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 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.

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 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.

2–4, not concealing stem;

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

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

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

2–5-flowered, unbranched.

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

erect to ascending at anthesis;

sepals glabrous;

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

pollen ellipsoid.

pendent at anthesis;

sepals pubescent;

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

pollen ellipsoid.

ascending, straight, 4–10 mm, glabrous.

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

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.

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.

uniseriate, 3–6 × 2–4 mm;

wing continuous, 1.3–2.5 mm wide.

uniseriate, 1.8–2.1 × 1–1.5 mm;

wing continuous, 0.15–0.25 mm wide.