Flora of North America species comparison

erect, several-branched near ground, also branched proximal to inflorescences, 60–280 cm.

15–50 cm.

in a basal rosette and cauline, 0.5–8 × 0.15–2 cm, sessile, blade narrowly lanceolate or oblanceolate to very narrowly elliptic or linear, margins usually subentire or shallowly sinuate-dentate, sometimes deeply sinuate-dentate, often undulate.

2.5–10 × 0.6–2.5 cm;

petiole 0.2–2.2 cm;

blade usually lanceolate to oblanceolate, sometimes elliptic, margins weakly serrate to sinuate-pinnatifid.

slender.

4-merous, zygomorphic, opening near sunset;

floral tube 1.5–5 mm;

sepals 6–14 mm;

petals white, fading pink to red, slightly unequal, elliptic, 7–13 mm, clawed;

stamens presented in lower 1/2 of flower, filaments 4.5–11 mm, anthers 2–4.5 mm, pollen 90–100% fertile;

style 9–19 mm, stigma exserted beyond anthers at anthesis.

1–3 opening per day near sunset;

buds with free tips 0.5–3 mm;

floral tube 10–30 mm;

sepals 20–40 mm;

petals white, fading pink, 20–43 mm;

filaments 12–18 mm, anthers 5–10 mm, pollen 85–100% fertile;

style 19–67 mm, stigma exserted beyond anthers at anthesis.

lanceoloid to narrowly ovoid, 4-winged, 9–19 × 1–3.5 mm, abruptly constricted to a long, sterile stipe 2–10 mm.

broadly clavate or obovoid, 20–51 × 5–7 mm, winged, wings 2–4 mm, valve surface with prominent midrib, proximal stipe 8–45 mm;

sessile.

(1 or)2–4, 2–3(–4) × 0.8–1.3 mm, yellowish to light brown or rarely reddish brown.

narrowly obovoid, 1–1.5 × 0.5–0.7 mm.

= 14.