pecies,
introduced from Brazil in 1858; it is, however, a very slow grower,
plants ten years old being only a few inches in diameter. It should be
grown in stove temperature, in a basket of peat fibre, or, better still,
on a piece of soft fern-stem. It is always found on the branches or
trunks of trees when growing wild.

[Illustration: FIG. 90. RHIPSALIS SARMENTACEA.]

R. Swartziana (Swartz's).--Older stems three-angled, young ones
flattened, jointed; joints 2 in. broad, stiff with deep notches. Flowers
in the notches, small, white, produced in June. This species is a native
of Jamaica, and was introduced in 1810. A stiff, ungraceful plant, about
2 ft. high, very similar in its branches to a Phyllocactus. This species
requires the temperature of a stove.

R. trigona (triangular).--Habit straggling; branches usually in forks,
1/4 in. in diameter, three-angled; angles wavy or slightly notched,
grey-green. Flowers small, produced in spring in the notches of the
angles, white. Fruit a white berry. A thin, Brazilian plant, not unlike
a Lepismium, but without the silky hairs in the notches of the angles.
This species also requires to be grown in stove temperature.

CHAPTER XVII.

TEMPERATURES.

To enable growers to make a selection of species according to the
accommodation that can be afforded for Cactuses, all that are described
in this book are here classified in three groups: (1) Species which
thrive in a cool-house or frame; (2) Species which can only be
successfully grown in a warm house or stove; and (3) Species which are
hardy in the more favoured portions of the United Kingdom.

COOL-HOUSE OR FRAME.

Temperature: Summer, that of the open air.
Temperature: Winter--day, 50 deg. to 60 deg.; night, 40 deg. to 45 deg.

Cereus Berlandieri.
" Blankii.
" caespitosus.
" cirrhiferus.
" ctenoides.
" enneacanthus.
" flagelliformis.
" Leeanus.
" leptacanthus.
" multiplex.
" paucispinus.
" pentalophus.
" polyacanthus.
" procumbens.
" reductus.
Cereus speciosissimus
Echinocactus brevihamatus
" centeterius.
" cinnabarinus.
" Cummingii.
" echidne.
" Emoryi.
" gibbosus.
" hexaedrophorus.
" Leeanus.
" Mackieanus.
" mamillarioides.
" rhodophthalmus.
" texensis.
" uncinatus.
Echinocactus viridescens.
Echinopsi