278 
INDEX. 
Lselia rubescens, 164 
Lselias, succeed best on blocks of wood, 194 ; 
may be slightly exposed in autumn, 192 
Lalage ornata, 94 
Language, precision in its use of great moment 
in botanical matters, 111, 161 
Larkspur, double-flowered Chinese, 171 
Lasiandra petiolata, 19 
Layering hardy shrubs, proper time for, 23 
Layering plants, probable origin of the practice 
of, 201 
Leaves, their difference of conformation, outline, 
and venation, employed in defining the natural 
orders, 113 ; value of the manure which 
decayed ones furnish to the trees or shrubs 
that shed them, 263 
Lemonia spectabilis, 235 
Liatris propinqua, 236 
Life, tenacity of, in plants, 136 
Lilacs, impropriety of reducing the branches of, 23 
Lilium Thur,bergianum, 166 
Lime, present in the sap of the grape-vine, 130 
Lisianthus Russellianus, the temperature of a 
stove requisite for, 14 ; a decided perennial, 
14 ; fittest system of training, 15 ; its propa- 
gation, 16 
Loam, mode of testing the adhesiveness of, 255 
Lobelia, new species of, 119 
— Tupa, 214 
Lopezia lineata, 164 
Loudon's Arboretum et Fruticetum Britanni- 
cum, strictures on, 134 
Lupines, season for staking, 120 
Lupinus leptocarpus, 164 
M. 
Mahonia glumacea, 55 ; mode of treating, 56 
Malva campanulata, 1 1 8 
— purpurata, 186 
Mammillaria, treatment of the genus, and its 
allies, 260 
Mandevilla suaveolens, 42 ; succeeds most per- 
fectly when planted out in a conservatory, 42 
Marica humilis ; var. lutea, 165 
Maxillaria cucuUata, 42 
Melocactus, ordinary culture of the genus, 206 
Mesembryanthema, necessity for frequently pro- 
pagating, 250 ; many of the species almost 
hardy, 138 
Miltonia Candida, var. flavescens, 90 
— Clowesii, 214 
— Russelliana, 217 ; peculiar culture of, 
218 
Miltonia spectabilis, 97 ; aspect and cultivation 
of, 98 ; varieties of, 97, 189 
Miltonia, distinctive traits of the genus, 98 
Mimulus moschatus, method of filling up beds 
of roses with, 14 
Mirbelia speciosa, 70 
Monachanthus Bushnani, 261 
— longifolius, 212 
— roseo-albidus, 115 
Monopetalse, character of, 231 
Morina longifolia, 139 
Myanthus spinosus, 140 
N. 
Nature, importance of studying the procedure 
of, 206, 226 ; some trifling modifications of it 
always advantageousinartificial circumstances, 
71, 225 
Natural orders, necessity for examining more 
than one peculiarity in acquiring a knowledge 
of them, 40, 259 ; isolated characters illusory, 
40, 258 
Natural System of Botany, rudiments of the, 36, 
HI, 161, 231, 257 
New and rare plants figured in the leading 
botanical periodicals, sketches of, 17, 40, 66, 
88, 114, 139, 163, 184, 210, 234, 260 
New, rare, or interesting plants which have 
bloomed in the metropolitan nurseries 
throughout tha year, 20, 44, 68, 91, 116, 141, 
166, 187, 213, 236, 261 
New plants, their true character often imperfectly 
known for a long time, 199 
Night air, generally prejudicial to tender exotics, 
192, 228 
Nuttallia grandiflora, size to which it attains in 
a favourable position, 32 
Nuttallia malvseflora, 31 ; treatment desirable 
for, 32 
O. 
Odontoglossum maculatum, 116 
Old and ornamental plants, attention called to, 
21, 70, 101, 123, 127, 147, 149, 219, 221, 
245 
Onagracese, essential characteristics of the order, 
182 
Oncidium deltoideum, 262 
— hastatum, 190 
— ' Huntianura, 140 
— leucochilum, 241 ; thrives most suc- 
cessfully in moss, 242 
Oncidium pachyphyllum, 165 
— pubes, 70 
Operations for January, 274 
— February, 23 
— March, 46 
— April, 71 
— May, 95 
— June, 119 
— July, 143 
— August, 167 
— September, 190 
— October, 215 
— November, 239 
— December, 263 
Opuntia vulgaris, system of treating it in the 
open air, 138 
Opuntia, culture of the genus, 225 
Orchidacese, points to be regarded in potting, 
47 ; their habits usually indicative of the 
treatment they require, 8, 26, 50, 122 ; time 
for beginning to shade them, 96 ; transference 
of the blooming specimens to a cool shaded 
place desirable, 119, 168 ; heat and moisture 
essential to them in the summer, 120 ; period 
for diminishing the supply of heat, water, and 
shade, 168 ; most successful plan for obtaining 
