Flora of North America species comparison

usually branched, 1.1–3.4 dm, hirsute proximally, trichomes mostly simple and 2-rayed, 0.2–1.5 mm, pubescent distally, trichomes mostly 2- or 3-rayed, 0.2–1 mm.

unbranched, 0.5–1.5 dm, pubescent throughout, trichomes malpighiaceous, 0.2–0.5 mm, and sometimes simple.

rosulate;

petiole (obscure), ciliate, (trichomes simple and 2-rayed);

blade obovate to oblanceolate, 1.6–2.5 cm × 5–10 mm, margins usually entire, rarely denticulate, surfaces pubescent, abaxially with stalked, mostly cruciform trichomes, 0.5–1 mm, adaxially with simple and stalked, 2–4-rayed ones.

rosulate;

petiolate;

petiole not ciliate;

blade oblanceolate to spatulate, 0.5–1.8 cm × 2–4 mm, margins entire or dentate, (not ciliate proximally), surfaces pubescent with malpighiaceous trichomes, 0.3–0.6 mm.

usually 1–5;

sessile or subsessile;

blade oblanceolate to oblong, margins often denticulate, (ciliate proximally, with 2- or 3-rayed trichomes).

4–13;

sessile;

blade broadly ovate to lanceolate, margins denticulate, surfaces pubescent as basal.

9–25-flowered, ebracteate, elongated in fruit;

rachis not flexuous, pubescent, trichomes 2- or 3-rayed.

10–33-flowered, ebracteate, elongated in fruit;

rachis not flexuous, glabrous or pubescent, trichomes simple and/or malpighiaceous.

sepals oblong-obovate, 2–3.5 mm, pubescent, (trichomes short- to long-stalked, 2–4-rayed, 0.2–0.8 mm);

petals yellow (often fading whitish), oblanceolate, 3–5 × 1–1.5 mm;

anthers ovate, 0.4–0.5 mm.

sepals ovate, 2.5–3 mm, subapically pubescent, (trichomes simple and malpighiaceous);

petals yellow, oblanceolate, 4–5 × 1.5–2 mm;

anthers oblong, 0.7–1 mm.

horizontal to divaricate-ascending, usually straight, rarely curved upward, 7–10 mm, pubescent, trichomes 2- or 3-rayed.

divaricate-ascending, straight or curved upward, 6–13 mm, pubescent abaxially, trichomes simple and/or malpighiaceous.

narrowly elliptic to slightly falcate, plane, flattened, (7–)10–16 × (2–)2.5–3.7 mm;

valves pubescent, trichomes short-stalked, 2–4-rayed, 0.2–0.5 mm;

ovules 14–22 per ovary;

style 0.9–1.2 mm.

elliptic to elliptic-lanceolate, plane, flattened, 5–10 × 1.5–2.2 mm;

valves glabrous;

ovules 14–18 per ovary;

style 0.8–1.2 mm.

oblong, 1.1–1.5 × 0.7–0.9 mm.

ovoid, 1–1.4 × 0.7–0.9 mm.

= 20.