Flora of North America species comparison

erect, usually simple, 30–150 cm, with short, dense, eglandular pubescence, sparsely so toward base.

erect, simple or branched, slender, to 80 cm, subglabrous to retrorsely puberulent especially proximally, distal internodes frequently glutinous.

sessile, 2 per node;

blade prominently 3–5-veined, ovate-acuminate, round at base, (4–)6–10(–13) cm × (20–)30–50(–90) mm, appressed-pubescent on both surfaces.

2 per node;

blade with margins ciliate toward base, apex acute to obtuse;

basal blades oblanceolate, spatulate;

cauline narrowly oblanceolate to linear, 1–9 cm × 2–15 mm, scabrous or puberulent, rarely glabrous on both surfaces.

paniculate, narrow, many-flowered, open, bracteate, pedunculate, 10–50 × 3–5 cm, densely puberulent;

bracts narrowly lanceolate, 3–15 mm, apex acuminate;

peduncle ascending.

cymose, open, branches usually ascending, several- to many-flowered, 1-flowered in depauperate specimens.

ascending, recurved near apex, ca. equaling calyx.

nocturnal;

calyx prominently 10-veined, tubular to narrowly campanulate and 6–9 × 3–4 mm in flower, turbinate and 10–12 × 4–5 mm in fruit, narrowed proximally around carpophore, veins parallel, green, broad, with pale commissures, puberulent, sometimes with few glands, lobes triangular-acute, 2–3 mm;

corolla white, clawed, claw equaling calyx, broadened into limb, limb obtriangular, deeply lobed, 7–9 mm, lobes ca. 8, linear, appendages minute;

stamens slightly longer than corolla;

styles 3, ca. 2 times as long as corolla.

mature calyx prominently 10-veined, campanulate to ovate, 5–9 × 3–5 mm, margins dentate, glabrous, veins parallel, with pale commissures;

lobes usually purple, triangular, acute, ca. 1 mm;

petals white, often suffused with dark red, rarely wholly dark red, limb ovate, usually 2-lobed, ca. 2.5 mm, slightly longer than calyx, rarely petals absent, claw narrow, appendages 0.1–0.4 mm;

stamens included;

styles 3;

stigmas included.

narrowly ovoid, slightly longer than calyx, opening by 3 (splitting into 6) ascending teeth;

carpophore 2–2.5 mm.

equaling calyx, opening by 6 teeth;

carpophore less than 1 mm.

dark brown, reniform, 0.8–1.5 mm, shallowly tuberculate.

dull gray-black, reniform, 0.5–0.8 mm diam., finely papillate.

= 48.

= 24.