GENETIC STUDIES IN POLEMONIUM COERLLELM 19 



would ))(' possible fo distiiif^'iiisli Ix'tween several types which dilfer 

 ill tlic luiinher and sliapc of I lie folioles of the leaves. Other varia- 

 tions are found with re^'ard to Iiairiness etc., but hitherto I have 



Fig. 1. Polemoninm coeruleinn. Leaf of the type (to the right) and of var. sibiricum 



(to tiie left). Nat. size. 



not taken any of these variations into mj^ studies, 

 2. Variations in the floral parts. 



White-flowered forms of P. coeruleum are very common in 

 cultivation. As true albinos they show absence of anthocyan not 

 only in the corolla, but in all other parts of the plant. 



