Flora of North America species comparison

ascending to erect, unbranched or well-branched at base and distally, 15–100 cm.

(when present) ascending, 1–several, densely leafy, 0–20 cm.

in a basal rosette and cauline, basal 3–15 × 0.5–1 cm, blade lyrate;

cauline 1–9 × 0.1–0.8 cm, blade linear to very narrowly elliptic or narrowly lanceolate, margins sinuate-dentate to subentire.

in a basal rosette, sometimes also cauline, (2.5–)6–25(–32) × (0.6–)1.5–4(–5) cm, thin;

petiole (0.5–)1–8 cm;

blade oblanceolate to elliptic, margins irregularly pinnatifid, sometimes subentire, apex acute to obtuse or rounded.

4-merous, zygomorphic, opening at sunset;

floral tube 6–10 mm;

sepals 6–12 mm;

petals white, fading pink to red, narrowly obovate, 5.5–9.5 mm, short-clawed;

filaments 4–6 mm, anthers 2–3 mm, pollen 90–100% fertile;

style 11–19 mm, stigma surrounded by anthers at anthesis.

1–4 opening per day near sunset, without noticeable scent;

buds with subequal free tips 2–7 mm;

floral tube (20–)28–95(–138) mm;

sepals (6–)10–30(–35) mm;

petals pale yellow, fading pale orange, drying lavender, (10–)12–30(–38) mm;

filaments (5–)8–15(–18) mm, anthers (3.5–)4–11 mm;

style (3.4–)4.2–11.5(–16.3) mm, stigma usually surrounded by anthers, sometimes (especially in some Texas populations) exserted beyond anthers.

ellipsoid or narrowly obovoid, narrowly 4-winged, furrowed between wings, 6–8 × 2–3 mm, narrowed at base, stipe 0 mm;

sessile.

woody in age, rhombic-obovoid, winged, wings broadly triangular, 5–10 mm wide, often terminating in a hooked tooth, (10–)15–25(–28) × 4–8 mm (excluding wings), valve surface reticulate, dehiscent 1/8–1/3 their length.

4, yellowish to reddish brown, 2–3 × 1–1.5 mm.

asymmetrically cuneiform, (2.1–)2.5–3(–3.3) mm.

= 14.

= 14.