Flora of North America species comparison

1–several, ascending to erect, unbranched to densely branched, 15–70 cm.

erect, usually branched several cm belowground or from near base, sometimes also branched distally, 20–60(–100) cm.

1–3.5 × 0.1–0.7 cm, fascicles of small leaves 0.2–2.5 cm present in non-flowering axils;

petiole 0 cm;

blade narrowly lanceolate, base acute-attenuate, margins entire or obscurely and sparsely serrulate, not undulate, apex acute.

in a basal rosette and cauline, basal 2–4 × 0.4–0.8 cm, petiole0–0.4 cm, blade narrowly oblanceolate to narrowly spatulate;

cauline 0.5–5 × 0.1–0.8 cm, petiole 0–0.3 cm, blade narrowly lanceolate or very narrowly elliptic, margins subentire or sinuate-denticulate.

usually 1 per stem opening per day at sunset;

buds with free tips 2–9(–12) mm;

floral tube (15–)30–60(–70) mm, funnelform in distal 1/2 or less;

sepals 10–25 mm;

petals yellow, fading pale pink or pale purple, 10–20 mm;

filaments 4–12 mm, anthers 6–10 mm, pollen 85–100% fertile;

style 35–70(–80) mm, stigma yellow, quadrangular, usually exserted beyond anthers.

4-merous, nearly actinomorphic, opening near sunset;

floral tube 9–13 mm;

sepals 7–9 mm;

petals white, fading pink to pale red, slightly unequal, rhombic, 7–8 mm, short-clawed;

filaments 3–4 mm, anthers 4–5 mm, pollen 85–100% fertile;

style 18–22 mm, stigma exserted beyond anthers at anthesis.

10–50 × 1.5–4 mm, somewhat papery, promptly dehiscent in distal 1/2.

erect, fusiform, often slightly curved, weakly 4-angled, (9–)13–17 × 2–3 mm, valves with inconspicuous raised midrib;

sessile.

obovoid, 2–3 mm.

(1–)3 or 4, yellowish or light brown, 2–3.5 × 1–2 mm.

= 14.

= 14.