128 Convolvulus (Convolvulacece). [No. 18 



Leaves, simple, alternate, entire or lobed ; or, in Hedge 

 Bindweed (No. 2), sometimes slightly toothed at the 

 base ; and, in Dodder (No. 4), lacking, or replaced by- 

 scales. 



Fruit, rounded, two- to four-celled ; or, in Convolvulus 

 (No. 2), sometimes one-celled by absorption. Seeds, 

 two to six. A capsule. 



Twining or prostrate herbaceous vines, Many species 

 of the family have been introduced and cultivated for or- 

 nament (e. g., the Moon-floor), some for use (e.g., the 

 Sweet Potato). 



GUIDE TO THE GENERA. 



(a) Leafy. 



(b) Style, undivided. Stigmas, 1 to 3, blunt to 

 globular. Leaves, heart-shape or lobed. (1) 

 Ipomcea (Morning-Glory, etc.) 

 (6) Style, undivided, or two-cleft at the summit. 

 Stigmas, two, line-like to egg-shape. Leaves, 

 arrow-shape. (2) Convolvulus (Bindweeds). 

 (b) Style, two-cleft. Stigmas, two, blunt. Leaves, 

 narrow, tapering to the base. (3) Breweria 

 (Breweria). 

 (a) Leafless, parasitic, never green. (4) Cuscuta 

 (Dodder) 



(1) Genus Ipomcea, L. 



Flowers, from salver-form or funnel-form to nearly bell- 

 form ; one to five blossoms for each cluster-stem. 

 Corolla, with its edges lightly lobed or entire. Calyx, 

 with the outer sepals usually the largest. Bract, 

 absent ; neither on the flower-stem nor covering the 

 calyx. Style, one, undivided. Stigmas, one to three, 

 short and blunt to globular. 



