776 



CONVOLVULACEAE 



Ipomoea 



Miles 



50 



Map 1675 



Ipomoea lacunosa L. 



7003. IPOMOEA L. Morning-glory 



Flowers small, 1-2 cm long, usually about 1.5 cm long, varying in color from white to 



pink and purplish; capsules pubescent; seed glabrous 1. /. lacunosa. 



Flowers large, more than 3 cm long, varying in color from white to purple; capsules 

 glabrous; seeds more or less pubescent. 

 Stems, petioles, and peduncles glabrous. 



Under surface of most of the leaves sparsely pubescent at least on the principal 



nerves 2. I. pandurata. 



Under surface of leaves glabrous 2a. /. pandurata var. rubescens. 



Stems, petioles, and peduncles with long, retrorse hairs. 



Flowers mostly less than 4 cm long; base of calyx tube with more or less rufous 

 hairs; calyx lobes long, attenuate-caudate, with spreading tips; leaves always 



3-lobed 3. I. hederacea. 



Flowers mostly more than 4 cm long; base of calyx with colorless hairs; calyx 

 lobes ovate-oblong to lanceolate, the tips not spreading; leaves never lobed 

 except in the form. 



Leaves entire 4 - L ptirpurea. 



Leaves 3-lobed 4a. I. purpurea forma. 



1. Ipomoea lacunosa L. Map 1675. Infrequent but common enough 

 where it is found. Usually in cultivated fields and in the wild in moist or 

 wet places along- streams. The leaves vary from entire to angled or 3-lobed 

 and the flowers from white to pink, mostly white in our area. 



Pa., 111. to Kans., southw. to S. C. and Tex. 



2. Ipomoea pandurata (L.) G. F. W. Mey. Wild Potato Vine. Map 

 1676. More or less frequent throughout the state although there are no 

 records for the area north of the Kankakee River. It prefers moist soil 

 along streams but is also found on washed slopes and infrequently in dry 

 woodland. 



This species develops a tuber of enormous size at a great depth in 

 the ground. The largest I have seen was about 24 inches long and about 

 5 inches in circumference in the middle. It was elliptic in shape. I was 

 told of one that was of incredible size and I forbear to give dimensions for 

 fear an error was made in identification or measurements. Vines 9 to 15 



