Flora of North America species comparison

usually unbranched, sometimes several-branched from base, 60–180 cm.

in a basal rosette and cauline, 0.8–13 × 0.1–1.6 cm;

blade often red-blotched, narrowly lanceolate to narrowly oblanceolate, margins slightly to conspicuously sinuate-dentate.

3 or 4-merous, often mixed on a single plant, zygomorphic, opening near sunset;

floral tube 3–8 mm;

sepals 2.5–8 mm;

petals white, fading pink, narrowly elliptic-obovate, 4.5–8 mm;

filaments 2.5–6 mm, anthers 0.5–2 mm, pollen 90–100% fertile;

style 7.5–19 mm, stigma surrounded by or slightly exserted beyond anthers.

ellipsoid or ovoid, 3-(or 4-)angled, 5–9 × 2–3 mm;

sessile.

2–4, yellowish to light brown, 1.2–2.3 × 0.8–1.1 mm.

= 14.