Flora of North America species comparison

usually 1 per caudex branch, arising from center of rosette near ground surface, 1–4.5 dm, densely pubescent proximally, trichomes sessile, 2–4-rayed, 0.15–0.5 mm, glabrous distally.

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.

blade oblanceolate, 5–15 mm wide, margins denticulate, ciliate proximally, trichomes (simple), to 1 mm, surfaces moderately pubescent, trichomes subsessile, (2- or) 3–7-rayed, 0.1–0.3 mm.

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.

4–15, not concealing stem;

blade auricles 1–3.5 mm, surfaces of distalmost leaves glabrous.

10–30, often concealing stem proximally;

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

11–41-flowered, usually unbranched.

8–25-flowered, usually unbranched.

divaricate at anthesis;

sepals pubescent;

petals white, 6–7 × 1–2 mm, glabrous;

pollen spheroid.

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.

horizontal to slightly descending, curved to straight, 3–8(–14) mm, glabrous or with some subappressed, branched trichomes.

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

horizontal to slightly descending, not appressed to rachis, secund, straight, edges parallel, 3–6 cm × 1.5–2 mm;

valves glabrous;

ovules 56–94 per ovary.

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.

uniseriate, 1.2–1.5 × 1–1.3 mm;

wing continuous, 0.1–0.15 mm wide.

biseriate, 1.7–2.8 × 1.5–2.2 mm;

wing continuous, 0.25–0.65 mm wide.