PN-6369 



Figure 3.— Leaf of D. pentaphyUa (natural seed). 



occur in large panicles. The female flower racemes are produced singly in 

 the axils of the leaf. If the tubers are yellow fleshed, the flowers are 

 odoriferous. Bulbils are not produced. 



D. dumetorum , a highly varied species, consists of wild poisonous 

 races and cultivated, less poisonous races. The tubers are rather globose 

 in overall shape and are divided into many lobes difficult to peel (fig. 6). 

 They may be produced near the surface or deep in the soil. The flesh 

 is white to yellow. The stem of up to 8 millimeters is heavily prickled 

 and tough. 



The leaves are large, divided into three leaflets. The lateral leaflets 

 are often lobed, especially in the lower part of the plant. All parts are 

 covered with dense pubescence. Bulbils are often present and are spiny. 

 Male racemes are condensed spikes, sometimes in cymes of small flow- 

 ers. The female raceme is open. 



D. numnmlaria, because it belongs to another section, Enan- 

 tiophyllum, is distinct from the other four species. The tubers often 

 descend into the soil, occasionally a full meter, and are sometimes deeply 

 lobed into several large, almost independent tubers. These are long and 



11 



