Flora of North America species comparison

several, simple proximal to inflorescence, 30–80 cm, puberulent, becoming subglabrous near base.

several, erect, not much-branched, slender, 15–60 cm, flowering above middle.

withering proximally, in whorls of 4, ± sessile to short-petiolate, largest in mid-stem region;

blade lanceolate to ovate-lanceolate, 3–10 cm × 4–40 mm, apex acuminate, puberulent on both surfaces, sparsely so adaxially.

cauline in 2–4 pairs, gradually reduced distally, blade linear with broadened base, 1–8 cm × 1–2 mm, apex acute;

basal leaves tending to wither by flowering time, blade with midrib present, linear-oblanceolate, 5–12 cm × 1–4 mm, apex acute.

paniculate, open, bracteate, bracteolate, branches elongate, puberulent;

bracts and bracteoles linear-lanceolate, 2–15 mm.

few-flowered, bracteate, narrow, flowers terminal and axillary;

bracts linear, 2–10 mm.

straight, often with 1 or 2 pairs of bracteoles, slender, 1/2–3 times calyx, glabrous or scabrous-puberulous.

ascending, straight, slender, very short in bud but equaling or exceeding flower at anthesis.

calyx obscurely 10-veined, broadly campanulate, becoming obtriangular in fruit, 7–11 × 6–10 mm, herbaceous, margins dentate, very narrow, membranous, sparsely puberulent, lobes broadly triangular, 2–3 mm;

corolla white, ca. 2 times longer than calyx, limb obtriangular, narrowed into claw, divided ca. 1/2 its length into 4–12 lobes, appendages absent;

stamens equaling petals;

styles 3, longer than petals.

calyx 10-veined, campanulate, lobed to middle or below, 6–10 mm;

lobes 6, recurved, 1–3-veined, lanceolate to linear-lanceolate, margins membranous, ciliate, apex acute;

petals white to pale greenish, lobed, clawed, 12–20 mm including claw, ca. 2 times length of calyx;

lobes 4, small, 1.5–2 mm, claw woolly towards base, appendages absent;

stamens equaling petals;

filaments pubescent at base;

styles 3, shorter than to equaling stamens.

globose, opening by 3 broadly triangular teeth;

carpophore 2–3 mm.

ovoid, exceeding calyx, dehiscing with 6 spreading teeth;

carpophore 1–2 mm.

dark brown, reniform, ca. 1 mm, papillate.

brown, broadly reniform, less than 1.75 mm, margins coarsely tuberculate to papillate, with concentric rings of tubercles on both faces.

= (34), 48.

= 48.