ROSACEAE. 97 
SORBARIA. 
(Family Rosaceae). 
Low and little-branched shrubs: 
deciduous. Twigs terete, some- 
what zig-zag, stout for the size of 
the plant, glabrous: pith rela- 
tively large, rounded, brown, con- 
tinuous. Buds ovoid, moderate 
and sessile, with about 4 exposed 
scales, or quickly developing so as 
to become large, open, stalked and 
collaterally multiple, the end-bud 
lacking. Leaf-scars alternate, 
rather large, half-round to round 
or elliptical, more or less angled 
or truncate, little raised: bundle- 
traces 3, large: stipule-scars lack- 
ing. 
Sorbaria has been considered a 
part of the genus Spiraea by many 
botanists, and on the other hand 
those who segregate it sometimes 
use the generic name Basilima for 
its species. The following winter-character references may 
be given:—S. alpina. Schneider, f. 133——S. sorbifolia. Bose- 
mann, 76; Schneider, f. 133. The reason why no terminal 
bud is found in Sorbaria, and the structure of its buds, are 
considered in an extensive article on buds published by Ohlert 
in the journal Linnaea for 1837. 
1. Twigs and buds red-brown. (1). S. Lindleyana. 
Twigs and buds gray-brown. 2. 
Twigs purple: capsules glabrous. S. Aitchisoni. 
2. Capsules glabrous. (2). S. sorbifolia. 
Capsules loosely hairy. S. stellipila. 
