Flora of North America species comparison

erect to decumbent, much branched, 10–50(–90) cm.

ascending to erect, stout, unbranched or with lateral stems from basal rosette, densely leafy, 15–30 cm.

in a basal rosette and cauline, basal 4–8 × 0.7–1 cm, cauline 1–7 × 0.3–1.5 cm;

blade usually grayish green, narrowly oblong to narrowly elliptic or narrowly obovate, margins remotely shallowly dentate to subentire;

bracts spreading, flat.

10–14(–14.5) × 1.5–2.3(–3) cm;

petiole 4.3–6.6 cm;

blade narrowly oblanceolate, margins irregularly and coarsely dentate, apex acute.

usually 1 opening per day near sunset;

buds erect, with free tips erect and appressed or slightly spreading, 0.5–2 mm;

floral tube 15–35 mm;

sepals3–11 mm;

petals yellow, very broadly obovate or obcordate, 4.5–16 mm;

filaments 4–11 mm, anthers 2–5.5 mm, pollen ca. 50% fertile;

style 23–45 mm, stigma surrounded by anthers at anthesis.

usually 5–10 per stem opening per day near sunset, with heavy, sweet scent;

buds erect;

floral tube 31–60 mm;

sepals 17–26 mm;

petals white, fading pale pink, 20–26 mm;

filaments 11–16 mm, anthers 8–11 mm;

style 65–96 mm, stigma exserted beyond anthers at anthesis.

cylindrical, sometimes slightly enlarged toward apex, 15–45 × 2–3 mm.

straight, lanceoloid, obtusely 4-angled, (21–)25–30(–35) × (5–)6–8 mm, tapering to a sterile beak 6–8 mm, dehiscent 1/2–2/3 their length, valve margins with 5–8 conspicuous, irregular tubercles, sometimes 2 or more coalesced into a sinuate ridge, also with conspicuous medial ridge throughout;

pedicel 0.5–1 mm.

usually ellipsoid to broadly ellipsoid, rarely subglobose, 1–2 × 0.5–0.9 mm.

numerous, usually in 2 distinct rows per locule, sometimes rows partially overlapping, narrowly obovoid, 2.1–2.3 × 1–1.3 mm, embryo slightly less than 1/2 seed volume, surface appearing finely striate but papillose under magnification;

seed collar with membrane intact at maturity, membrane rarely splitting and separating from collar, margin entire.

= 14.

= 14.