CONVOLVULACE^E. 



197 



greenhouse, and, from their singularity, are worthy of a 

 place : — A. salicifolia, angustifolia, rosea, Unifolia, Mexi- 

 cana, and linaria are from Mexico and South America ; A. 

 Douglasii, from the Rocky Mountains, is a handsome plant, 

 with long, rather narrow leaves, woolly underneath; the 

 flowers in umbels, much crowded, and of a reddish-purple 

 colour tinged with green; this species is also sufficiently 

 hardy for the border. These plants prefer a light soil of 

 rich loam and leaf-mould, and plenty of room. 



CONVOLVULACEM 



Exogens, with the flowers terminal or axillary, one or many 

 flowers together. Calyx not falling off, in five divisions, often 

 very unequal. Corolla monopetalous, growing below the ovary, 

 regular, and falling off, the limb five-lobed and plaited, the tube 

 without scales. Stamens five, inserted into the base of the 

 corolla, and alternate with its segments. — Herbaceous plants 

 or shrubs, usually twining, abundant in tropical climates, rare 

 in cold countries ; leaves alternate, undivided or lobed, seldom 

 pinna tifid ; their juice medicinal, roots edible. 



IPOMCEA. 



Gen. Char. (Pentandria Monogynia.) Corolla funnel-shaped, 



