Flora of North America species comparison

erect to ascending, unbranched to much branched, 5–50 cm.

(when present) 1–several, ascending, usually unbranched, 2–4 cm.

in a basal rosette and cauline, basal 4–15 × 1–3 cm, cauline 2–10 × 0.5–3.5 cm;

blade green, narrowly oblanceolate to narrowly elliptic or narrowly oblong, margins usually dentate or deeply lobed;

bracts spreading, flat.

primarily in a basal rosette, sometimes also cauline, (0.5–)2.5–13(–19.5) × (0.2–)0.6–2.3(–2.7) cm;

petiole 0.5–5.2 cm;

blade oblanceolate to elliptic-oblanceolate (in some exceptionally large leaves), margins lyrate-pinnatifid to subentire (in very small ones), apex usually rounded, rarely acute.

usually 1 opening per day near sunset;

buds erect, with free tips erect, 0.3–3 mm;

floral tube 12–35 mm;

sepals 5–15 mm;

petals yellow, fading orange or reddish tinged, broadly obovate or obcordate, 5–22 mm;

filaments 3–14 mm, anthers 4–5 mm, pollen ca. 50% fertile;

style 20–50 mm, stigma surrounded by anthers at anthesis.

1–3(–10) per stem opening per day near sunset, without noticeable scent;

buds sometimes ± recurved before anthesis;

floral tube (20–)30–37(–47) mm;

sepals 4.5–12 mm;

petals white, fading pale pink, (6.5–)8–20(–25) mm;

filaments 5.2–7.5(–12) mm, anthers (1.4–)3–4.5(–6) mm;

style (24–)35–45(–56) mm, stigma surrounded by anthers at anthesis.

cylindrical, sometimes slightly enlarged toward apex, 20–50 × 2–4 mm.

falcate (especially before maturity), ellipsoid-ovoid to ovoid, obtusely 4-angled, 12–38 × 6–14 mm, tapering to a sterile beak 2–8 mm, dehiscent to 1/2 their length, valve margins with a sinuate ridge or 8–20 nearly distinct tubercles;

pedicel 0–10 mm.

ellipsoid to subglobose, 0.9–1.8 × 0.4–0.9 mm.

usually numerous, sometimes as few as 5, in 2 adjacent rows per locule, obovoid, 2.5–3.1 × 1.1–1.4 mm, embryo 1/2 of seed volume, surface minutely papillose to reticulate;

seed collar without membrane, producing a large empty cavity, margin irregularly sinuate.

= 14.

= 14.