large flower-pots over the plants to
bleach them; but if forced in a frame the light need not be excluded.
None but the earliest kinds should be selected for forcing.

Rhubarb, Chilian.--_See_ "Gunnera."

Rhus (_Sumach_).--Lovely shrubs, growing in any ordinary soil. The
young shoots of R. Cotinus are clothed with round leaves which
change to bright crimson and orange, surmounted with fluffy pink
seed-vessels, while R. Glabra Laciniata resembles a tree fern. They
may be propagated either by layers or cuttings. Height, 8 ft. to 10
ft.

Rhynchospermum (Trachelospermum) Jasminoides.--A pretty, evergreen,
woody climber for the conservatory, which succeeds best in a compost
of light loam and peat; is of easy culture, and readily increased by
cuttings. It is a fine plant for rafters or trellis, and produces in
July deliciously fragrant white flowers at the ends of the branches.
Height, 10 ft.

Ribes (_Flowering Currants_).--Well-known shrubs, growing in any soil,
and flowering early in spring. The colours vary from crimson to white.
They may be raised from cuttings either in autumn or early spring.
Height, 4 ft.

Richardia Aethiopica.--A fine herbaceous perennial with very bold
leaves. It needs a good supply of water, and on dry soils should be
planted in trenches. A light, rich mould is best for it, and it should
have sufficient sun to ripen the wood. Lift it in September and winter
in the greenhouse. It is increased from off-sets from the root, and
flowers in March. Height, 2 ft.

Ricinus, or Palma Christi (_Castor-oil Plant, etc._).--The foliage of
these half-hardy annuals is very ornamental. The plants like a rich
soil. Sow the seed early in spring in a slight heat, harden off
gradually, and put out at the end of May in a warm, sheltered spot.
They may also be propagated by cuttings. Height, 3 ft. to 6 ft.

Robinia.--All these shrubs have fine, Fern-like foliage which changes
colour in autumn. The Pea-shaped flowers vary in colour from cream to
purple, and while in bloom the plants are very handsome. They grow
in any soil, flower in May and onwards, and are increased by layers.
Height varies, the Rose Acacia _(Hispida)_ reaching 10 ft., while the
Locust Tree (_Pseudo-Acacia_) grows to the height of 40 ft.

Rock Cress.--_See_ "Arabis."

Rocket (_Hesperis_).--The hardy perennials like a light, rich soil,
and need to be frequently divided. The best time to divide them is
just after they have done flowering, when