OBCHtDACE^, TEEKESTRIAL. 



217 



ORCHIDEOUS EPIPHYTES. 



I a joint and laid on a shelf for tvv-o or j 

 j three days to dry before planting, in [ 

 j order that the superfluous moisture 

 I may escape. When planted they ! 

 I should not be -watered ; and when j 

 I young plants are raised from seed, i 

 they also should not be watered when [ 

 they are transplanted. — SeeCA'cTUS. I 

 Orangery. — A house intended ', 

 only for Orange trees may be opaque 

 at the back, and even the roof, with 

 lights only in front, provided the 

 plants be set out during summer. 

 In fact, so that the plants are pre- 

 served from the frost, they will do 

 with scarcely any light during winter; 

 and in many parts of the Continent 

 they are kept in a cellar. 



Oran'Ge Thorn. — Cltriobatus.— 

 Spinous shi-ubs, belonging to Pitto- 

 sporacese, natives of Port Jackson 

 and other parts of Australia, which, 

 from bearing small orange -coloured 

 fruit, are called Orange Thorn by 

 the colonists. 



Orange Tree. — See Ci'trus. 



Orchida^ce^, terrestrial. — 



The terrestrial Orchidiicese are, as 



j their names import, those plants 



: belonging to this extensive order 



j which grow in the ground, in contra- 



! distinction to the Epiphytes, or those 



1 -which grow with their roots exposed 



j to the air. The terrestrial Orchi- 



j dece are of four kinds, viz. those 



I fi"om the tropics, which require a 



j stove in England ; those from the 



i Cape of Good Hope, which require 



j a greenhouse ; those from the South 



j of Europe, which only need a slight 



protection during winter ; and the 



hardy kinds, most of which are 



natives of Great Britain. The stove 



species requii-e nearly the same 



treatment as the Epiphytes (see 



Orchideous Epiphytes); and the 



greenhouse species only differ from 



other greenhouse plants in requiring 



particular care to be paid to their 



drainage. For this purpose the pots 



should be filled one quarter of their 

 depth with broken potsherds or cin- 

 ders, and the soil should consist of 

 turfy peat broken into pieces, and 

 sand mixed with about a third of 

 vegetable mould. The half-hardy 

 and hardy kinds may be grown 

 either in pots or in the open ground. 

 — See O'rchis. 



Orchideocs Epiphytes. — The 

 plants thus designated should, pro- 

 perly speaking, only be those which, 

 in their native countries are found 

 hanging from the bi'anches of trees, 

 with their roots exposed to the air, 

 as these only can be called air-plants. 

 It is, however, very difficult to draw 

 a line of demarcation, as regards 

 culture, between these plants and 

 the terrestrial Orchidefe of the tro- 

 pins, as several ofthe Epiphytes may 

 be grown to great perfection in pots; 

 and others, though in a state of cul- 

 tivation, they can only be grown well 

 on branches of trees, are found grow- 

 ing naturally on exposed rocks. All 

 the true Epiphytes, which in their 

 wild state are found with their roots 

 hanging down in the air, grow in 

 dense forests, where shade, moisture, 

 and excessive heat, seem essential 

 to their existence ; and these plants 

 in a state of culture should generaUy 

 be grown in baskets, either of earthen- 

 ware or china, or in husks of Cocoa- j 

 nuts half filled with moss, or tied 

 on pieces of wood, hung up from the 

 rafters of a damp stove, and in the 

 shade. This rule, however, though, 

 apparently so reasonable, is not with- 

 out its exceptions in practice ; pro- 

 bably because, as it is impossible to 

 imitate the natural climate of the 

 plants exactly, their wants are 

 changed by the difterent situation in 

 which they are placed. Thus, the 

 West Indian Dendrobiums and Epi- 

 dendrums, both of which in their 

 natural state are generally found on 

 the branches of trees, in a state of 



