Evolvulus
(from evolvo, to untwist; to distinguish it from Convolvulus, many of the species of which are twiners). ORD. Convolvulaceae. Stove, annual or perennial, prostrate or creeping, rarely erect herbs. Peduncles axillary, one or few-flowered; corolla subrotate, campanulate, or funnel-shaped, plicate. Leaves entire. There are about seventy known species, distributed throughout all tropical regions, but most of them are natives of Brazil. The species described below is the only one worthy of mention here. For culture, see Convolvulus.
E. purpureo-caeruleus (purple-blue). fl. purplish-blue, terminal on the leafy branches, pedicellate; corolla rotate, rich ultramarine-blue, with the centre white, and a purple ray diverging from that up the centre of each lobe. July and August. l. small, lanceolate, acute, entire. Stem quite woody below, and often about half-way up. h. 1 1/2ft. Jamaica, 1845. Perennial. (B. M. 4202.)