romerillo

from The Century Dictionary.

• noun A plant, Heterothalamus brunioides, whose flowers yield a yellow dye; also, the dye thus produced. See Heterothalamus.
• noun In Mexico, a name applied to several composites with an agreeable aromatic odor, especially to Chrysactinia Mexicana, Porophyllum scoparium, and Pectis stenophylla, all of which are used medicinally. The last species has a strong odor of lemon, and together with several of its congeners is sometimes called limoncillo. See limoneillo, 2.
• noun One of the Mexican milkweeds, Asclepias Linaria; also called romerillo loco.
• noun A plant belonging to the family Chenopodiaceæ, Dondia multiflora, the fleshy leaves of which are used in Mexico during the Lenten season as a potherb.
• noun In Chile, Tricondylus ferrugineus, a shrub belonging to the family Proteaceæ.