Arisaema — Jack-in-the-pulpit, green dragon

Three can be found in Delaware.

Five or more leaflets; long, tapering spadix extends past the spathe

Arisaema dracontium, Green Dragon
Rare native, Piedmont only

Three leaflets; blunt spadix covered by the spathe

Arisaema triphyllum subsp. triphyllum, Swamp Jack-in-the-pulpit
Native, Piedmont & coastal plain
"Leaves glaucous beneath at maturity; spathe hood green, or green striped with purple"; spathe tube not fluted.

Arisaema triphyllum subsp. pusillum, Small Jack-in-the-pulpit
Native, Piedmont & coastal plain
"Leaves green beneath at maturity; spathe hood solid green or solid purple"; spathe tube fluted.

Also see http://www.theprimrosepath.com/Featured_Plants/Arisaema_triphyllum/triphyllumcomplex.htm

Sources: The Flora of Delaware, Weakley's Flora, William A. McAvoy.

Delaware Wildflowers main page