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 near ground surface, 0.3–1.5(–2) 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 linear-oblanceolate, 1–5(–8) mm wide, margins entire, usually ciliate at least proximally, trichomes (simple and/or short-stalked, 2- or 3-rayed), 0.1–0.3 mm, surfaces (sometimes the entire leaf) usually glabrous or (rarely, the youngest leaves of sterile shoots) pubescent, trichomes 4–6-rayed, 0.05–0.1 mm.

3–12, not concealing stem;

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

1–5, usually not concealing stem;

blade auricles 0.5–1.5 mm or, rarely, absent, surfaces glabrous.

2–12-flowered, unbranched.

2–10(–15)-flowered, unbranched.

ascending-divaricate at anthesis;

sepals glabrous or pubescent;

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

pollen ellipsoid.

erect at anthesis;

sepals glabrous;

petals lavender to purplish, 6–8.5 × 1.5–3 mm, glabrous;

pollen ellipsoid or spheroid.

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

erect, straight, 3–8(–15) 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.

erect, appressed to rachis, not secund, straight, edges parallel, 3–5.6 cm × 1.5–2.5 mm;

valves glabrous;

ovules 34–64 per ovary;

style 0.1–0.7 mm.

uniseriate, 0.9–1.2 × 0.6–1 mm;

wing often continuous, 0.07–0.1 mm wide.

biseriate or sub-biseriate, 1.5–2 × 1–1.5 mm;

wing continuous, 0.3–0.5 mm wide.