84 SAXIFRAGACEAE, 
flowers with a single large sepal; and small inferior many- 
seeded capsules. 
Leaves round-ovate, toothed. . S. hydrangeoides. 
HYDRANGEA, 
Deciduous shrubs usually sparingly. or coarsely branched, 
exceptionally climbing by aerial roots, often with shredding 
bark, with nearly terete twigs; relatively large round homogene- 
ous pale pith; low crescent-shaped to half-round or triangular 
leaf-scars, opposite or in whorls of three, with 3 or in some 
cases 5 or 7 bundle-traces in a single series; no stipule-scars ; 
oblong solitary subsessile buds usually with several pairs of 
scales; rather large simple toothed or lobed stalked leaves; 
small perfect polypetalous flowers in compound terminal clusters, . 
often surrounded by showy sterile ones; and small inferior 
capsules. 
1. Climbing by roots. H. petiolaris. 
Not climbing. 2. 
2. Leaves lobed. H. quercifolia. 
Leaves not lobed. 3. 
3. Flower-clusters pyramidal. 4. 
Flower-clusters broad. 6. 
4. With many fertile small flowers. 5. 
Most flowers large and sterile. H. paniculata grandiflora. 
5. Flowering in late summer, H. paniculata. 
Flowering in early summer. H. paniculata praecox. 
6. Leaves glabrous beneath. H. arborescens. 
Leaves pale-pubescent beneath. 7. 
7, Leaves thin, grayish beneath. H. cinerea. 
Leaves firm, white beneath. H. radiata. 
FENDLERA, 
Deciduous shrubs with slender often short fluted twigs; 
somewhat angled pale homogeneous pith; opposite raised cre- 
nately U-shaped leaf-scars, connected by transverse lines, with 
3 bundle traces; no stipule-scars; sessile ovoid buds with several 
indistinct scales; small sessile entire leaves; moderately small 
