Flora of North America species comparison

1 per plant, arising from center of rosette near ground surface, 2.5–10(–12.5) dm, sparsely to densely pubescent proximally, trichomes simple, to 1 mm, glabrous or sparsely pubescent 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 obovate to oblanceolate, 10–30 mm wide, margins dentate, ciliate proximally, trichomes simple, to 1 mm, surfaces moderately pubescent, trichomes simple, 0.5–1.5 mm, these mixed with smaller, 2- or 3-rayed ones.

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.

12–20, often concealing stem proximally;

blade auricles absent or proximalmost blades with auricles 0.5–2(–5) mm, surfaces of distalmost leaves sparsely pubescent.

5–10, rarely concealing stem proximally;

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

15–65(–82)-flowered, sometimes branched.

5–16-flowered, usually unbranched.

divaricate-ascending to horizontal at anthesis;

sepals pubescent;

petals white, 3–5 × 0.7–1.2 mm, glabrous;

pollen ellipsoid.

ascending at anthesis;

sepals glabrous;

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

pollen spheroid.

descending to horizontal, usually curved, rarely straight, 6–13(–17) mm, pubescent or glabrous, trichomes subappressed, usually 2-rayed.

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

pendent to horizontal, not appressed to rachis, often secund, curved, edges parallel, 4–10 cm × 2.5–4 mm;

valves glabrous;

ovules 40–62 per ovary;

style 0.3–0.8(–1.1) 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, 1.7–3.5 × 1.5–2.2 mm;

wing continuous, 0.4–1 mm wide distally.

uniseriate, 2.5–3.2 × 1.8–2.5 mm;

wing distal, 0.3–1 mm wide.

= 14.