Flora of North America species comparison

a thickened crown, branched.

thickened, usually simple, rarely branched, (subterranean).

several from base, exserted to nearly covered with basal leaves (densely clustered), erect or decumbent.

usually simple, rarely few from base, well-exserted, prostrate to decumbent.

blade margins sinuate-dentate or entire.

blade margins entire.

(strongly latiseptate), compressed at margins and apex, apex (acute), often beaked;

valves pubescent inside;

ovules 4 per ovary;

style frequently curved.

(slightly longer than broad), not conspicuously compressed at margins, apex somewhat compressed and usually not conspicuously beaked;

valves usually glabrous, sometimes sparsely pubescent inside;

ovules 8–12 per ovary;

style usually straight.

= 10.