Flora of North America species comparison

unbranched, (0.05–)0.1–0.4 dm, usually pubescent throughout, rarely sparsely pubescent or glabrous distally, trichomes simple and 2-rayed, (often crisped), 0.1–0.6 mm.

(simple or few from, or distal to, base), unbranched, (0.1–)0.3–1.2(–1.6) dm, sparsely to densely pubescent proximally, trichomes 2 (or 3)-rayed, 0.1–0.6 mm, sometimes with simple or spurred ones, to 0.9 mm, distally usually glabrous, rarely with few trichomes.

rosulate;

subsessile or shortly petiolate;

petiole margin ciliate or not;

blade narrowly oblanceolate, (0.3–)0.5–1.6(–2) cm × (1–)1.5–3(–4) mm, margins usually entire, rarely subapically denticulate, (ciliate or not), surfaces pubescent with simple and stalked, 2-rayed trichomes, 0.1–0.7 mm, (midvein obscure abaxially).

not rosulate;

petiole obscure;

blade elliptic or spatulate to obovate or suborbicular, 0.5–2.3(–3) cm × 1.5–8(–13) mm, margins entire, surfaces pubescent abaxially with stalked, 2–4-rayed trichomes, 0.1–0.5 mm, adaxially with simple trichomes, 0.6–1 mm, with stalked, 2-rayed ones, to 0.7 mm.

0–2 (or 3);

sessile;

blade ovate to oblong, margins entire, surfaces pubescent as basal.

usually 0, rarely 1–3;

sessile;

blade similar to basal.

(3–)6–13(–17)-flowered, ebracteate or proximalmost 1 (or 2) flowers bracteate, not or slightly elongated in fruit;

rachis not flexuous, usually pubescent as stem, rarely glabrous.

(3–)5–12(–16)-flowered, ebracteate, (subumbellate), not elongated in fruit;

rachis not flexuous, usually glabrous, rarely sparsely pubescent.

sepals (persistent), oblong, 1–1.5 mm, subapically sparsely pubescent, (trichomes simple);

petals white, spatulate, 1.5–2 × 0.5–0.6 mm;

anthers ovate, 0.15–0.2 mm.

(late-season ones cleistogamous, apetalous);

sepals oblong, 1.5–2.3 mm, pubescent, (trichomes simple);

petals (rarely absent), white, spatulate, 2–4.5 × 1–1.5 mm;

anthers ovate, 0.4–0.5 mm.

divaricate-ascending, straight, 1–2.5(–4) mm, usually pubescent as stem, rarely glabrous.

horizontal to divaricate-ascending, straight, (1–)2–7(–9) mm, glabrous or glabrate.

ovoid to subellipsoid, plane, slightly inflated basally, (2–)3–5 × (1.2–)1.5–2.5 mm;

valves usually puberulent, rarely glabrous, trichomes simple, 0.05–0.2 mm;

ovules 12–20 per ovary;

style 0.1–0.2 mm.

linear to linear-oblong, plane, flattened, (5–)7–16(–20) × 1.2–2.3 mm;

valves glabrous or pubescent, trichomes usually simple and antrorse, 0.1–0.3 mm, rarely with fewer, spurred or 2-rayed ones;

ovules 32–88 per ovary;

style 0.02–0.1 mm.

ovoid, 0.6–0.8 × 0.4–0.6 mm.

oblong to ovoid, 0.5–0.8 × 0.3–0.5 mm.

= 16, 30, 32.