Flora of North America species comparison

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

a thickened crown, branched.

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

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

blade margins entire.

blade margins sinuate-dentate or entire.

(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.

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

valves pubescent inside;

ovules 4 per ovary;

style frequently curved.

= 10.