ANNOTATIONS AND ADDITIONS. 329 



the brothers Loddiges in 1848 has been estimated at 2360 species; 

 while in 1843 it was rather more than 1650, and in 1813 only 115. 

 What a rich mine of still unknown superb flowering Orchideae the 

 interior of Africa must contain, if it is well watered ! Lindley, in 

 his fine work, entitled " The Genera and Species of Orchideous 

 Plants," described in 1840 precisely 1980 species; at the end of the 

 year 1848 Klotzsch reckoned 3545 species. 



While in the temperate and cold zones there are only "terrestrial" 

 Orchideae, i. e. growing on and close to the ground, tropical coun- 

 tries possess both forms, i. e. the " terrestrial" and the " parasitic," 

 which grow on trunks of trees. To the first-named of these two 

 divisions belong the tropical genera Neottia, Cranichis, and most of 

 the Habenarias. We have also found both forms growing as alpine 

 plants on the slopes of the chain of the Andes of New Granada and 

 Quito : of the parasitical Orehideae (Epidendreae), Masdevallia uni- 

 flora (at 9600 French, or about 10,230 English feet) ; Cyrtochilum 

 flexuosum (at 9480 French, or about 10,100 English feet) ; and 

 Dendrobium aggregatum (8900 French, or about 9480 English 

 feet) : and of the terrestrial Orchideae, the Altensteinia paleacea, 

 near Lloa Chiquito, at the foot of the Volcano of Pichincha. Claude 

 Gay thinks that the Orchideae said to have been seen growing on 

 trees in the Island of Juan Fernandez, and even in Chiloe, were 

 probably in reality only parasitical Pourretias, which extend at least 

 as far south as 40 S. lat. In New Zealand, we find that the tropi- 

 cal form of Orchideae hanging from trees extends even to 45 S. lat. 

 The Orchideae of Auckland's and Campbell's Islands, however 

 (Chiloglottis, Thelymitra, and Acianthus), grow on the ground in 

 moss. In the animal kingdom, one tropical form at least advances 

 much farther to the south. In Macquarie Island, in lat. 54 39', 

 nearer to the South Pole therefore than Dantsic is to the North 

 Pole, there is a native parrot. (See also the section Orchideae in 

 my work de Distrib. geogr. Plant., pp. 241-247.) 



( 33 ) p. 242." The Camarinese." 



Acacias which have phyllodias instead of leaves, some Myrtaceae 

 (Eucalyptus, Metrosideros, Melaleuca, and Leptospermum), and 

 Casuarinas, give a uniform character to the vegetation of Australia 



28* 



