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 



i 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 1 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 



