Flora of North America species comparison

usually 1 per caudex branch, arising from center of rosette near ground surface, 2–8(–10) dm, usually glabrous proximally, rarely sparsely pubescent, trichomes simple, to 0.7 mm, glabrous distally.

usually 1 per caudex branch, arising from center of rosette near ground surface, 3–8 dm, densely pubescent proximally, trichomes simple mixed with fewer short-stalked, 2-rayed ones, 0.4–1.5 mm, glabrous or sparsely pubescent distally.

blade oblanceolate, 3–8(–13) mm wide, margins entire or denticulate, ciliate, trichomes (simple), 0.5–1.2 mm, surfaces sparsely to densely pubescent, trichomes simple, to 0.8 mm, often mixed with short-stalked, 2- or 3-rayed ones, 0.15–0.5 mm.

blade oblanceolate or linear-oblanceolate, 3–12 mm wide, margins usually entire, rarely dentate, ciliate proximally, trichomes (usually simple), to 1 mm, surfaces densely pubescent, trichomes short-stalked, 2–5-rayed, 0.3–0.8 mm.

6–30(–45), often concealing stem proximally;

blade auricles 1–1.5 mm, surfaces of distalmost leaves sparsely pubescent, sometimes margins ciliate.

(9–)15–35, often concealing stem proximally;

blade auricles 3–10 mm, surfaces of distalmost leaves glabrous, sometimes margins ciliate.

10–30(–50)-flowered, usually unbranched.

12–50-flowered, usually unbranched.

pendent at anthesis;

sepals pubescent;

petals white, 3–4 × 0.7–1.2 mm, glabrous;

pollen ellipsoid.

ascending at anthesis;

sepals sparsely pubescent;

petals usually lavender to purple, rarely white, 7–13 × 2–5 mm, glabrous;

pollen ellipsoid.

reflexed, abruptly recurved at base, otherwise straight, 4–10 mm, glabrous.

usually ascending, rarely almost horizontal, straight or slightly recurved, 3–10(–18) mm, usually pubescent, rarely glabrous, trichomes spreading, usually simple.

strongly reflexed, usually appressed to rachis, not secund, straight, edges parallel, 5–9 cm × 1.8–2.5 mm;

valves glabrous;

ovules 46–80 per ovary;

style 0.2–0.8 mm.

usually ascending, rarely almost horizontal, not appressed to rachis, not secund, usually curved, edges parallel, 5–13 cm × 1.7–2 mm;

valves glabrous;

ovules 90–170 per ovary;

style 0.05–0.3 mm.

uniseriate, 1.8–2.1 × 1–1.5 mm;

wing continuous, 0.15–0.25 mm wide.

uniseriate, 1.5–2 × 1–1.5 mm;

wing continuous, 0.1–0.2 mm wide.

= 14.