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.

1–9 per caudex branch, arising from center or margin of rosette near ground surface, (1.5–)2.5–5.5 dm, densely pubescent proximally, trichomes short-stalked, 2–4-rayed, 0.1–0.5 mm, mixed with some simple ones, to 0.8 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 oblanceolate, 2–9 mm wide, margins shallowly dentate or sometimes entire, ciliate proximally, trichomes (simple and spurred), to 1.2 mm, surfaces moderately to densely pubescent, trichomes short-stalked, 4–6(–8)-rayed, 0.1–0.5 mm.

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

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

4–9, not concealing stem;

blade auricles 1–3 mm, surfaces of distalmost leaves usually glabrous.

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

7–20-flowered, usually unbranched.

ascending at anthesis;

sepals pubescent;

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

pollen spheroid.

ascending at anthesis;

sepals pubescent;

petals lavender, 6–7 × 1.5–2 mm, glabrous;

pollen spheroid.

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

divaricate-ascending, gently curved downward, (7–)10–18 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.

usually widely pendent, rarely horizontal, not appressed to rachis, not secund, slightly curved, edges parallel, (3–)4.5–7 cm × 1.7–2 mm;

valves glabrous;

ovules 60–96 per ovary;

style 0.1–0.3 mm.

uniseriate, 1.8–2.2 × 1–1.4 mm;

wing continuous, 0.1–0.4 mm wide.

sub-biseriate, 1.2–1.8 × 0.9–1.2 mm;

wing continuous, 0.1–0.25 mm wide.