SAXIFRAGACEAE 209 



HYDRANGEA. Bark peeling; branchlets bright brown, pithy. Ls. opposite, 

 toothed, prominently veined. Fls. usually in flattish or rounded terminal branched 

 clusters, outer fls. usually sterile and much larger than those in the centre. Fruit 

 dry, 2-5-celled, splitting at top. 



(a) Fls. in pyramidal panicles 



H.paniculata. 15. August-September. D. Ls. often in threes, ov., 6, 

 toothed, with scattered hairs. Outer fls. white changing to purple-pink, 

 inner fls. yellowish white. Japan. (Fig. 55 b.) 



H. quercifolia. Grey Beard. 3. July. D. Young stems woolly. Ls. ov. or 

 circular, 4, 5-7-lobed, minutely toothed, downy below. Outer fls. i^, 

 white changing to purple. South United States. (Fig. 34 K.) 



{h) Fls. in flattish or rounded branched clusters 



H. arborescens, variety grandiflora. 4. July-August. D. Ls. ov., or circular, 

 6, short-pointed, coarsely toothed, hairless except on veins or in vein- 

 axils. Fl.-clusters flattish; aU fls. sterile, large, white. East United 

 States. 



H. Bretschneideri. 10. July. D. Ls. ov., 5, long-pointed, evenly toothed. 

 Fl.-clusters flattish; outer fls. white, changing to pink, inner fls. dull 

 white. China. (Fig. 58 f.) 



H. Davidii. 6. July. D. Young stems slender, downy. Ls. lane, 6, tapered 

 at both ends; apex long, slender and curved; coarsely toothed. Outer 

 fls. white, inner pale blue; clusters stalkless. China. (Fig. 58 B.) 



* H. hortensis {H. opuloides). S. July -September. D. Ls. ov., 6, coarsely 

 toothed, pale bright green, hairless or nearly so. Outer fls. pink or blue. 

 China and Japan. (Fig. 58 a.) 



(Most garden Hydrangeas— in which the fls. are all sterile— are derived 



from this.) 



Variety Mariesii. Outer fls. mauve-pink, inner pinkish white. 



Variety nigra {H. cyanoclada). Stems dark purple. Fls. mostly sterile, 



rose-coloured. 



H. involucrata. i\. August-October. D. Stems and Is. downy. Ls. ov., 3, 

 rough above, teeth bristle-like. Outer fls. white or blue-white, inner blue. 

 Japan. (Fig. 58 G.) 



H. petiolaris. Climber. July-August. D. Aerial roots. Ls. ov., 3, sharply 

 and evenly toothed, nearly hairless, long-stalked. Fls. white. Japan. 

 (Fig. 58 c.) 



H. radiata. 5. July-August. D. Ls. ov., 6, dark green above, white-felted 

 below. Fls. white. South-east United States. 



H. Sargentiana. 6. July-August. D. Stems very bristly. Ls. ov., 10, net- 

 veined, bristly. Outer fls. pinkish white, inner rosy lilac. China. 

 (Fig. 58 E.) 



H. villosa. 9. July-August. D. Stems angular, hairy. Ls. lane, 9, dull 

 green and bristly above, grey down below. Outer fls. blue or white, with 

 four toothed petals (bracts); inner fls. white. China. (Fig. 58 d.) 



ITEA. Branchlets with chambered pith. Ls. alternate, toothed, short-stalked. 

 Fls. smafl, in long narrow spikes, K (5), C5, A5, G (2). Fruit ^, dry, 2-grooved. 

 /. ilicifolia. 18. August. E. Ls. broadly ov., 4, spiny-toothed, glossy above, 



