Flora of North America species comparison

usually 3–7 per caudex branch, arising from margin of rosette near ground surface, or arising laterally proximal to sterile shoots, 0.4–2.5 dm, glabrous or pubescent proximally, trichomes simple and short-stalked, 2-rayed, 0.1–0.4 mm, glabrous distally.

usually 1 per caudex branch, arising from center of rosette, elevated above ground surface on woody base, 1.5–2.5 dm, glabrous throughout.

blade linear to linear-oblanceolate, 1–2.5 mm wide, margins usually entire, rarely denticulate, often ciliate, trichomes (simple), 0.3–0.7 mm, surfaces glabrous or sparsely pubescent, trichomes short-stalked, 2- or 3-rayed, 0.1–0.4 mm.

blade oblanceolate, 3–8 mm wide, margins entire, ciliate proximally, trichomes (simple), 0.2–0.7 mm, surfaces glabrous or sparsely pubescent, trichomes short-stalked, 2–4-rayed, 0.2–0.4 mm.

3–12, not concealing stem;

blade auricles absent, surfaces of distalmost leaves usually glabrous, rarely sparsely pubescent.

6–12, sometimes concealing stem proximally;

blade auricles 0.5–2.5 mm, surfaces of distalmost leaves glabrous.

2–12-flowered, unbranched.

3–7-flowered, unbranched.

ascending-divaricate at anthesis;

sepals glabrous or pubescent;

petals white to pale lavender, 4–5 × 1.5–2 mm, glabrous;

pollen ellipsoid.

divaricate-ascending at anthesis;

sepals glabrous;

petals creamy white, 8–11 × 2–2.5 mm, glabrous;

pollen ellipsoid.

divaricate-ascending to horizontal, slightly to strongly recurved, 3–8 mm, glabrous or sparsely pubescent, trichomes (isolated), simple.

strongly curved proximally, 4–6 mm, glabrous.

pendent, not appressed to rachis, not or, rarely, weakly secund, straight, edges parallel, 1.5–3.5 cm × 1.2–2 mm;

valves glabrous;

ovules 28–44 per ovary;

style 0.1–0.4 mm.

pendent, not appressed to rachis, not secund, straight to slightly curved, edges undulate (not parallel), 3.5–6 cm × 2.5–3.5 mm;

valves glabrous;

ovules 14–22 per ovary;

style 0.5–1 mm.

uniseriate, 0.9–1.2 × 0.6–1 mm;

wing often continuous, 0.07–0.1 mm wide.

uniseriate, 3–4 × 1.5–2 mm;

wing distal and proximal, 0.3–0.6 mm wide.