Flora of North America species comparison

usually 1 per caudex branch, arising from center of rosette near ground surface, (1–)2–6.3 dm, densely pubescent proximally, trichomes short-stalked, 3–8-rayed, 0.1–0.3(–0.5) mm, similarly pubescent 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 to linear-oblanceolate, 1.5–5 mm wide, margins usually dentate, not ciliate, surfaces densely pubescent, trichomes short-stalked, 5–12-rayed, 0.05–0.2 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.

7–45(–65), concealing stem proximally;

blade auricles absent or 0.7–3 mm, surfaces of distalmost leaves pubescent.

3–6, not concealing stem;

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

10–40(–64)-flowered, usually unbranched.

4–11-flowered, unbranched.

ascending to descending at anthesis;

sepals pubescent;

petals white to lavender, 5–9 × 0.8–1.8 mm, glabrous;

pollen ellipsoid.

erect to ascending at anthesis;

sepals glabrous;

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

pollen spheroid.

pendent, recurved distal to horizontal to ascending base, 4–10 mm, pubescent, trichomes appressed, branched.

erect to ascending, straight, 4–8 mm, usually glabrous, rarely sparsely pubescent, trichomes appressed, branched.

closely pendent, rarely appressed to rachis, sometimes somewhat secund, usually straight, edges parallel, 3–6.5 cm × 1.9–2.2 mm;

valves pubescent throughout;

ovules 38–64 per ovary;

style 0.05–0.1 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.

uniseriate, 1.4–1.8 × 1–1.4 mm;

wing continuous, 0.1–0.3 mm wide.

uniseriate, 2.5–3.5 × 1.8–2.5 mm;

wing continuous, 0.4–0.9 mm wide.

= 14.