Flora of North America species comparison

erect, branched or unbranched, 30–300 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 3–7 × 0.5–2 cm, sessile, blade oblong to oblong-lanceolate, base usually ± auriculate, margins entire;

cauline 3–8(–10) × 0.4–1.8 cm, blade lanceolate to oblong-lanceolate, gradually smaller, becoming linear-subulate distally.

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.

long, wandlike, unbranched or branched.

4-merous, nearly actinomorphic, opening near sunrise;

floral tube 6–17 mm;

sepals 4–6 mm;

petals white, fading off-white or tinged pink, slightly unequal, rhombic, 4–6 mm, abruptly clawed;

filaments 5–8 mm, anthers 1.5–2 mm, pollen 85–100% fertile;

style 6–10, stigma exserted beyond 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.

ovoid, 4-angled, somewhat flattened, 3–4 × 1.5–2.3 mm, valves with raised midrib and conspicuous lateral veins;

sessile.

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.

1, pale yellow, oblanceoloid, 2.4–2.6 × 1–1.5 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.