357 
all, with the exception of the last, monotypic. The Tetracentron 
ears a considerable resemblance to Cerczdiphyllum japonicum, but 
is roughly distinguished by its invariably alternate leaves. 
It was introduced by Mr. Wilson for Messrs. Veitch about 1901, 
and presented by them to Kew. It is certainly quite hardy. 
The leaves are deciduous, broadly-ovate with a subcordate base, 
4 to 5 inches long, serrate, with five or seven prominent longi- 
tudinal nerves. Flowers small, yellowish, in slender spikes about 
4 inches long. 
native of Central and Western China from 5000 to 9000 
feet. Monotypic. 
By the kind permission of Professor Sargent, Arnold Arboretum, 
Harvard University, photographs of the two last-mentioned plants 
taken by Mr. Wilson in China are reproduced on the accompanying 
plates. 
EXPLANATION OF PLATES. 
1. Tapiscia sinensis, 90 feet x 12 feet, Western Szechuan ; 
altitude 4,100 feet. The largest specimen found. 
2. Tetracentron sinense, 70 feet x 8 feet. Chino - Tibetan 
borderland ; altitude 8,000 feet. 
LI—DECADES KEWENSES. 
Pranrarum Novarum 1n Herpario Hori Reaii 
ConsERVATARUM. 
DECAS LIV. 
531, Xylia Kerrii, Craih et Hutchinson [Leguminosae-Adenan- 
thereae]; aftinis X. dolabriformi, Benth., sed foliis subtus velutinis 
10 cm, longa et 5 cm. lata, 
gineo-tomentosi. Petala oblanceolata, obtusa, 
4 mm. longa, superne 1 mm. lata, extus i Caaaal 
10. Ovarium oblique ellipsoideum, 2 mm. gave tie 
tomentosum ; stylus 5-7 mm, longus, trunca ue, & 3 
