A dictionary of modern gardening - University Library

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ROC 508 ROO
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applied to the
painter's brush.
Btones with a large nobilis; Phlox ovata; P. subulata ; P.
The spaces between nivalis; Vinca minor, florepleno; Camthe
stones having been filled with rough panula pumila ; Gentiana verna ; Dryas
mortar prevents the cement from being octopetala; Digitalis lutea; Sibthorpia
wasted. The thickness of the latter on europsa ; Arabis alpina; Draba azoides;
the stones need not be more than the Premanthes purpurea; P. Muralis ;
eighth of an inch: it will unite the Antennaria plantaginea ; Gnaphalium
whole into one mass; and rock-work, arenanum ; Polypodium vulgare camthus
constructed, is beyond all compa- bricum ; P. dryopteris ; Onoclea sensirison
far more natural than that made bills ; Asplenium adiantum nigrum ;
in the usual way. It has none of that Pteris caudata ; Adiantum Capillus
disjointed appearance which usually ac- veneris ; Aspidium rigidum; A. Loncompanies
rock-woA made without chitis.
cement. After a few months' exposure RODRIGUEZIA, Six species. Stove
to the weather, rock-work thus formed orchids.
ROELLIA.
Division. Peat and wood,
(if skillfully made) cannot without care-
Six species. Chiefly
ful examination be distinguished from a 'green-house evergreen shrubs. R. de-
ratural mass; it will soon cover all hut \currens, a half-hardy annual ; R. mu-
the most prominent parts. If the ce- j cosa, an herbaceous perennial. Seed,
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ment be of a colour too light, which, or young cuttings. Sandy loam and
for some situations, may be the case, a peat.
little lamp-black, or soot, may be mixed R. ciliata is a Cape plant, and rewith
it. Care must, however, be taken quires a green-house in this country,
that no substance which may make the !
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It should be potted in light rich soil,
cement more porous is used, otherwise such as a mixture of peat, leaf-mould,
it will peel from the stones after a hard
frost. For the benefit of those who
sand, and loam. Keep it rather dry
when it is not growing, but give it plenty
are not accustomed to using cement, I
may mention that no more should be
moistened at once than can be used in
of water at other times.
RCEPERA.. Two species. Greenhouse
evergreen shrubs. Young cut-
a short time. If the cement be good it tings or seeds. Loam, peat, and sand.
will quickly harden, and will then be in R. aurantiaca will flower in an open
a manner useless.
" In preserving cavities in the rock
for plants, care should be taken that no
border.
ROLANDRA argentea. Green-house
evergreen shrub. Cuttings. Loam and
places are left in which the water may
lodge, or, in frosty weather, the ice, by
expansion, would split and peel off the
peat.
ROLLER. This is best made of castiron,
and may be had of four different
thin crust of cement, or lowest part of sizes, viz. with a diameter of sixteen,
them, communicating with the soil be- eighteen,
neath the stones, so that the water may
drain off.
" In making artificial rock for waterfalls,
or other constructions, where the
twenty-two, or twenty-four
cement may be constantly exposed to
the action of water, the best water-cement
should be used. Any preparation
that does not quickly indurate under
water, will, in a short time, be washed
away, and leave nothing but the bare
stones." Whateley.
Plants suited for Rock-work are :
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inches. The roller and water-engine,
where either the lawns or roads are
extensive, may be combined advantageously.
RONDELETIA. Eleven species.
Stove evergreen shrubs. Cuttings.
Loam, peat, and sand.
ROOTS are either annual, biennial,
or perennial, but in all roots, and under
any mode of management, the fibrous
parts (radiculjB) are strictly annual ; they
decay as winter approaches, and are
Rhododendron ferrugineum; R. hirsu- produced with the returning vigour of
tum; Arctostaphylos Uva ursi ; Chamoeledron
procumbens ; Sedum rupes-
their parent in the spring. Hence the
reason that plants are transplanted with
tre ; S. Forsterianum S. popullfolium ; most success during the season of their
;
S. villosum ; S. hexangulare ; Arbutus decay : for, as the root almost excluphillyres.folia
; A. pilosa Mahonia aqui- ; sively imbibes nourishment by the
folium; Ramondia pyrenaica; Soldanella mouths of these fibres, in proportion as
alpina; Androsace villosa ; Crydalis they are injured by the removal, so is