What does "dutchman" mean?

Dutchman: A native, or one of the people, of Holland. Dutchman's breeches (Bot.), a perennial American herb (Dicentra cucullaria), with peculiar double-spurred flowers. See Illust. of Dicentra. -- Dutchman's laudanum (Bot.), a West Indian passion flower (Passiflora Murucuja); also, its fruit. -- Dutchman's pipe (Bot.), an American twining shrub (Aristolochia Sipho). Its flowers have their calyx tubes curved like a tobacco pipe.