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, slightly elevated on woody base or from near ground surface, 2–6 dm, pubescent proximally, trichomes usually subsessile, 2- or 3-rayed, rarely simple, 0.25–0.4 mm, glabrous 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, 2–6 mm wide, margins entire, ciliate proximally, trichomes to 0.7 mm, surfaces sparsely pubescent, trichomes subsessile to short-stalked, 2–5-rayed, 0.1–0.4 mm.

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

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

5–10, rarely concealing stem proximally;

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

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

5–16-flowered, usually unbranched.

pendent at anthesis;

sepals pubescent;

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

pollen ellipsoid.

ascending at anthesis;

sepals glabrous;

petals purple, 6–8 × 1.5–2 mm, glabrous;

pollen spheroid.

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

divaricate-ascending, straight, 4–10 mm, glabrous.

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.

divaricate-ascending, not appressed to rachis, not secund, straight, edges somewhat undulate (not parallel), 4–6.5(–7.6) cm × 2.5–3.5 mm;

valves glabrous;

ovules 24–54 per ovary;

style 0.2–0.8 mm.

uniseriate, 1.8–2.1 × 1–1.5 mm;

wing continuous, 0.15–0.25 mm wide.

uniseriate, 2.5–3.2 × 1.8–2.5 mm;

wing distal, 0.3–1 mm wide.