Flora of North America species comparison

usually 1 per caudex branch, arising from center of rosette near ground surface, (1.5–)2.5–8 dm, densely pubescent proximally, trichomes simple and short-stalked, 2-rayed, to 1 mm, sparsely pubescent or glabrous distally.

usually 1 per plant, arising from center of rosette near ground surface, (2–)3–7 dm, glabrous throughout, often glaucous.

blade oblanceolate, 1–7 mm wide, margins entire or dentate, ciliate along petiole, trichomes (simple), to 0.7 mm, surfaces moderately to densely pubescent, trichomes short-stalked, 5–8-rayed, 0.15–0.4 mm.

blade oblanceolate to obovate, 4–10 mm wide, margins dentate, not ciliate, surfaces glabrous or sparsely pubescent subapically, trichomes simple, 0.3–0.8 mm.

(8–)15–40, concealing stem proximally;

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

18–28, often concealing stem proximally;

blade auricles absent, surfaces of distalmost leaves glabrous.

(15–)30–90-flowered, usually unbranched.

20–50-flowered, usually unbranched.

descending to pendent at anthesis;

sepals pubescent;

petals usually white, rarely lavender, 4–6 × 0.8–1.5 mm, glabrous;

pollen ellipsoid.

ascending at anthesis;

sepals glabrous;

petals white, 3–5 × 0.5–0.7 mm, glabrous;

pollen ellipsoid.

reflexed, abruptly recurved at base, otherwise straight, 4–13 mm, glabrous or sparsely pubescent, trichomes usually simple.

ascending to divaricate-ascending, usually straight, 4–12 mm, glabrous.

strongly reflexed, usually appressed to rachis, rarely somewhat secund, straight, edges parallel, 3.5–6 cm × 0.9–1.5 mm;

valves glabrous;

ovules 70–126 per ovary;

style 0.2–0.5 mm.

divaricate-ascending, not appressed to rachis, not secund, usually curved, rarely straight, edges parallel, 5–10 cm × 1.5–1.8 mm;

valves glabrous;

ovules 64–80 per ovary;

style 0.2–0.6 mm.

uniseriate, 1–1.4 × 0.8–1 mm;

wing continuous (rarely absent), to 0.1 mm wide.

uniseriate, 1.5–1.8 × 1.2–1.4 mm;

wing continuous, 0.3–0.5 mm wide distally.

= 14.