescent, closed with straight, white hairs, 1–2 mm;

sepals 10–20 mm;

petals white, fading pink, ovate or shallowly obcordate, 10–15(–20) mm;

filaments 10–15 mm, anthers 4–7 mm;

style 17–42 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.

ascending to erect, straight, fusiform, weakly 4-angled, 10–20 × 3–5 mm, dehiscent 1/2 their length;

sessile.

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

in 2 rows per locule, ellipsoid to subglobose, 1.5–2 × 1.2–1.5 mm, surface regularly pitted, pits in longitudinal lines.

= 14.

= 14, 28.