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mirabilis jalapa
From The Collaborative International Dictionary of English v.0.48:
Jalap \Jal"ap\, n. [F., fr. Sp. jalapa; -- so called from Jalapa, a town in Mexico, whence it was first obtained.] (Med.) The tubers of the Mexican plant Ipom[oe]a purga (or Exogonium purga) of the family Convolvulaceae, a climber much like the morning-glory. The abstract, extract, and powder, prepared from the tubers, are well known purgative (cathartic) medicines, and are also called jalap. Other species of Ipom[oe]a yield several inferior kinds of jalap, as the Ipom[oe]a Orizabensis, and Ipom[oe]a tuberosa. [1913 Webster] False jalap, the root of Mirabilis Jalapa, four-o'clock, or marvel of Peru. [1913 Webster] .
From The Collaborative International Dictionary of English v.0.48:
marvel of Peru \marvel of Peru\, marvel-of-Peru \marvel-of-Peru\ n. (Bot.) A common garden plant (Mirabilis jalapa or {Mirabilis uniflora}) of North America having fragrant red or purple or yellow or white flowers that open in late afternoon; called also four-o'clock. See four-o'clock. Syn: common four-o'clock, marvel of Peru, Mirabilis jalapa, Mirabilis uniflora. [WordNet 1.5]

