INDEX. 
279 
the Indian species not yet introduced, 169 ; 
propriety of partially exposing a few of them 
in autumn, 192 ; close relation of some of the 
genera, 207 ; small specimens or peculiar 
species require constant stimulation, 168, 240 ; 
winter management of the tribe, 264 
Osbeckia canescens, 91 
Ovarium, partitions of the, 233 ; either apocar- 
pous or syncarpous, 233 ; explanation of the 
terms superior and inferior as applied to it, 
163, 234 
Ovules, varieties of position assumed by the, 
257 
Oxalis Barrelieri, 94 
— geniculata, 215 
P. 
Palms, tissue and ordinary structure of, 38 
Pandanus, singular habits and conformation of 
the species of, 38 
Panicle of flowers, the mode of development 
termed a, 162 
Passifiora mooreana, 19 
— verrucifera, 212 
Pelargoniums, different divisions of, 33 ; their 
culture detailed, 33, 60, 85, 108 
Pentlandia miniata ; vars. lacunosa and Suliva- 
nica, 19 
Perianth, composition of the, 231 
Pericarp, most prominent features of the, 258 
Perneyttia angustifolia, 261 
Phaius grandifolius, var., 46 
Phaloenopsis amabilis, 49 ; approved system of 
growing, 50 
Phlogacanthus curviflorus, 67 
Phlox Coldryana, 197 
Phlox, chief points in the cultivation of the 
genus, 198 ; some species make the finest dis- 
play when planted in beds, 198 
Picea, soil suitable for the species of, 65 
Pimelea nana, 190 
Pinus, general treatment of the genus, 62 
Plant houses, monthly management of, 24, 71, 
96, 120, 144, 168, 192, 216, 239, 264 
Platystemon californicura, nearly hardy, 118 
Plumule, constituents of the, 259 
Pollen, consistence of, 233 
Polypetahe, chief characteristics of, 231 
Portulaca, mode of cultivating the species of, 
256 
Portulaca Thellusonii, 140 
Potting plants, principles to be attended to in, 
34, 47 
Pourretia ccerulea, 42 
Propagation, period at which it is usually per- 
formed, 72 
Propagation of hardy shrubs, most suitable 
season for the, 23 
Propagation by grafting, 201 ; rationale of the 
process, 202 ; its application and usefulness, 
203 ; most appropriate system, 204 
Propagation, likely manner in which the common 
methods originated, 201 
Protection of plants, principles by which it should 
be regulated, 132, 133 
Pruning, origin and primary application of, 11 ; 
chiefly necessary for hybrids, 11 ; few genuine 
species require it, 1 1 ; time for effecting it on 
hardy shrubs, 23; errors in its practice, 23 
Puya ccerulea, 42 
R. 
Raceme of flowers, the arrangement peculiar 
to a, 162 
Radiation of heat, winds instrumental in causing 
it, 82 ; manner in which it is effected, 131 ; 
its interruption the proper way of protecting 
plants, 132 
Radicle, importance of noticing its direction, 
258 
Refraction of heat, way in which it occurs, 131 
Rhizoma, a modification of the stem, 112; its 
peculiarities, 113 
Rhododendron arboreum ; cinnamomeum, flori- 
bus roseis, 236 
Rhododendron guttatum, 118 
Ribes, the species of, most readily propagated by 
slips, 23 
Rigidella fiammea, 67, 247 ; singular properties 
and culture of, 248 
Rodriguezia crispa, 212 
Roella ciliata, 245 ; way to bring it to perfection, 
246 
Roots, probable origin of, 39 ; their distinction 
from stems, 112; necessity for disposing 
them properly in transplantation, 95 
Roses, hints on pruning, 11 ; directions for 
budding, 1 68 ; advantages of grafting some of 
the scarcer kinds, 205 
Rudiments of the Natural System of Botany, 3 6 3 
111, 161, 231 
Russelia juncea, remarks on, 229 ; heath soil 
requisite for, 230 
S. 
Saccolabium denticulatum, 145 ; management 
of, 146 
Sage, Linaria-like, 77 
Salts, their presence in soils detectable by the 
taste or by evaporation, 105 
Salvia linarioides, 77 ; culture and multiplication 
of, 78 
Sand, utility of blending it with the compost for 
exotic plants, 254 
Satyrium pustulatum, 67 
Science of Horticulture, 129 
Scotch Roses, should not be much pruned, 13 ; 
plan of growing Mimulus moschatus among 
them, 14 
Seedling plants, less hardy if raised in artificial 
heat, 136 ; method of testing the same, 137 
Seeds, exposure necessary to ripen, 119; their 
hardihood affected by maturation in heat, 136 ; 
observations on their germination, 144 ; differ- 
ences in the time of their vegetation accounted 
for, 144 ; suggestions for collecting and stor- 
ing, 190 ; the earliest means by which plants 
were increased, 201 ; their organization, 258 ; 
those usually thought naked not really so, 258 
Senecio Heritierii ; var. cyanopthalmus, 236 
