DALEA (named after Dr. Samuel Dale, an English botanist of the last century, and author of a book on Materia Medica). ORD. Leguminosae. A genus of greenhouse herbs, sometimes suffruticose at the base, often beset with glandular dots. Leaves impari - pinnate, having the terminal leaflet sessile. Flowers purplish-blue, whitish, or rarely yellow, disposed in pedunculate spikes, which are opposite the leaves. More than a hundred species are known. The headquarters of the genus is Mexico, a few only being found in Chili and the Andes. For culture, see Psoralea. DALEA alopecuroides (Alopecurus-like). fl. whitish, in dense cylindrical silky-villous spikes. Summer. l. of many linear-oblong leaflets. h. 1ft. to 2ft. United States. Annual. DALEA bicolor (two-coloured). A synonym of DALEA mutabilis DALEA mutabilis (changeable). fl. at first white, but ultimately changing to violet; spikes cylindrical, at length becoming much elongated, pedunculate. October. l. with five to ten pairs of obovate or obcordate leaflets. h. 1 1/2ft. Mexico, 1818. Plant erect, branched. Perennial. SYN. DALEA bicolor. (B. M. 2486.) DALEA Mutisii (Mutis's). fl. deep blue, disposed in dense cylindrical heads, which are about 1 1/2in. long. July. l. with eight to ten pairs of elliptic-oblong, obtuse leaflets. h. 2 1/2ft. to 3ft. South America, 1828. An elegant greenhouse perennial. SYN. Psoralea Mutisii.