346 



COLLEGE BOTANY 



This family is represented by tke witch-hazel {Hamamelis vir- 

 giniana) and the sweet gum tree (Liquidambar styraciflua). 



Rosacea. (Rose Faxoily). — Herbs, shrubs and trees; leaves 

 alternate and stipulate ; inflorescence' terminal, usually a corymb, 

 cyme or umbel; flower perfect and regular; sepals five (some- 

 timejS three to five or eight), united at the base ; petals same num- 

 ber as sepals (sometimes absent) ; stamens numerous, inserted 

 with petals on disk of calyx tube ; pistil apocarpous with one to 



FiQ. 183. — Gooseberry. 



many carpels, distinct or united with the calyx tube ; fruit a 

 pome, drupe, follicle or achene; a large family eimtaining many 

 of our most important fruits and some of our best ornamentals. 

 Owing to its diverse character we will divide it into sub-families : 



Sub-Family — Rosece (Roses). — Ovaries enclosed in the 

 calyx tube, pistils of several carpels, each developing into hard, 

 long achenes within the globose or urn-shaped, fleshy calyx-tube. 



This includes the genus Rosa,, which contains our well-known 

 roses that are used so extensively for ornamental purposes. The 

 growing of roses is a very important industry. 



