ROYAL BOTANIC GARDENS, KEW. 
BULLETIN 
OF 
MISCELLANEOUS INFORMATION. 
No. 1.] (1911. 
I—CONTRIBUTIONS TO THE FLORA OF SIAM. 
I.—SKETCH OF THE VEGETATION OF CHIENGMAI. 
A. Fi GQ. Kerr. 
Chiengmai, the capital of Northern Siam, lies about 1000 ft. 
above sea-level, approximately in Iat. 18° 50’ N., Long. 99° 0’ E., 
and is situated on the banks of the Meh Ping, which here traverses 
a valley nearly 120 miles long but not more than 20 or 30 miles at 
its broadest, reaching from the Chieng Dao gorge in the north to the 
Meh Ping rapids in the south. This valley, an alluvial plain almost 
wholly under rice cultivation, is bounded on the east by the moun- 
tains of the Meh Ping—Meh Wang watershed, and on the west by 
those of the Salween—Meh Ping watershed. The mountains on the 
west are the higher, among them being Doi Intanon, which reaches 
a height of 8400 it. and is the highest mountain in Siam, and Doi 
Sootep 5500 ft. 
Doi Sootep, with whose vegetation I will chiefly deal, is composed 
of metamorphic rock, overlain in most places by red clay. It stands 
more to the east than the general line of the range, but is not actu- 
ally isolated, and has two peaks, both practically the same height, 
and about a mile apart, the ridge connecting them dropping about 
500 or 600 ft. 
Chiengmai lies somewhat to the north and a good deal to the 
west of the centre of this valley, about two miles from the foot of 
Doi Sootep. 
CLIMATE. 
The year may be divided into three seasons : a hot season lasting 
from the middle of February to the middle of May, a rainy 
season from the middle of May to the end of October, and a cold 
(18391—6a.) Wt, 92—428, 1375. 1/1, D&S, 
