Flora of North America species comparison

unbranched, (0.05–)0.2–1(–1.7) dm, usually glabrous, rarely pubescent, trichomes usually simple, 0.3–0.8 mm, and 2–4 (or 5)-rayed, 0.1–0.6 mm, (rarely predominantly simple ones).

unbranched, (0.4–)0.6–1.5(–2.7) dm, pubescent throughout, trichomes simple, 0.5–1.5 mm, and 2–4-rayed ones, 0.05–0.3 mm, (sometimes 2–4-rayed ones distally).

rosulate;

sessile;

blade linear to oblong or oblanceolate-linear, 0.3–0.9(–1.4) cm × 0.5–1.5(–2) mm, margins entire, (ciliate, trichomes simple, 0.3–1.2 mm), surfaces glabrous or sparsely pubescent, abaxially with short-stalked, 2–4-rayed trichomes, 0.1–0.3 mm (midvein prominent), adaxially rarely with subapical, simple trichomes.

rosulate;

subsessile or shortly petiolate;

petiole ciliate throughout;

blade oblanceolate to spatulate or obovate, (0.6–)0.8–4.5(–6) cm × 2–12(–16) mm, margins usually entire, rarely obscurely dentate, (not ciliate), surfaces abaxially pubescent with stalked, (2–)4-rayed trichomes, 0.2–1 mm, adaxially with stalked, 2–4-rayed trichomes, 0.3–0.8 mm, and simple ones, 0.5–1.9 mm.

0.

0.

2–10(–22)-flowered, ebracteate, not or slightly elongated in fruit;

rachis not or slightly flexuous, glabrous or pubescent as stem.

(15–)30–75-flowered, ebracteate, elongated in fruit;

rachis not flexuous, pubescent, trichomes 2–4-rayed, sometimes with simple ones.

sepals ovate, 2–3 mm, usually sparsely pubescent, rarely glabrous, (trichomes simple and short-stalked, 2–4-rayed);

petals pale yellow (sometimes fading white), oblanceolate to obovate, 2–5 × 1–1.7(–2) mm;

anthers ovate or oblong, 0.4–0.6 mm.

sepals broadly ovate, 1.8–3.5 mm, pubescent, (trichomes simple and short-stalked, 2–4-rayed);

petals pale yellow, oblanceolate, 4–7 × 1.5–2.5 mm;

anthers ovate to oblong, 0.4–0.7 mm.

divaricate-ascending to ascending (not decurrent basally), straight, (0.7–)1.5–10(–25) mm, usually glabrous, rarely sparsely pubescent, trichomes predominantly simple (0.2–0.7 mm), sometimes 2–4 (or 5)-rayed, (0.1–0.5 mm).

horizontal to divaricate-ascending, straight, 3–11(–16) mm, pubescent, trichomes 2–4-rayed, sometimes with simple ones.

ovoid or ovate-lanceolate, plane (not curved), flattened, (2.5–)3–6(–8) × 2–3 mm;

valves pubescent or puberulent, trichomes simple and short-stalked, 2–5-rayed, 0.1–0.4 mm;

ovules 4–12 per ovary;

style 0.3–0.6(–1) mm.

ovoid-ellipsoid to oblong, plane, inflated basally, 3–8 × 1.8–3.5 mm;

valves hirsute, trichomes simple and spurred, (0.2–)0.3–1 mm, or puberulent, trichomes short-stalked, 2–4-rayed, 0.1–0.2 mm;

ovules 8–12(–18) per ovary;

style 0.6–2(–2.5) mm.

oblong to ovoid, 1.2–2(–2.6) × 0.9–1.2(–1.4) mm.

oblong, 0.9–1.2 × 0.6–0.8 mm.

= 36.

= 30.