Flora of North America species comparison

ascending or becoming decumbent, usually unbranched.

(when present) ascending, longer ones becoming decumbent, usually densely leafy, 0–20(–36) cm.

in a basal rosette, often also cauline, (2.8–)5–21(–34) cm;

blade margins entire, dentate, or pinnatifid.

in a basal rosette, sometimes also cauline, (3.1–)5–21(–34) × (0.3–)1.5–3.5(–5.3) cm;

petiole (0.8–)2.5–11(–15) cm;

blade usually lanceolate to elliptic, rhombic-obovate, sometimes suborbicular or linear, usually irregularly pinnatifid, some sinuses extending nearly to midrib, usually with a large terminal lobe (0.1–)1.5–2(–2.4) cm, margins erose, apex acute to obtuse or rounded.

solitary flowers in axils of distal leaves.

opening near sunset, with sweet scent or nearly unscented;

buds erect, quadrangular, with free tips;

floral tube (21–)35–210(–220) mm;

sepals splitting along one suture, remaining coherent and reflexed as a unit at anthesis;

petals yellow, fading yellow, orange, pink, or deep red, obovate to rhombic-obovate;

stigma deeply divided into 4 linear lobes.

usually 1–3, rarely more, opening per day near sunset, weakly scented;

buds with unequal free tips 1–7 mm;

floral tube (90–)120–210(–220) mm;

sepals 38–55 mm;

petals pale yellow to yellow, fading pale orange to pink, drying lavender to purple, usually broadly rhombic-obovate, sometimes obovate, (38–)45–58(–62) mm, distal margin usually erose;

filaments (16–)20–32 mm, anthers (8–)13–21 mm;

style (123–)155–240(–255) mm, stigma exserted beyond anthers at anthesis.

papery, leathery, or corky in age, ovoid, narrowly lanceoloid to broadly ellipsoid, or globose, winged, wings 10–32 mm wide throughout, or capsule walls with corky thickening and wings not developed (sometimes in O. brachycarpa), then capsule appearing only 4-angled, apex truncate to cuneate, dehiscent 1/4–1/3 their length;

pedicellate, sometimes disarticulating from plant at maturity.

leathery or corky, ovoid to narrowly ellipsoid, ± winged, wings 0–3(–5) mm wide, sometimes capsule with corky thickening between wings, then capsule only 4-angled, body (12–)18–40 × 6–10 mm, dehiscent 1/4 their length;

pedicel 0–3 mm.

numerous, in 1 or 2 rows per locule, grayish to yellowish brown, brown, or dark purplish brown, obovoid or subcuboid, angled or rounded, usually with an erose wing distally, surface coarsely rugose and reticulate, thickened, especially at distal end, this area with an internal cavity adjacent to embryo.

usually numerous, in 1 or 2 rows per locule, obovoid to subcuboid, 3–5 × 1.8–2.2 mm.

= 14, 28, 42, 56.

= 14.