214 



BOTANY. 



related Ipomoeas of the gardens. The curious dodder (Cuscuta), 

 whose leafless, yellow stems are sometimes very conspicuous, 

 twining over various plants, is a member of this family which 

 has lost its chlorophyll through parasitic habits. The sweet 

 potato (Batatas) is also a member of the morning-glory family. 

 The numerous species, wild and cultivated, of phlox (Fig. 118, 



FIG. 119. Anisocarpous sympetalx (Tubiflorse). A, inflorescence of hound's- 

 tongue, Cynoylossum (Borrayinese) , x %. B, section of a flower, x 2. C, 

 nearly ripe fruit, x 1. /), flowering branch of nightshade, Solanum 

 (Solancse), x V 2 . E, a single flower, x i. F, section of the flower, x 2. G, 

 young fruit, x 1. H, flower of Petunia (Solanex) , x %. I, diagram of the 

 flower. 



A), and the blue valerian (Polemonium) (Fig. 118, D), are 

 examples of the family Polemoniacece. 



The third family (Hydrophyllacece) includes several species 

 of water-leaf (Hydropliyllum) (Fig. 118, E) and Phacelia, among 

 our wild flowers, and species of Nemophila, Whitlavia and 

 others from the western states, but now common in gardens, 



