RODRIGUEZIA. 
353 
RONDELETIA. 
a mixture of bricks, flints, pieces | Orchideous Epiphytes, natives of 
of granite, freestones, and perhaps | tropical South America. 
marble, shells, fragments of carved 
stone, and even roots, which are 
not unfrequently seen in even the 
best gardens. Rockwork should 
always be an independent feature. 
It rarely looks well when piled up 
against a wall, or around the roots 
of a tree, or in any situation where 
it is overshadowed by trees; in 
short, where it does not form the 
prominent feature in the scene. 
looks well near water and merging 
into it, or in an open airy garden, 
where it is surrounded by a gravel- 
walk ; but it does not look so well 
when rising from turf, without an 
adjoining walk, or when large shrubs 
grow upamong the stones. Where 
there are collections of such plants 
as Saxifrages or other alpines, or 
of Cistuses, Helianthemums, or other 
mountain shrubs, rockwork is very 
desirable ; and in such cases it may 
be placed on a lawn, as a feature in 
a general collection of herbaceous 
plants or shrubs arranged according 
to the natural system; but rock- 
work as an ornamental object, or as 
a nidus for a miscellaneous collec- 
tion of plants, should always be in 
an open airy situation, near a pond, 
or surrounded by a walk. In short, 
it may be laid down as a general 
principle that reckwork should either 
adjoin gravel or a piece of water; 
and that it should seldom or never 
adjoin trees or grass, or walls or 
buildings. 
One of the most common faults 
in rockwork is the indiscriminate 
mixture together of all sorts of 
stones, bricks, shells, fragments of 
statuary or sculpture, and even 
roots of trees; which latter object, 
though very suitable as receptacles 
_ for plants, should always be ar- 
sanged in masses, apart from any 
intermixture of stones——See Roor- 
WoRK. 
RopriguEe za. — Orchidacee. — 
30* 
It | 
R. se- 
cunda has beautiful pink flowers ; 
but the other species have generally 
drooping racemes of greenish-yellow 
flowers, more graceful than _posi- 
tively beautiful. All the kinds 
should be grown in moss, and they 
all succeed better on wood than in 
pots.—See Orcut’peous Epi'puyTes. 
Roe'tia. — Campanuldcee. — 
Cape plants, generally with blue 
flowers, which have somewhat of 
the dazzling glossy hue of Venus’s 
Locking-glass: The shrubby kinds 
are of low growth, and rather diffi- 
cult to propagate; but the annual 
species are of very easy culture, 
and only require the usual treat- 
ment of half-hardy annuals.—See 
ANNUALS. 
Rane'r1s.— Papaveracee.— The 
Purple Horned-Poppy. This is a 
very beautiful flower; but, unfortu- 
nately, its beauty is so very short- 
lived that it is difficult to find a 
perfect flower, as one or two of its 
petals drop almost as soon as the 
flower expands. It is quite hardy, 
and only requires to have its seeds 
sown in the open border in April. 
Rouiinc.—Gravel walks cannot 
be kept in proper order without fre- 
quent rolling; and this rolling is 
most efficacious when the ground is 
moist below, but the upper surface 
is dry. On this account the best 
time for rolling is a fine dry day 
after two or three days’ rams, and 
when rolling is necessary in con- 
tmued dry weather, the walk should 
be previously watered. Turf should 
also be rolled occasionally, to pre- 
vent its surface from becoming un- 
even. 
RonpbE.Le t14.—- Rubidcee.—Beau- 
tiful stove plants, with white, blue, 
er reddish flowers, natives of the 
East and West Indies. R. odorata, 
which is the most common, has 
terminal corymbs of scarlet flowers 
greatly resembling those of Izora 
