E. tricolor (three-coloured).—Tube salmon-red; petals red, centre purplish.
E. violaceum (violet).—Tube white; petals carmine, margined with violet-purple.
CHAPTER VI.
THE GENUS PHYLLOCACTUS.
(From phyllon, a leaf, and Cactus).
S in the case of the Epiphyllums, the principal character by which the Phyllocactus is distinguished is well described by the name, the difference between it and Epiphyllum being that in the former the flowers are produced along the margins of the flattened branches, whereas in the latter they are borne on the apices of the short, truncate divisions. If we compare any of the Phyllocactuses with Cereus triangularis, or with C. speciosissimus, we shall find that the flowers are precisely similar both in form and colour, and sometimes also in size.