Flora of North America species comparison

usually 1 per caudex branch, arising from center of rosette near ground surface, 0.3–1.5 dm, densely pubescent proximally, trichomes simple and short-stalked, 2–4-rayed, (0.07–)0.1–0.2 mm, glabrous or sparsely pubescent distally.

usually 1 per caudex branch, arising from center of rosette, often elevated above ground surface on woody base, 5–7 dm, glabrous or sparsely pubescent proximally, trichomes short-stalked, 2- or 3-rayed, 0.15–0.4 mm, glabrous or sparsely pubescent distally.

blade linear-oblanceolate, 1–3(–5) mm wide, margins entire, ciliate proximally, trichomes to 0.4 mm, surfaces densely pubescent, trichomes short-stalked, 2–6-rayed, (0.07–)0.1–0.2 mm.

blade narrowly oblanceolate, 3–8 mm wide, margins coarsely dentate, ciliate, trichomes (simple and 2-rayed), to 0.6 mm, surfaces sparsely to densely pubescent, trichomes short-stalked, 2–7-rayed, 0.15–0.4 mm.

2–6, rarely concealing stem;

blade auricles 0 (or 0.2–1.5) mm, surfaces of distalmost leaves glabrous.

15–65, concealing stem;

blade auricles 1–4 mm, surfaces of distalmost leaves pubescent.

3–8-flowered, unbranched.

30–70-flowered, sometimes branched.

erect at anthesis;

sepals glabrous or sparsely pubescent;

petals lavender to purplish, 4–6(–7) × 1–2 mm, glabrous;

pollen ellipsoid.

ascending at anthesis;

sepals pubescent;

petals white or pale lavender, 8–10 × 1.5–2 mm, glabrous;

pollen ellipsoid.

erect, straight, 3–9 mm, glabrous or sparsely pubescent.

divaricate-ascending, straight, 10–45 mm, glabrous.

erect, appressed to rachis, not secund, straight, edges parallel, 2.5–5.5 cm × 1.3–1.7(–2) mm;

valves glabrous;

ovules 24–40 per ovary;

style 0.2–1 mm.

divaricate-ascending to horizontal, not appressed to rachis, not secund, usually curved, rarely straight, edges parallel, 6–10 cm × 2.5–3 mm;

valves glabrous;

ovules 170–220 per ovary;

style 0.05–0.5 mm.

usually uniseriate, rarely sub-biseriate, 1.5–2(–2.5) × 1–1.4 mm;

wing continuous, 0.3–1 mm wide.

biseriate, 1.2–1.6 × 0.9–1.2 mm;

wing continuous, 0.1–0.2 mm wide.