Flora of North America species comparison

(if present) usually unbranched, rarely with 1–several short laterals, 0–6(–21) cm.

(when present) usually ascending, sometimes erect or decumbent, branched or unbranched.

(2.8–)7–16(–21) × (0.3–)1–3(–5) cm;

petiole (1–)3–7(–10) cm;

blade obovate to linear-oblanceolate, margins coarsely and irregularly serrate or dentate, sometimes pinnately lobed or subentire.

in a basal rosette, sometimes also cauline, (0.5–)1.7–26(–36) cm;

blade margins usually coarsely dentate to pinnatifid, sometimes serrate or subentire.

solitary flowers from rosette or in axils of distal leaves.

floral tube (20–)40–60(–85) mm;

sepals (15–)24–35(–40) mm;

petals fading rose pink to dark rose purple, (16–)25–40(–48) mm;

filaments (12–)15–24(–26) mm, anthers 9–12 mm;

style (45–)60–120 mm.

opening near sunset with a sweet scent or nearly unscented;

buds erect or nodding by recurved floral tube, quadrangular, without free tips;

floral tube (2–)3–140(–165) mm;

sepals separating individually or in pairs;

petals white, fading rose purple to pink, obovate or obcordate;

pollen 90–100% fertile;

stigma deeply divided into 4 linear lobes.

falcate or sigmoid, becoming nearly straight at maturity, asymmetrical and often somewhat flattened, lanceoloid to ovoid, (10–)20–40(–50) × 4–6 mm, valve margins with prominent, sinuate ridge with 5–10 peaks, or nearly distinct tubercles;

pedicel 0.5–3 mm.

thick-walled and woody, straight to falcate or sigmoid, lanceoloid or ellipsoid-ovoid to cylindrical, or sometimes obtusely 4-angled, tapering to a sterile beak, valve margins with a row of tubercles or a thickened, undulate ridge, dehiscent 1/3–7/8 their length;

sessile or pedicellate.

narrowly obovoid, 2.5–3.9 × 1.2–1.7 mm embryo 1/2–2/3 of seed volume, surface papillose;

seed collar oblong, membrane depressed deeply into raphial cavity, margin usually sinuate only distally, sometimes sinuate throughout.

usually numerous, in (1 or) 2 rows per locule, obovoid to oblong, sometimes suborbicular or triangular, adaxial face with hollow chamber (seed collar) or, rarely (in O. brandegeei), filled with large, spongy cells, area above raphe a translucent membrane, surface papillose, reticulate, or irregularly roughened.

= 14.

= 14, 28.