The Genus Collinsia. V. Genetic Studies in C. heterophylla

Forty-eight loci were identified in Collinsia heterophylla Buist (n = 7). 2. The phenotypes were arbitrarily divided into six groups: five groups are based on the organ or organs affected, and a sixth group includes genes affecting growth and developmental characters. 3. The type of division and the number of divided leaves were controlled by two closely linked genes of which one has two dominant allels. 4. The intensity of the color of the upper and lower lips of the flower was influenced by genic interactions. 5. Two linkage groups were established with eight genes in group I and nine genes in group III. Two genes had already been placed in group II by Hiorth.