Flora of North America species comparison

blade margins ± entire, (sometimes slightly lobed or widened at base).

blade margins entire.

not secund, loose and elongated in fruit, or dense in alpine forms.

secund, ± dense and compact in fruit.

usually sigmoid.

sigmoid.

slightly wider than long, apex truncate or retuse;

valves pubescent inside;

septum ± perforate;

ovules 4(–8) per ovary;

style to 7(–9) mm.

as wide as or longer than wide, apex rounded-acute;

valves glabrous inside;

septum complete;

ovules (6–)8–12 per ovary;

style (4–)4.5–6.5 mm.

yellow.

yellow.