GROUP V. ANGIOSPERM^E ; DICOTYLEDOXE.S. 5G7 



places, with rosettes of radical leaves which catch insects by their viscid 

 secretion. 



Cohort III. Polemoniales. Flowers generally regular, but 

 with oligomery in the gynaeceum ; pentamerous : stamens epipetal- 

 ous : ovary of two, rarely five, carpels : leaves usually scattered 

 and exstipulate : the inflorescence is often cymose, with a terminal 

 flower: formula K (5) [C (5) A5] G to (-). 



Order 1. CONVOLVULACE^E. Usually two median carpels 

 forming a bilocular ovary, with 1-2 anatropous ovules in each locu- 

 lus : the corolla has usually a contorted aestivation, twisted to the 

 right: fruit a septifragal capsule, or a berry: seed with endo- 

 sperm. Commonly plants climbing by twining stems : with milky 

 latex. 



Convulvus arvensis, the lesser Bindweed (Fig. 274 A\ 

 and Calyxtegia Sepium, the larger Bindweed, the 

 former with two small bracteoles, the latter with 

 two large bracteoles which invest the calyx, and 

 C. Soldandla. the Sea-Bindweed, are common wild 

 plants. Batatas edulis is cultivated in Tropical 

 America for its edible tuberous rhizome, the Sweet 

 Potato. 



The genus Cuscuta consists of parasites destitute 

 of chorophyll, with filiform twining stems, which 

 attach themselves to other plants by means of 

 haustoria (see p. 48), and derive their nourishment 

 from them : the small flowers are arranged in p- IO- 3^ _ Stem of 

 fascicles (Fig. 381 b) : the corolla has imbricate Cuscuta europcea(g), with 

 aestivation: fruit a capsule with transverse dehis- inflorescence (b) twining 



round a stem of Hop (a), 

 cence. 



C'ascuta europaxi, the greater Dodder, which occurs commonly on Nettles 

 and Hops, is widely distributed : C. Epilinum is the Flax Dodder, and C. 

 Epilhymum, the lesser Dodder, occurs on various low-growing plants; C. 

 Trifolii attacks Clover, which it often destroys. 



Order 2. POLEMONIACE/E. Ovary usualy trimerous and trilo- 

 cular, with one erect or several oblique ovules in each loculus ; 

 capsule loculicidal : seed with endosperm. Mostly herbs. 



Polemonium cceruleum is Jacob's Ladder ; various species of Phlox and 

 Gilia are common garden plants. Cobaea is a genus of plants climbing by 

 means of leaf-tendrils. 



Order 3. SOLANACEJE. Ovary usually consists of two obliquely 

 placed carpels, bilocular, with numerous ovules in each loculus : 

 the axile placentae sometimes project so far into the loculi that 



