284 



DICO T YLED ONS. 



the leaves of the same season, and hang in one-sided short ra- 

 cemes as shown in fig. 378. The calyx is short, five-lobed, 

 and adheres to the ovary. The corolla 

 is tubular, at length cylindrical with 

 five short lobes, and is whitish in color. 

 The stamens are ten in 

 number, and the com- 

 pound ovary has a sin- 

 gle style. The fruit is 

 a rounded black, edi- 

 ble berry or drupe, 



With ten Seeds. Diagram of Erica. 



(Vines.) 

 541. The family ericacea? 

 contains the trailing arbutus, cassandra, andro- 

 meda, cassiope, etc. The rhododendron family 

 contains the rhododendrons, azaleas, kalmias, 

 etc. These with the pyrola and whortleberry 



families are closely related and make up the order heaths, or Bicornes as they 



are sometimes termed, because the anther frequently 



has two horn-like appendages. 



PRIMULINyE. 



542. The primrose family (primulaceae). — The 



primroses (primula) represent well this family. In fig. 



453 is represented the flower of the primrose grown 



in conservatories. It is gamosepalous and gamopeta- 



lous. There are five stamens, each one inserted on flower. (Vines 



the tube of the corolla and opposite the lobe. (For a description of the flower 



see chapter on pollination, Part III.) The floral formula is CaS,Co5,As,G5. 



Fig. 37S. 

 Whortleberry (Gaylussacia re- 

 sinosaj. 



Fig. 380. 

 Diagram of primula 



Topic IX: Dicotyledons with united petals, flower 

 parts in four whorls. 



TUBIFLORj€. 



543. The morning-glory or bindweed family (convolvulacese). — The 



hedge bindweed (Convolvulvus sepium) occurs in moist soil along streams. 

 The stem is twining as in most of the members of the family. The leaves are 



