RUTACEAE. 165 
PHELLODENDRON. Cork Tree. 
(Family Rutaceae). 
Small trees with spongy soft 
bark: deciduous. Twigs moderate, 
rounded: pith moderate, brown, 
continuous: bark yellow when cut. 
Buds solitary, sessile, half-ellip- 
soid, compressed from the sides, 
silky with red or bronzed hairs 
so as to mask the overlapping of 
the 2 scales. Leaf-scars opposite 
or the pairs separated, horseshoe- 
shaped, raised, rather large: bun- 
dle-traces 3, often compound. 
Winter-characters of Phelloden- 
dron ammurense are pictured by 
Schneider, f. 97; and Shirasawa, 
272, pl. .10. 
Phellodendron and Evodia dif- 
fer from the other Rutaceae here 
considered in having their leaf- 
scars opposite or in broken decus- 
sating pairs, and not alternate 
on the stems. Winter twigs of Ptelea, which might be mis- 
taken for those of the cork tree, are easily distinguished by 
this character. 
Though in some respects well suited to cultivation, the 
cork trees possess the great demerit of holding their black 
berry-like fruits late into the season so that, like the black 
cherry in summer, they become an unusual nuisance until the 
last fruit has fallen. 
1. Twigs orange: bark of trunk corky. P. amurense. 
Twigs red or purple-brown: bark of trunk not corky. 2. 
2. Twigs glabrous. (1). P. sachalinense. 
Twigs somewhat hairy above. P. chinense. 
