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958 ARBORETUM AND. FRUTICETUM. PARTY III. 

Eudésmia tetragina R. Br. (Swt. Fl. Austr., t. 21. , 
and our fig. 686.) is a native of New Holland, at 
Lucky Bay, where it forms a tree growing to the 
height of 20 ft., and producing its white flowers in 
July. It was introduced in 1824. 

Sect. 1]. Eurerrospe’rmMe®. Stamens free. Fruit dry. 
The genus Eucalyptus is a very remarkable one. The name is derived 
from eu, well, and kalypto, to cover as with a lid; in reference to the limb 
of the calyx covering the flower before expansion, and afterwards falling 
off in one piece, in the shape of a lid or cover. The calyx is cup-shaped. 
Petals wanting. Stamens numerous and free. Capsule 4-celled, and many- 
seeded. The leaves quite entire, and coriaceous. Peduncles axillary, and 
bearing an umbel of 3—15 flowers, which are white. The genus con- 
sists of above 100 species, or varieties, all timber trees, growing to 
a great height, and natives of New Holland and Van Diemen’s Land. 
Those belonging to the latter country appear to be decidedly half- 
hardy in the neighbourhood of London: some of them, as E. robista 
and E. pulverulénta, are almost quite hardy; and, in the south of England, 
probably most of the species, if planted so as to form one entire wood, would 
protect one another; and, if they did not attain the size of timber trees, 
would, at least, form a dense Australian copse. The chief reason why 
these trees do not appear hardier in England is, that our summers are not 
sufficiently hot thoroughly to ripen their wood; for it appears that, in the 
mountains of Van Diemen’s Land, they are subject to be frequently covered 
with snow. In Italy, as we have seen in p. 168., several of the species of this 
genus have attained the height of 100 ft. in a very few years; and in their 
native country, as it appears from the information communicated in p. 186., 
the height of 200 ft.is by no means unknown. We have had a number of por- 
traits of full-grown trees of this and other genera made for us in the neigh- 
bourhood of Sydney, by our friend Mr, Thompson, an eminent artist, resident 
there; and engravings from some of these drawings will be found under their 
respective species. The wood of this genus is very durable. Dr. Laing states 
that a stump of the blue gum tree (E. piperita) remained in the ground, quite 
sound, for 35 years after the tree had been cut down. (Hist. and Stat., &c.) 
The terms red, blue, and white gum trees, as applied to different species of 
this genus, have reference to the colour of the bark. The bark contains a 
great proportion of tannin, and is said to be twice as powerful in its opera- 
tion as that obtained from the oak. 
Eucalgptus resinifera Smith (Bot. Rep., t. 400. ; and our figs. 688, 689. 691: fig. 688. represents the 
different parts of the flower, and fig. 691 is the portrait of a tree 200ft. high), the Iron Bark Tree, is a 
native of New Holland, where it produces a resin,which, for all medical purposes, is considered equal 
to kino. It was introduced into Britain in 1788, and flowers from April to July. In its native coun. 
try, it is from 150 ft. to 200ft. high. A tree at Saxmundham in Suffolk, sown by the widow of Sir 
J. E. Smith, is upwards of 20 ft. high, with two stems, each‘of which is as thick as a man’s leg. About 
London, it requires very little protection, when planted against a wall. 
