Chromosome Ends in Datura Discolor

Abstract

This species is added to the group of Daturas in which the chromosomes of testerraces which represent different species have been compared with those of the standard Line 1 of D. stramonium D. discolor, used as the c? parent, can be crossed to all members of the Stramonium section. Crosses were made to 7 prime types of D. stramonium and to D. ferox and D. quercifolia. Seven chromosomes of D. discolor are the same as 7 of Line 1 in D. stramonium. Five are modified, 2 having the same ends as 2 modified chromosomes of D. ferox and D. quercifolia. Because of difference in size, one of these probably was produced by different interchanges in the different species.