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.

1–5 per caudex branch, arising from center or margin of rosette near ground surface, 1–3 dm, sparsely pubescent proximally, trichomes subsessile, 2–5-rayed, 0.1–0.4 mm, glabrous or 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, 2–6 mm wide, margins entire, ciliate at petiole base, trichomes (simple), to 0.4 mm, surfaces moderately pubescent, trichomes sessile or subsessile, 2–5-rayed, 0.1–0.4 mm.

7–17, often concealing stem proximally;

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

3–6, not concealing stem;

blade auricles absent or 0.2–0.5 mm, surfaces of distalmost leaves glabrous, or sparsely pubescent along margins.

19–39-flowered, usually unbranched.

4–11-flowered, unbranched.

divaricate to pendent at anthesis;

sepals pubescent;

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

pollen spheroid.

erect to ascending at anthesis;

sepals glabrous;

petals usually lavender, rarely whitish, 4–7 × 1.2–2 mm, glabrous;

pollen spheroid.

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

erect to ascending, straight, 4–8 mm, usually glabrous, rarely 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.

erect to ascending, often appressed to rachis, not secund, straight, edges often slightly undulate (not parallel), 3–7 cm × 2–3 mm;

valves glabrous;

ovules 26–42 per ovary;

style 0.05–0.3 mm.

sub-biseriate, 2–2.5 × 1.1–1.5 mm;

wing continuous, 0.15–0.25 mm wide.

uniseriate, 2.5–3.5 × 1.8–2.5 mm;

wing continuous, 0.4–0.9 mm wide.