SAXIFBAGACEAE. 



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, pi. 11. H. panicu- 

 lata. Schneider, f. 207; Shirasawa, 280, pi 11. H. petiolaris. 

 Schneider, f. 206. H. petiolaris cordifolia. Shirasawa, 282, 

 pi. 12. H. querci-folia. Schneider, f. 206. H. TUunbergii. 

 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. 



