392 



LXXVII. SAXIFEAGE-S. 



SuB-OEBEE IV. HYDRANGEA, B.C. 



Hydrangea, 

 Flower-bud (mag.)- 



<?^^- 



(0^ 





Hydrangea, 

 Diagram. 



Hydrangea. 

 Seed cut 

 vertically (mag.). 



Hydrangea. 



Petaloid oalyx of the sterile 



flower (mag.). 



Hydrangea, 

 Transverse section of ovary 

 (mag.). 



Hydrangea arhorescms. 



Shrubs of the northern hemisphere. Leaves oppo- 

 site, simple, exstipulate. Frnit 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. 

 *PIydrai]g'ea. 



SuB-ORDBE V. ESGALLONIE^, D.O. 



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

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



PEINCIPAL GENEEA. 

 *Escallonia. *Itea. 



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

 as undertaken for the ' Genera Plantarum ' :— 



Tribe I. Saxifeage^.— Herbs, tisiaally scapigerous. Leaves nsnally alternate, exstipnlate. 

 Flowers usually 5-merous. Ovary 1-3-celled. Donatia, Astilhe, Saxifraga, Vahlia, Tiarella, 

 Heuchera, Ghrysosplenium, Parnassia,^ &c. 



Tkibb II. Fkanooe^. (See order Feanooace^, p. 401). — Scapigerous herbs. Flowera 4- 



1 PJfio n>>fli:.ii T^nvn.nes-i/'^ ii d.(\0. 



