Flora of North America species comparison

usually 2–7 per caudex branch, arising from margin of rosette near ground surface, 0.5–2(–3) dm, densely pubescent proximally, trichomes simple and stalked, 2-rayed, 0.3–0.8 mm, glabrous distally.

usually 2–6 per caudex branch, arising from margin of rosette near ground surface, 0.8–4 dm, densely pubescent proximally, trichomes simple and short-stalked, 2-rayed, 0.3–0.6 mm, glabrous distally.

blade narrowly oblanceolate, 1–3 mm wide, margins entire, ciliate, trichomes to 1 mm, surfaces pubescent, trichomes stalked, 2–4-rayed, 0.3–0.8 mm.

blade narrowly oblanceolate, 1–5 mm wide, margins entire or few-toothed, ciliate proximally, trichomes (simple), to 0.9 mm, surfaces densely pubescent, trichomes simple and short-stalked, 2- or 3-rayed, 0.3–0.5 mm.

3–7(–10), not concealing stem;

blade auricles 0.2–1 mm, surfaces of distalmost leaves glabrous.

3–6, not concealing stem;

blade auricles 0.3–0.6 mm, surfaces of distalmost leaves glabrous.

6–15-flowered, unbranched.

7–15-flowered, usually unbranched.

ascending at anthesis;

sepals pubescent;

petals white or lavender, 5–7 × 1.5–2.5 mm, glabrous;

pollen spheroid.

ascending at anthesis;

sepals pubescent;

petals lavender, 3.5–6 × 1–1.5 mm, glabrous;

pollen ellipsoid.

horizontal to divaricate-ascending, straight, 3–9 mm, glabrous.

divaricate-ascending to horizontal, straight or gently recurved, 4–10 mm, glabrous or sparsely pubescent, trichomes spreading.

horizontal to divaricate-ascending, not appressed to rachis, not secund, usually strongly curved, edges parallel, 3.5–6.5 cm × 1.7–2 mm;

valves glabrous;

ovules 50–84 per ovary;

style 0.05–0.5 mm.

divaricate-ascending to horizontal, not appressed to rachis, not secund, usually curved or straight, edges parallel, 2.5–4 cm × 1.2–1.5 mm;

valves glabrous;

ovules 50–80 per ovary;

style 0.05–0.3 mm.

uniseriate, 1.5–2 × 1.1–1.5 mm;

wing continuous, 0.1–0.2 mm wide.

uniseriate, 1–1.5 × 0.7–1 mm;

wing usually distal, ca. 0.1 mm wide.