CONVOLVULACEAE (CONVOLVULUS FAMILY) 



321 



they are sometimes more than two feet long, and so thick as to 

 attain a weight of over thirty pounds. Several stout, smooth 

 stems spring from the same root, trailing or twining for a length 

 of three to twelve feet. Leaves alternate, deep green, heart- 

 shaped, long pointed, sometimes 

 drawn in at the sides to a fiddle- 

 shape, two to six inches long, 

 with slender petioles often longer 

 than the blades. Flowers like 

 those of the morning glory, the 

 corollas funnel-shaped, two to three 

 inches long, white, with five pink- 

 ish purple stripes, often several 

 on one stalk, which lengthens very 

 much as the seed ripens ; stamens 

 five, inserted low down on the 

 tube of the corolla and alternat- 

 ing with its lobes; ovary two 

 celled, with entire or two-lobed 

 stigma. Capsules globular, two- 

 celled, containing two to four 

 seeds, which have fine wool all 

 around the margins. (Fig. 223.) 



Means of control 



Except to satisfy hunger it would FIG. 223. - Wild Sweet Potato Vine 



, . f , , , (Ipom-ea pandurata) . X i- 



not pay to dig for these deeply 



buried roots. Repeated deep cutting of the stems, putting a hand- 

 ful of salt or a few spoonfuls of crude carbolic acid on the shorn 

 surfaces, will finally subdue the weed. 



FIELD BINDWEED 

 Convdlvulus arvensis, L. 



Other English names : European Bindweed, Small-flowered Morning- 



Glory, Cow-bind, Bell-bind. 

 Introduced. Perennial. Propagates by seeds and by horizontal 



roots that bud new plants. 



