R. myosurus (mouse-tailed); Bot. Mag. 3755.
Detail from Cactus Culture – Watson 1889
Stems dependent, several feet long, branching freely, jointed, with
three or four angles or wings; the angles flattened, reddish, notched
in the margin, and bearing a tuft of white, silky hairs in each
notch. Flowers small, yellow, tinged with red, springing from the
notches; produced in July. Fruit not seen. A native of Brazil; introduced
in 1839. This species resembles some of the angular-stemmed kinds
of Cereus. It grows freely and flowers annually, if planted in a
basket of fibrous soil, and suspended near the glass in a warm greenhouse
or stove. It is attractive even when not in flower, owing to the
form of its stems and the tufts of long, silky, white hair which
spring from the notches. Syn. Lepismium myosurus.