SAXIFRAGACEAE 49 



1. Climbing by roots. (Climbing hydrangea), H. petiolaris. 

 Not climbing. 2. 



2. Leaves lobed. (Oak-leaved hydrangea). H. quercifolia. 

 Leaves not lobed. 3. 



3. Flower-clusters pyramidal. (Asiatic). 4. 

 Flower-clusters broad. (Native). 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. 7. 

 Leaves pale-pubescent beneath. 8. 



7. With many fertile flowers. H. arborescens. 

 Most flowers sterile. H. arborescens sterilis. 



8. 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 sev 

 eral indistinct scales; small sessile entire leaves; moderately 

 small perfect polypetalous white flowers terminating the 

 branchlets; and half-inferior pointed ovoid many-seeded cap- 

 sules dehiscing part-way from the top. 

 Leaves ovate to oblong, rough, often 3-nerved. F. rupicola. 



JAMESIA. 



Deciduous shrubs with flaking bark; rather slender 

 roundish twigs; rather large rounded continuous brownish 

 pith; opposite low narrow U-shaped leaf-scars with 3 bundle- 

 traces; no stipule-scars; simple rather small leaves with their 

 dilated petioles meeting around the stem; perfect polypetalous 

 moderately small white flowers in small terminal clusters; 

 and ovoid beaked small-seeded inferior capsules. 

 Leaves ovate, serrate, woolly beneath. J. americana. 



