Flora of North America species comparison

usually 1 per caudex branch, arising from center of leaf tufts, elevated above ground surface on woody base, (1.5–)3–7.5 dm, densely pubescent proximally, trichomes short-stalked, usually 4–7-rayed, 0.1–0.3 mm, similarly pubescent distally.

usually 1 per caudex branch, arising from center of rosette near ground surface, 1–2.5(–3.8) dm, densely pubescent proximally, trichomes simple, 0.5–1.5 mm, sparsely pubescent or glabrous distally.

blade linear to linear-oblanceolate, 1–3 mm wide, margins entire, not ciliate, surfaces densely pubescent, trichomes short-stalked, 4–9-rayed, 0.1–0.3 mm.

blade linear to narrowly oblanceolate, 0.5–2 mm wide, margins entire, ciliate, trichomes (simple), 1–1.7 mm, surfaces moderately pubescent, trichomes simple and long-stalked, 2-rayed, 0.5–1.7 mm.

10–30, often concealing stem proximally;

blade auricles absent or, rarely, to 0.5 mm, surfaces of distalmost leaves pubescent.

10–30, often concealing stem proximally;

blade auricles 0–0.5 mm, surfaces of distalmost leaves sparsely pubescent.

8–25-flowered, usually unbranched.

5–14-flowered, usually unbranched.

descending at anthesis;

sepals pubescent;

petals usually purple, rarely white, 9–16 × 2–4(–5) mm, sparsely pubescent or glabrous (trichomes scattered abaxially);

pollen ellipsoid.

ascending at anthesis;

sepals pubescent;

petals white to lavender, 6–10 × 2–3 mm, glabrous;

pollen ellipsoid.

reflexed, abruptly recurved at base, otherwise straight, 8–16 mm, pubescent, trichomes appressed, branched.

ascending, straight, 4–15(–20) mm, glabrous or sparsely pubescent, trichomes simple.

strongly reflexed, often appressed to rachis, sometimes somewhat secund, straight, edges parallel, 3.3–8 cm × 2.5–4 mm;

valves pubescent throughout;

ovules 68–106 per ovary;

style 0.1–0.3 mm.

ascending to divaricate-ascending, not appressed to rachis, not secund, straight or curved, edges parallel, 4–8(–9.5) cm × 2.3–3 mm;

valves glabrous;

ovules 56–106 per ovary;

style 0.1–0.5 mm.

biseriate, 1.7–2.8 × 1.5–2.2 mm;

wing continuous, 0.25–0.65 mm wide.

uniseriate, 1.5–2.5 × 1.5–2 mm;

wing continuous, 0.1–0.2 mm wide distally.