Flora of North America species comparison

usually 1 per caudex branch, arising from center of rosette near ground surface, 2.5–9 dm, densely pubescent proximally, trichomes short-stalked, 2–6-rayed, 0.1–0.7 mm, similarly pubescent distally.

usually 1 per caudex branch, arising from center of rosette, elevated above ground surface on woody base, 1–4(–5) dm, usually glabrous proximally, rarely pubescent, trichomes short-stalked, 2-rayed, 0.1–0.3 mm, glabrous distally.

blade oblanceolate, 1.5–7 mm wide, margins entire or shallowly dentate, ciliate at petiole base, trichomes to 0.9 mm, surfaces densely pubescent, trichomes short-stalked, 5–10-rayed, 0.1–0.25 mm.

blade narrowly oblanceolate, 1.5–6 mm wide, margins entire, not ciliate or, rarely, with simple trichomes to 0.7 mm, surfaces glabrous or sparsely to densely pubescent, trichomes short-stalked, 2–6-rayed, 0.07–0.4 mm.

16–42, concealing stem proximally;

blade auricles 0.5–1.5 mm, surfaces of distalmost leaves pubescent.

(4–)6–12, sometimes concealing stem proximally;

blade auricles 0.5–2 mm, surfaces of distalmost leaves glabrous.

17–96-flowered, usually unbranched.

6–12-flowered, usually unbranched.

descending at anthesis;

sepals pubescent;

petals white, 6–9 × 1–2.5 mm, sparsely pubescent abaxially;

pollen ellipsoid.

pendent at anthesis;

sepals glabrous;

petals purple or whitish with rose tips, 4.5–6 × 2–2.5 mm, glabrous;

pollen ellipsoid or spheroid.

reflexed, abruptly recurved at base, otherwise straight, 7–13 mm, pubescent, trichomes appressed, branched.

reflexed, usually abruptly recurved at base, otherwise straight, 4–18 mm, glabrous.

strongly reflexed, usually appressed to rachis, sometimes somewhat secund, straight, edges parallel, 3.5–7.2 cm × 1.2–1.5 mm;

valves densely pubescent;

ovules 74–110 per ovary;

styles 0.05–0.2 mm.

reflexed to closely pendent, sometimes appressed to rachis, often secund, straight to somewhat curved, edges undulate (not parallel), 3–7(–8) cm × 3–5(–6) mm;

valves glabrous;

ovules 20–30 per ovary;

style 0.4–1.2 mm.

uniseriate, 0.9–1.2 × 0.7–1 mm;

wing continuous, 0.05–0.1 mm wide.

uniseriate, 2.5–5.5 × 1.8–3.5 mm;

wing continuous, 0.8–1.5 mm wide.