148 ALERSE OF CHILI. 
the Bay of Valdivia," but which, being barren, he had not. 
thought worth distributing with his: Valdivian collections. 
He has kept his promise, and I find the species to be identi- 
cal with that gathered by Captain King, who, indeed, as 
above stated, speaks of it as a native of the Straits of 
Magelhaen as well as of South Chili. 'This, which I can 
no where find described by any author, I now proceed to 
define under the name of 
Tuusa TETRAGONA; 
Excelsa ramosissima, ramulis brevibus erectis subfascicula- 
tis distichis, foliis dense imbricatis exacte quadrifariis unifor- 
mibus ovatis obtusis carinatis concavis sub-cymbiformibus, . 
fructu terminali erecto ovato quadrivalvi, valvis inaequalibus, 
2 exterioribus triplo minoribus, omnibus spina infra apicem 
ovata valvam superante. (Tas. IV.) 
Has. South Chili on the mainland, and in the Straits of 
Magelhaen, probably only on the north side. Captains King 
and Fitzroy. Mr. Darwin. Mountains near the Bay of 
Valdivia: also abundant on the mainland in front of the 
islands of the Archipelago of Chili. Mr. Bridges. 
This is spoken of as a lofty tree, some particulars of the 
dimensions of which are given above. In the older cylin- 
drical branches, where the diameter is about as thick or 
thicker than a goose-quill, there are no leaves, but occasion- 
ally scars whence they have fallen, and loose, thin, brown 
bark, which easily separates from the wood in flakes. On these 
thicker portions of older branches, leafy only towards the — 
extremities, are set, in a very irregular and crowded manner, 
numerous short fasciculated branches or branchlets, leafy to — E 
the base, pinnated with distichous, moderately spreading, 
alternate, simple, or divided branchlets, which are densely 
clothed with imbricated leaves, regularly quadrifarious, SO 
that the branchlets, taken in conjunction with the leaves, are 
regularly tetragonous, with the angles acute. These leaves 
are small, scarcely 2 lines long, ovate, moderately spreading, — 
close (rarely, in some specimens, lax), ovate, rather obtuse; 
carinated on the back, especially towards the point, within 
