i65 



during the summer of 1923. They all made vigorous growth 

 (see Plate 292), producing a tangled mass of vines but there was 

 no formation of flower buds. These seedlings differed greatly 



Figure 3. A pot-grown plant, from a cutting of a seedling sweet potato, 

 blooming during January, 1924, in a greenhouse at The New York Botanical 

 Garden. Fruit failed to start development, although careful pollinations 

 were made by hand for all of the flowers. 



in respect to shape of leaves, habits of growth and the color 

 and size of fleshy roots. 



In the autumn of 1923 cuttings were made from the ten clones 

 and a total of 151 plants were grown in pots in a greenhouse 

 during the following winter. All grew well, some making vines 

 four feet in length. The 23 plants of the clone that bloomed 



