Flora of North America species comparison

usually 1 per caudex branch, arising from center of rosette near ground surface, 2–7 dm, sparsely to densely pubescent proximally, trichomes subsessile, sub-malpighiaceous, 0.3–0.6 mm, glabrous distally.

usually 1 per caudex branch, arising from center of rosette, near ground surface or slightly elevated on woody base, 1–3.8 dm, densely pubescent proximally, trichomes short-stalked, 4–8-rayed, 0.04–0.1 mm, sometimes mixed with stalked, 2-rayed ones, to 0.5 mm, usually sparsely pubescent distally.

blade oblanceolate, 3–7 mm wide, margins entire, ciliate proximally, trichomes (simple), to 0.8 mm, surfaces sparsely to densely pubescent, trichomes subsessile, 2–5-rayed, 0.2–0.55 mm.

blade narrowly oblanceolate, 1–4 mm wide, margins entire, ciliate along petiole, trichomes (simple), to 1 mm, surfaces densely pubescent, trichomes short-stalked, 4–8-rayed, 0.04–0.1 mm.

7–17, often concealing stem proximally;

blade auricles 2–5 mm, surfaces of distalmost leaves sparsely pubescent or glabrous.

5–10, not concealing stem;

blade auricles 0.3–2 mm, surfaces of distalmost leaves usually sparsely pubescent.

19–39-flowered, usually unbranched.

10–20-flowered, usually unbranched.

divaricate to pendent at anthesis;

sepals pubescent;

petals white to pale lavender, 6–7 × 1.2–2 mm, glabrous;

pollen spheroid.

ascending at anthesis;

sepals (purplish or greenish) glabrous or sparsely or moderately pubescent;

petals white or purple to lavender, 7–12 × 1.5–4 mm, glabrous;

pollen ellipsoid.

reflexed, recurved proximally, 5–13 mm, glabrous.

divaricate-ascending, straight, 5–20 mm, sparsely pubescent, trichomes appressed, branched.

reflexed, rarely appressed to rachis, not secund, straight, edges parallel, 4–7(–8.5) cm × 2–2.3 mm;

valves glabrous;

ovules 88–104 per ovary;

style 0.3–0.7 mm.

divaricate-ascending, not appressed to rachis, not secund, straight or curved, edges parallel, 3.5–6.5(–7.5) cm × 1–1.6 mm;

valves glabrous;

ovules 30–72 per ovary;

style 0.1–1 mm.

sub-biseriate, 2–2.5 × 1.1–1.5 mm;

wing continuous, 0.15–0.25 mm wide.

uniseriate, 1–1.2 × 0.8–1 mm;

wing continuous, ca. 0.1 mm wide.