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 tuft, above ground surface on woody base, 2–5.5 dm, densely pubescent proximally, trichomes short-stalked, 4–7-rayed, 0.1–0.4 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, 2–3(–4) mm wide, margins entire, sometimes ciliate near petiole base, trichomes (simple or 2-rayed), to 0.8 mm, surfaces densely pubescent, trichomes short-stalked, 4–8-rayed, 0.1–0.3 mm.

4–15, not concealing stem;

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

7–18, concealing stem proximally;

blade auricles absent, surfaces of distalmost leaves densely pubescent.

11–41-flowered, usually unbranched.

6–26-flowered, usually unbranched.

divaricate at anthesis;

sepals pubescent;

petals white, 6–7 × 1–2 mm, glabrous;

pollen spheroid.

divaricate at anthesis;

sepals pubescent;

petals white to pale lavender, 8–18 × 2.5–4.4(–5.5) mm, glabrous;

pollen ellipsoid.

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

horizontal to descending, usually recurved, 5–10(–20) 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.

divaricate-descending to reflexed, usually not appressed to rachis, rarely somewhat secund, straight, edges parallel, 4.3–7 cm × 1.6–3 mm;

valves pubescent throughout;

ovules 72–98 per ovary;

style ca. 0.1 mm.

uniseriate, 1.2–1.5 × 1–1.3 mm;

wing continuous, 0.1–0.15 mm wide.

biseriate, 1.2–1.6 × 1–1.2 mm;

wing continuous, 0.1–0.2 mm wide.

= 14.