VARIOUS PLANT CmOUPS 379 



(Fig. 147, page 148), mountain laurel (Fig. 189, page 202), 

 and sheep laurel (Fig. 190, page 202) . 



Formulas of Gaultheria, Kalmia, and Ericaceae are given on 

 pages 416, 417. 



A corolla with the petals coalesced, as in the examples 

 here given, is termed gmnopetalous,^ a corolla with distinct 

 petals being choripetalous.- 



When anthers open by pores the dehiscence is said to be 

 poricidal as in the case of capsules which open similarly. 



It will be noticed that the capsule of mountain laurel 

 (Kalmia) dehisces by splitting through the partitions. Such 

 dehiscence is distinguished as sepiicidal.'' 



The fruit of wintergreen (Gaultheria) is peculiar in having 

 a loculicidal capsule enveloped in a fleshj' enlargement of the 

 calyx and torus. 



The typical members of the family are woody plants, often 

 aromatic; having simple, exstipulate leaves; and perfect, gamo- 

 petalous flowers, ivith poricidal stamens, and a compound pistil, 

 superior or inferior ovary and axile placenta:; the fruit being 

 capsular, or berry-like. 



131. The heath order fEricales) includes several families 

 associated with the above through having mostly regular and 

 perfect, usually gamopetalous flowers, four to ten stamens 

 nearly or quite free, the anthers mostly poricidal, and the ovary 

 compound, with axile placenta;. 



The formula for Ericales is given on pages 416, 417. 



132. The morning-glory family (Convolvulaceae) is well 

 exemplified by the sweet potato (Figs. 56, 57, pages 58, 



59). 



Formulas of Ipomoea and Convolvulaceae are given on pages 416, 

 417. 



The new features to be noted here are the estivation of 



I Gam"o-pet'al-ous < Gr. gainos, union; petalon, flower-leaf. P). 

 = Cho"ri-pet'al-ous < Gr. choris, separate. 



'' Sep'ti-ci"dal < L. septum, partition; cwdire, cut. Indicated by the 

 sign^. 



