Flora of North America species comparison

usually 1 per caudex branch, arising from center of rosette near ground surface, 1.5–6 dm, densely pubescent proximally, trichomes sessile, 2–4-rayed, 0.15–0.4 mm, usually sparsely pubescent distally, rarely glabrous.

usually 2–6 per caudex branch, arising from margin of rosette near ground surface, 0.5–2 dm, glabrous or sparsely pubescent proximally, trichomes simple and short-stalked, 2-rayed, to 0.2 mm, glabrous distally.

blade oblanceolate, 1.5–6 mm wide, margins usually entire, rarely denticulate, ciliate proximally, trichomes (simple), to 0.5 mm, surfaces sparsely to moderately pubescent, trichomes sessile, 3–5 (or 6)-rayed, 0.15–0.35 mm.

blade linear-oblanceolate, 1–2.5 mm wide, margins entire, ciliate along petiole, trichomes (simple), 0.4–0.7 mm, surfaces usually sparsely pubescent, rarely glabrous, trichomes short-stalked, 2- or 3-rayed, 0.1–0.4 mm.

2–20(–38), often concealing stem proximally;

blade auricles 0.3–2 mm, surfaces of distalmost leaves sparsely pubescent or glabrous.

3–5, not concealing stem;

blade auricles 0–0.2 mm, surfaces of distalmost leaves usually glabrous or, rarely, margins sparsely ciliate.

5–20(–36)-flowered, usually unbranched.

6–13-flowered, unbranched.

ascending at anthesis;

sepals pubescent;

petals white or lavender, 5–7 × 0.9–1.3 mm, glabrous;

pollen spheroid.

divaricate-ascending at anthesis;

sepals glabrous or sparsely pubescent, trichomes spreading, 2-rayed;

petals white to lavender, 4–5 × 1.5–1.8 mm, glabrous;

pollen spheroid.

erect to ascending, usually straight, 3–10 mm, pubescent or glabrous, trichomes appressed, branched.

horizontal to divaricate-descending, straight or slightly curved downward, 2–5 mm, glabrous.

ascending, not appressed to rachis, not secund, straight, edges parallel, 2.5–7.5 cm × 1.2–1.8 mm;

valves glabrous;

ovules 46–100 per ovary;

style 0.3–1 mm.

horizontal or divaricate-descending, not appressed to rachis, secund, straight, edges parallel, 1.6–3.2 cm × 1.5–2 mm;

valves glabrous;

ovules 20–32 per ovary;

style 0.1–0.4 mm.

uniseriate, 1.8–2.2 × 1–1.4 mm;

wing continuous, 0.1–0.4 mm wide.

uniseriate, 1.2–1.5 × 0.8–0.9 mm;

not winged or with distal wing 0.05–0.1 mm wide.