392 



LXXVII. SAXIFRAGES. 



SUB-OEDEE IV. HYDRANGEA, D.C. 



Hydrangea. 

 Seed cut 

 vertically (mag.) 



Hydrangea. 



Tetaloid calyx of the sterile 

 flower (mag.). 



Hydrangea. 



Transverse section of ovary 

 (mag.). 



Hydranya arbordcent. 



Shrubs of the northern hemisphere. Leaves oppo- 

 site, simple, exstipulate. Fruit a capsule, very rarely 

 fleshy. Flowers in a corymb, the outer usually enlarged 

 and sterile. Petals 5. Stamens 10. Ovary inferior or 

 semi-inferior ; styles 2-5. Fruit opening at the top. 



PRINCIPAL GENUS. 

 * Hydrangea. 



SUB-OEDEE V. ESCALLONIE^J, D.C. 



Shrubs or trees. Leaves alternate, exstipulate. Petals 6-6. Stamens 5-6. 

 Ovary free or inferior ; styles 2. Fruit opening at the base. 



PRINCIPAL GENERA. 

 'Escallonia. *Itea. 



[The following is the most recent elaboration of the great family of Saxifragece, 

 as undertaken for the ' Genera Plantarum ' : 



TRIBE I. SAXIFRAGE m. Herbs, usually scapigercras. Leaves usually alternate, exstipulate. 

 Flowers usually 5-merous. Ovary 1-3-celled. Donatia, Astilbe, Saxifraga, Valilia, Tiarella 

 Hetichera, Chrysosplenium, Parnassia, 1 &c. 



TRIBE II. FRANCOEJE. (See order FRANCOACE.E, p. 401). Scapigerous herbs. Flowers 4- 



1 See order Parnassica>, p. 402. 



