Flora of North America species comparison

usually 2–7 per caudex branch, arising from margin of rosette near ground surface, 0.5–2(–3) dm, densely pubescent proximally, trichomes simple and stalked, 2-rayed, 0.3–0.8 mm, glabrous distally.

1 to several per caudex branch, arising from center of rosette or arising laterally proximal to sterile shoots, somewhat elevated on woody base or from ground surface, 2–5(–9) dm, usually glabrous proximally, rarely sparsely pubescent, trichomes simple and short-stalked, 2- or 3-rayed, 0.1–0.5 mm, glabrous distally.

blade narrowly oblanceolate, 1–3 mm wide, margins entire, ciliate, trichomes to 1 mm, surfaces pubescent, trichomes stalked, 2–4-rayed, 0.3–0.8 mm.

blade oblanceolate, (3–)5–15 mm wide, margins dentate, ciliate at least along petiole, trichomes to 1 mm, surfaces pubescent, trichomes short-stalked, 2–6-rayed, 0.1–0.5 mm.

3–7(–10), not concealing stem;

blade auricles 0.2–1 mm, surfaces of distalmost leaves glabrous.

5–17(–21), sometimes concealing stem proximally;

blade auricles 0.5–3.5(–5.5) mm, surfaces of distalmost leaves glabrous.

6–15-flowered, unbranched.

10–30(–70)-flowered, usually unbranched.

ascending at anthesis;

sepals pubescent;

petals white or lavender, 5–7 × 1.5–2.5 mm, glabrous;

pollen spheroid.

ascending at anthesis;

sepals glabrous;

petals lavender, 6.5–8.5 × 1–2.5 mm, glabrous;

pollen spheroid.

horizontal to divaricate-ascending, straight, 3–9 mm, glabrous.

horizontal, gently curved downward, 10–27 mm, glabrous.

horizontal to divaricate-ascending, not appressed to rachis, not secund, usually strongly curved, edges parallel, 3.5–6.5 cm × 1.7–2 mm;

valves glabrous;

ovules 50–84 per ovary;

style 0.05–0.5 mm.

widely pendent, not appressed to rachis, not secund, usually curved, edges parallel, 3–7 cm × 1.8–2.5 mm;

valves glabrous;

ovules 100–160 per ovary;

style 0.2–0.5 mm.

uniseriate, 1.5–2 × 1.1–1.5 mm;

wing continuous, 0.1–0.2 mm wide.

sub-biseriate, 1.1–1.6 × 0.9–1.1 mm;

wing continuous, 0.1–0.2 mm wide.