Flora of North America species comparison

erect to ascending, usually unbranched, or with arcuate lateral branches arising from rosette, 15–40(–60) cm.

in a basal rosette and cauline, basal 6–10 × 1–2.5 cm, cauline 3–7.5 × 0.8–2 cm;

blade usually grayish green, narrowly oblanceolate to narrowly oblanceolate, margins deeply lobed, lobes usually dentate;

bracts distalmost erect, revolute.

usually 1 opening per day near sunset;

buds erect, with free tips erect or appressed, 0.5–2.5 mm;

floral tube 23–28 mm;

sepals 5–12 mm;

petals yellow, fading orange, broadly obovate or shallowly obcordate, 6–15 mm;

filaments 4–12 mm, anthers 3–4 mm, pollen 85–100% fertile;

style 27–40 mm, stigma surrounded by anthers at anthesis.

cylindrical, sometimes slightly enlarged toward apex, 25–45 × 2.5–3 mm.

ellipsoid to subglobose, 0.8–1.2 × 0.3–0.5 mm.

= 14.