such as the
white, crimson-spotted _C. lusitanicus_, the pink-flowered _C.
villosus_, the bright-red _C. crispus_, and the pure white _C.
florentinus_, which are quite happy in sheltered rock walks especially
by the sea; they have been also grown with success in many colder
situations inland. The Cistineae, at best, are somewhat short-lived, and
lose vigour and power of resistance as they grow older. Keep up,
therefore, young, thrifty stock by yearly cuttings to fill up inevitable
gaps, which is a matter of no cultural difficulty. Where Rock Roses are
out of the question, their place may worthily be filled by the hardier
shrubby _Helianthemums_, though they differ greatly from Cistineae in
their trailing habit and smaller flowers. The breadths of brilliant
colour given by these Sun Roses while in bloom are invaluable, and may
be enjoyed to the full in almost any locality, while the many variations
of tint, from deep green to ashen grey, in their leafage should also be
taken into consideration, as it increases their usefulness when out of
flower.

No list of good shrubs for the Rock Garden would be complete without
some reference to _Yuccas_, which for all practical purposes must be
included under that head. Groups of these magnificent plants, with their
sub-tropical effect, cannot be surpassed for nobility of outline and
stateliness of flower. To do them full justice, they must have space to
develop their grand proportions, but this may often be found on the
ridge or upper slope, even in rock-work of limited character. _Y.
gloriosa_, with its fine form, _Y. recurva_, and the stemless _Y.
flaccida_, of smaller growth, are amongst the best and hardiest kinds,
and to these may be added _Y. angustifolia_, another valuable and nearly
stemless species.

It is only possible, in restricted space, to touch in a very cursory way
upon a few of the available groups of dwarf-growing shrubs. Many more
than have been mentioned will occur readily to the minds of those who
are at all conversant with plants, such as _Abelia rupestris_, _Magnolia
stellata_, several beautiful species of _Daphne_, some of the St. John's
Worts, of low-growing _Cytisus_, and others which may be classed under
the head of miscellaneous. The subjoined list, though it does not
pretend to be exhaustive, will be found of use, either for purposes of
winter greenery or for summer embellishment, by those who are seeking
good and suitable dwarf shrubs for planting, u