RHI RHO 
RHO RHO 
AlectorOldphtts . Yellow . 7» H. A. Europe • . 1820 
Crista-galli . . Yellow . 7, H. A. Britain . . 
major .... Yellow . 7, H. A. Britain . . 
Trixag6, 1 . . . Yellow . 7. H. A. Europe . . 1800 
RhinopetalCm, Fischer. From rhin, nose, petalon, 
petal ; base of upper sepal. Linn. 6, Or. 1, Nat. Or. 
Liliacece. For culture and propagation, refer to 
the hardy species of Lilium. 
Karelini ... Pa. pk. spt. 1, H. Tu. P. Ural . . .1834 
RHiPiDor.ENDRON, WUldenoTV. From rhipis, a fan, 
and dendron, a tree ; in allusion to the growth. 
Linn. 6, Or. 1, Nat. Or. Liliacece. This genus may 
he referred to the Aloes for culture and propaga- 
tion. Synonymes ; \. R. disHchum^ Aloe plicatilis. 
plicatlle, 1 . . . Rea . . 6, G. Ev. S. Africa . . 1723 
majus . . . Red . . 6, G. £?. S. Africa . . 1723 
Rhipsai.is, Harvorth. From rhips, a willow branch ; 
in allusion to the flexible branches. Linn. 12, Or. 
1, Nat. Or. Cactacece. The plants of this genus are 
more singular than beautinil. A light vegetable 
soil, mixed with a little brick rubbish, suits them 
best ; and they are readily increased by cuttings. 
Synonymes: \. Cactus pendula. 2. C.funalis. 
Cassytha, 1 . . . Yellow . 9, S. Ev. S. W. Ind. . 1758 
cereuscula ... S. Ev. T. Brazil . .1829 
fasciculata . . . Grsli. wht. S. Ev. S. W. Ind. Is. 1817 
grandiflorii, 2 . . White . . 7, S. Ev. S. S. Amer. . 1818 
Hookerlana . . . White . . 8, S. Ev. S. W. Ind. . 
mesembryanthoides White . . S. Ev. S. S Amer. . 1817 
parasitica . . . Yellow . S. Ev. S. S. Amer. . 1800 
salicornoides . . Yellow . 6, S. Ev. S. E. Ind. . . 1817 
Rhizoctonia, Decandolle. From rhiza, a root, and 
kteino, to destroy ; the name is applied in conse- 
quence of its destroying the roots upon which it 
grows. Linn. 24, Or. 9, Nat. Or. Fungi. This 
species is found on Colchicum and the roots of the 
Crocus — R. CrocOrUm. 
Rhizoma, applied to roots which spread under 
ground, similar to those of the Iris. 
Rhizomorpha, Roth. From rhiza, a root, and morphe, 
form ; the appearance of the plants. Linn. 24, Or. 
9, Nat. Or. Fungi. The species of this genus are 
found beneath bark and in cellars — R. divSrgens, 
medullcirls, stibcorticdlis, subterrdned. 
Rhizophora, Linn. From rhiza, a root, and phoreo, 
to bear; the branches of this tree throw out roots 
very freely, which descend into the mud ; conse- 
quently, every branch being supported by its own 
roots, one tree may, in this manner, extend over a 
considerable space. Linn. 11, Or. 1, Nat. Or. Rhi- 
zophoraceae. The Mangrove may be tried in loam 
and sand, well mixed, and kept moist by the fre- 
quent application of salted water. It is difficult, 
if not altogether impossible, to cultivate it in this 
country. 
Mangle .... Pa. yel. . S. Ev. T. E. Ind. . . 1820 
Rhizopogon, Trinius. From rhiza, a root, and pogon, 
a beard. Linn. 24, Or. 9, Nat. Or. Fungi. This 
species is found by the waysides. Synonyms: 1. 
Lycoperdon gibbosum — R. dibits 1. 
Rhodanthe, Lindley. From rhodon, a rose, and an- 
thos, a flower; in allusion to the colour of the 
flower-heads. Linn. 19, Or. 1, Nat. Or. Compositae. 
This is one of the most delightful annuals ever 
introduced to our collections. To obtain flowering 
plants in March, the seed should be sown in 
August, in a compost of decayed leaf-soil and light 
maiden earth, in equtil parts, having the pots well 
drained. The seed-pots should not be placed in a 
lower temperature than 60 nor ever higher than 
80 degrees. The earth should never be allowed 
to become too dry, taking care to apply water of a 
temperature nearly equal to that of the house. 
They will require several shifts previous to flower- 
ing ; at the two last, viz. those in January and 
March, decayed manure should be substituted for 
leaf mould, and a small portion of white sand 
added to the compost ; a second sowing should be 
made in October and treated as the first, and they 
will flower beautifully the following May ; and if a 
final sowing is effected in March, the plants will 
be ready to plant out in the flower-garden in May 
or June, where they will flower during the au- 
tumnal months. After the pleints raised from any 
of the sowings have been potted, they should be 
removed to a much cooler house, and when pro- 
[ 269 ] 
perly established, placed on some elevated situation 
near the glass. Seed should be obtained from the 
plants grown in the greenhouse. 
ManglesS . . . Ro. yeL . 6, G. A. S. River . 1832 
Rhodiola, see Sediim. 
Rhododendron, Linn. From rhodon, a rose, and 
dendron, a tree ; because of the appearance of the 
terminal bunches of flowers. Linn. 10, Or. 1, Nat. 
Or. Ericacece. The Rhododendron is decidedly 
one of the finest of all known genera, containing 
some of the most handsome, elegant, and showy 
shrubs; all of which are admirably adapted either 
for ornamenting the greenhouse or shrubbery, or 
for planting singly on lawns. Peat soil is most 
suitable to these plants, but they may also be 
grown in very sandy loam, or vegetable mould. 
Propagation may be effected by layers or seeds ; if 
the latter mode be preferred, the seeds must be 
sown early in spring, in flat pans filled with peat 
soil, and the seed covered very slightly over; the 
pans should then be set in a close frame till the 
plants make their appearance, taking care to water 
very slightly when the soil appears dry. The 
seedlings having attained to a sufficient height, so 
as to admit of their being drawn without fear of 
injury, should be removed into other pots or pans, 
using the same kind of mould. After this removal 
they should be kept in a close frame till fresh roots 
are produced, and they may then, by degrees, be 
hardened to the air. The small-wooded kinds may 
be also increased very freely by young cuttings, 
planted in sand under a glass. The tender kinds 
may be easily propagated by young cuttings torn 
off close to the stem, planted in sand and plunged 
in heat under a glass. Synonymes : 1. R. aromati- 
cum. 2. R. cinnamomeum. 3. R. album. 4. R. 
Russellianum. 5. R. Nobleanum. 6. R. officinale. 7* 
R. azaleoides. 8. R. myrtifolium. 9. R. obtusum. 10. 
R. indicum Smithii, Azalea indica Smilhii. 11. R. 
Smithii. 12, Rhodora canadensis. 
albiflortim . . . AVhite . . 6, H. Ey. S. N. Amer. . 1835 
alta-clerensS . . Crimson . 5, H. Ev. S. Eng. hyb. . 
anthopogoD, 1 . . Purple . 5, F. Ev. S. Nepal . . 1820 
arbdreum . . . Scarlet . 5, F. Ev. S, Nepal , .1820 
cinnamomeum, 2 Purple . 6, H. Ev. S. Nepal . . 1820 
nlveum, 3 . . White . . 3, H. Ev. T. Nepal . . 1817 
rosetim . . . Rose . . 4, H, Er, T. Nepal . . 1817 
sanguineum . . Scarlet . 4, H. Ev. T. Nepal . . 1817 
undulattim . . Rich p. . 4, H. Ev. S. Eng. hyb. . 1829 
venustum . . Fk. spot. . 3, H. Ev. S. Eng. hyb. . 1829 
barbatum ... H. Ev, S. Nepal . . 1829 
campanulatum . Pa. pink . 5, F. Ev. S, Nepal . . 1825 
camtchAtIcum . Purple . H. Ev. S. Kamt. . . 1802 
catawblense . . Purple . H. Ev. S. N, Amer. . 1809 
Russellianum. 4 Bt. lo. . . 3, H. Ev, S. . 1829 
tigrinum . . Ro. spot. . 3, H. Ev. S. Hybrid , . 
Catesbaei . . . Purple . 5, H. Ev. S. N. Amer, . 1810 
caucasicum . . Purple . 8, H. Ev. S. Caucasus . 1803 
Nobleanum, 5 . Dp. red . 3, H. Ev. S. Hybrid . . 1832 
piilcherrimum . Fa. rose . 3, H. Ev. S. Hybrid . . 1832 
stramlneum . Straw . . 4, H. Ev. S. 
Chamaecistus . . Pa. pur. . 5, H. Ev. S. Austria . 1786 
chrysanthum, 6 . Yellow . 6, H, Ev. S. Siberia . . 1796 
dauricum . . . Purple . 3, H. Ev. S. Siberia . . 1780 
atrovirens . . Purple . 3, H. Ev. S. Siberia . . 
Farrerm . . . Lilac . . 3, H. Ev. S. China . .1829 
ferrugineum . . Scarlet . 6, H. Ev. S. Switzerl. . 1752 
album . . . White . . 6, H. Ev S. Pyrenees . 1830 
hybridum . . . Pink . . 7, H. Ev. S. 
hirsutum . . . Scarlet . 6, H. Ev. S. SwitzerL . 1656 
vari^gatum . . Scarlet . 6, H. Ev. S. . 1800 
lapponicum . . Crimson . 4, F. Ev. S. Lapland . 1825 
lepiddtum . . . Rose . . F. Ev. S. Nepal . . 1829 
maximum . . . Pink . . 7. H- N. Amer. . 1756 
album . . . White . . 7, H. Ev. S. 
hybridum . . Wht. pur. . H. Ev. S. Hybrid . .1830 
ponticum . . . Purple . 5, H. Ev. S. Gibraltar . 1763 
azaleoides, 7 • Pink . . 7» H. Ev. S. Hybrid . . 1820 
Lowii . . . White . . H, Ev. S. Eng. hyb. . 
myrtifdlium, 8 Purple . 5, H. Ev. S. Gibraltar . 1763 
obtusum, 9 . . Purple . 5, H. Ev. S. Armenia . 
odoratum . Pink . . 7, H. Ev. S. . 1820 
pulehrum, 10 . Rose . . 6, H. Ev. S. Eng. hyb. . 1827 
Smithii, 11 . . Crimson . 9, H. Ev. S. Eng. hyb. . 1826 
punctatum . . . Pink . . 7, H. Ev. S. N. Amer. . 1786 
majus . . . Pink . . 7, H. Ev. S. 
purpOreum . . Purple . 7> H. Ev. T. N. Amer. . 
Purshn . . . .White.’ . 7, H. Ev. s. N. Jersey .1811 
Rhodora, 12 . . Pa. pur. . 5, H. De. S. N. Amer. . 1767 
setosum . . . Purple . F. Ev. S. Nepal . . 1825 
Rhodomela, Agardh. From rhodon, a rose, and 
melos, a limb, colour of the fronds. Linn. 24, Or. 
