. SAXIFRAGACEAE. 81 
HYDRANGEA. 
(Family Saxifragaceae). 
Small or moderate-sized spar- 
ingly branched soft-wooded shrubs, 
or exceptionally  root-climbers: 
deciduous. Twigs round, moder- 
ate or relatively coarse; pith 
rather large, roundish, con- 
tinuous, pale. Buds moderate, 
solitary, sessile or very short- 
stalked, globose-conical to oblong, 
with some 4 to 6 exposed scales. 
Leaf-scars opposite, cresent-shaped 
or 3- or 5-angled, rather large, 
little raised, frequently in whorls 
of 3, or with connecting cross-line: 
bundle-traces 3 or exceptionally 5 
or 7: stipule-scars lacking. 
In the main, the winter distinc- 
tions between different hydran- 
geas are fairly clean-cut. 
The following references may be 
given: H. involucrata. Schnei- 
der, f. 206.—H. opuloides. Shirasawa, 276, pl. 11.—H. panicu- 
lata. Schneider, f. 207; Shirasawa, 280, pl 11.—H. petiolaris. 
Schneider, f. 206.—H. petiolaris cordifolia. Shirasawa, 282, 
pl. 12.—H. quercifolia. Schneider, f. 206—H. Thunbergii. 
Shirasawa, 276. 
1. Climbing. ‘ (1). H. petiolaris. 
Bushy. 2. 
2. Red-tomentose: bark extremely flaking. H. quercifolia. 
Glabrate. 3. 
3. Buds round-conical, horizontal. (2). H. paniculata. 
Buds oblong. 4. 
4. Buds spreading: hardy. (3). H. arborescens. 
Buds appressed: tender. (Hortensia). H. opuloides. 
