Among -the best perennial species of CEnothera the following are grown for sale: fruticosa, 2-3 ft., yellow, with a fine deep - coloured form called Youngi, and a semi - double one; eximia (caespitosa), 9-12 in., white; glauca and Fraseri, 2 ft., rich yellow, glabra, with crimson - tinted stems and leaves and yellow flowers: Howardi, trailing, with yellow flowers, changing to rich orange scarlet in hot situations; missouriensis (macrocarpa), trailing, with yellow flowers, 4-5 in. across; speciosa, 2-3 ft., white, with one or two fine varieties.