Flora of North America species comparison

unbranched, 0.08–0.6 dm, densely to moderately pubescent throughout, trichomes simple and stalked, 2- or 3-rayed, 0.2–1 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;

petiolate;

petiole ciliate, (trichomes simple, 0.2–1 mm);

blade linear to linear-oblanceolate, (0.4–)0.6–1.5(–2) cm × 1–2 mm, margins entire, (pubescent as petiole), surfaces pubescent abaxially with simple and stalked, 2- or 3-rayed trichomes, 0.1–0.4 mm, adaxially glabrate or subapically sparsely pubescent with simple trichomes.

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.

1–4;

sessile;

blade linear to linear-oblanceolate, margins entire, surfaces pubescent as basal.

usually 0, rarely 1–3;

sessile;

blade similar to basal.

5–12(–16)-flowered, usually ebracteate, rarely proximalmost flowers bracteate, slightly elongated in fruit;

rachis not flexuous, pubescent as stem.

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

rachis not flexuous, usually glabrous, rarely sparsely pubescent.

sepals ovate, 1.5–2 mm, pubescent, (trichomes simple and short-stalked, 2- or 3-rayed);

petals bright yellow, spatulate, 3–4.5 × 1–2 mm, (flared, clawed);

anthers ovate, 0.3–0.5 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 or slightly curved upward, 1.5–6 mm, pubescent as stem.

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

lanceolate to oblong-lanceolate, slightly twisted or plane, flattened, 4–12 × 1.5–3 mm;

valves glabrous or pubescent, trichomes simple, 0.07–0.2 mm;

ovules 16–20 per ovary;

style 0.4–1.2 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, 1–1.4 × 0.7–1 mm.

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

= 24 ± 3.

= 16, 30, 32.