Flora of North America species comparison

usually 2–5 per caudex branch, arising laterally proximal to sterile shoots or rosette, often elevated above ground surface on woody base, (1.5–)2–7 dm, densely pubescent proximally, trichomes short-stalked, Y-shaped, 0.2–0.4 mm, often mixed with 3–5-rayed or (rarely) simple ones, usually glabrous distally.

usually 1 per caudex branch, arising from center of leaf tuft, above ground surface on woody base, 2–5.5 dm, densely pubescent proximally, trichomes short-stalked, 4–7-rayed, 0.1–0.4 mm, similarly pubescent distally.

blade oblanceolate to obovate, 3–15(–20) mm wide, margins dentate, ciliate proximally, trichomes to 1.2 mm, surfaces moderately to densely pubescent, trichomes short-stalked, 3–6-rayed, 0.2–0.4 mm.

blade linear to linear-oblanceolate, 2–3(–4) mm wide, margins entire, sometimes ciliate near petiole base, trichomes (simple or 2-rayed), to 0.8 mm, surfaces densely pubescent, trichomes short-stalked, 4–8-rayed, 0.1–0.3 mm.

4–12(–17), not concealing stem;

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

7–18, concealing stem proximally;

blade auricles absent, surfaces of distalmost leaves densely pubescent.

16–35-flowered, usually unbranched.

6–26-flowered, usually unbranched.

ascending at anthesis;

sepals pubescent;

petals white to purplish, 5–9 × 1–1.5 mm, glabrous or sparsely pubescent (occasionally some trichomes abaxially);

pollen ellipsoid.

divaricate at anthesis;

sepals pubescent;

petals white to pale lavender, 8–18 × 2.5–4.4(–5.5) mm, glabrous;

pollen ellipsoid.

usually horizontal, straight or slightly recurved, (6–)10–25 mm, usually glabrous.

horizontal to descending, usually recurved, 5–10(–20) mm, pubescent, trichomes appressed, branched.

widely pendent, not appressed to rachis, not secund, usually curved, edges parallel, (3–)4–7 cm × 1.7–2.1 mm;

valves glabrous;

ovules 60–96 per ovary;

style 0.05–0.4 mm.

divaricate-descending to reflexed, usually not appressed to rachis, rarely somewhat secund, straight, edges parallel, 4.3–7 cm × 1.6–3 mm;

valves pubescent throughout;

ovules 72–98 per ovary;

style ca. 0.1 mm.

uniseriate, 1.1–1.5 × 0.9–1.2 mm;

wing continuous, 0.1–0.2 mm wide.

biseriate, 1.2–1.6 × 1–1.2 mm;

wing continuous, 0.1–0.2 mm wide.

= 14.

= 14.