REMARKABLE TIBETAN PLANTS. E 
what specimens we possess of Guatemalan Oaks. But we are deficient 
in all sort of information, concerning the conditions in which they 
were found. We may nevertheless conclude from their agreement with 
the Mexican Oaks, to some similarity with the localities of the Oaks in - 
its Southern States. Thus Q. tomentosa, callosa, Skinneri, and tenui- | 
Jolia are common to both; while Q. brachystachys, undulata, and con- 
spersa are peculiar to Guatemala. The Oaks are very much on the 
decrease in Nicaragua and Costa Rica; according to Oersted, they are 
found only on the volcanoes, between 7000 and 10,500 feet elevation ; 
and the few species which have been M thence to uoo are 
characteristic *. 
In South America the Oak is wanting in the littoral chain of 
zuela, and the high isolated mountain-chain of St. Martha. B 1 
appears again in the Cordilleras of New Granada, in three species dis- 
covered by Humboldt and Bonpland. These southernmost Oaks of 2 
America are Q. Tolimensis, found at an elevation of 6000 feet in 4? 27^ - 
N., Q. Almaguerensis, and lastly Q. Humboldtii, a fine tree with glo- 
bular fruit, found in 1? 54' N., at the height of 6600 feet. | 
Descriptions of some remarkable TrpEgTAN Prants; dy Tnowas Tuo 
son, M.D., F.L.S., Assistant Surgeon of the Bengal Army. _ 
(Tas. IX.-XII. of Vol. IV.) 
1. CoryDALIs. 
Caule esquamato simplici v. ramoso glabro, foliis glaucis glabris 
sectis crassissimo-carnosis segmentis subrotundo-cuneatis 3—5-loba- 
tis, lobis inciso-crenatis omnibus apice rotundatis, bracteis eec 
inferioribus incisis. (Tab. IX.) 
Corydalis crassissima, Camb. in Jacg. Voy. t. 11. 
Rhizoma subterraneum, elongatum, horizontale, ex apice caulem annu 
erectum 3-6-uncialem sæpius l-foliatum proferens. Folia radicali 
longe petiolata, tripartita, segmentis fere orbicularibus late obcunea- 
tis trilobis vel obtuse tridentatis, rarius pininetipartita, pinnis latera- 
* While reading the last proof, I recived from he large Royal Herbarium. 
Berlin a rich collection of American Oaks, and them a number of s 
from Guatemale sad Oil AMA. CM des s Prussian Puget 
VOL. V. 
