Flora of North America species comparison

usually 1 per caudex branch, arising from center of rosette near ground surface, 0.6–2(–3) dm, glabrous throughout.

usually 2–5 per caudex branch, arising from margin of rosette near ground surface, or arising laterally proximal to sterile shoots, 1–3 dm, pubescent proximally, trichomes simple, to 1 mm, mixed with short-stalked, 2-rayed ones, 0.15–0.5 mm, glabrous or sparsely pubescent distally.

blade narrowly oblanceolate, 1–7 mm wide, margins entire, ciliate proximally, trichomes (simple mixed with a few short-stalked, 2-rayed ones) 0.1–0.4 mm, surfaces glabrous.

blade linear-oblanceolate to oblanceolate, 1–5(–9) mm wide, margins entire, ciliate, trichomes (simple), to 1 mm, surfaces densely pubescent, trichomes simple and 2–4-rayed, 0.15–0.5 mm.

2–4, not concealing stem;

blade auricles (0–)0.2–1 mm, surfaces of distalmost leaves usually glabrous, rarely ciliate proximally.

3–7, not concealing stem;

blade auricles 0.5–1.5 mm, surfaces of distalmost leaves sparsely pubescent or glabrous.

2–5-flowered, unbranched.

10–20-flowered, usually unbranched.

erect to ascending at anthesis;

sepals glabrous;

petals white to dark lavender, 4–8 × 1–2.5 mm, glabrous;

pollen ellipsoid.

divaricate-ascending at anthesis;

sepals pubescent;

petals white to pale lavender, 4–6 × 1.5–2 mm, glabrous;

pollen spheroid.

ascending, straight, 4–10 mm, glabrous.

horizontal, slightly to strongly recurved near apex, 3–13 mm, glabrous or, rarely, with simple trichomes.

suberect to ascending, usually not appressed to rachis, not secund, straight to curved, edges often somewhat undulate (not parallel), 2.5–6.5 cm × 3–7 mm;

valves glabrous;

ovules 10–20 per ovary;

style 0.05–0.3 mm.

pendent, not appressed to rachis, not secund, straight to slightly curved, edges parallel, 3–4.5 cm × 1.8–2 mm;

valves glabrous;

ovules 42–70 per ovary;

style 0.1–0.3 mm.

uniseriate, 3–6 × 2–4 mm;

wing continuous, 1.3–2.5 mm wide.

sub-biseriate, 1.2–1.5 × 0.8–1 mm;

wing absent or distal, 0.05–0.12 mm wide.