Flora of North America species comparison

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

many, ascending to erect, branched from base, 15–30(–40) 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.

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

petiole 0–0.1 cm;

blade linear to narrowly linear-lanceolate, folded lengthwise, base long-attenuate, margins subentire or serrulate, apex acute.

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.

opening near sunrise;

buds with free tips 0–0.5 mm;

floral tube 7 mm;

sepals 4–6 mm, midribs keeled;

petals yellow, fading yellow to orange, 15–20 mm; antisepalous filaments 5 mm, antipetalous filaments 2 mm, anthers 3–4 mm, pollen 90–100% fertile;

style 10 mm, stigma discoid to quadrangular, exserted beyond anthers at anthesis.

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

18–20 × 2 mm, hard, dehiscent 1/2 their length, often tardily dehiscent throughout their length.

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

oblanceoloid, 1–1.8 mm, sharply angled, apex truncate.

= 14.

= 14.