. Bursa bursa-pastoris and Bursa heegeri biotypes and hybrids. Bursa bursa-pastoris; Bursa heegeri; Plant hybridization. 26 BURSA BURSA-PASTORIS AND BURSA HEEGERI: Two original cultures of B. bp. simplex were grown from seeds col- lected at Edg-ewood, New Carlisle, Ohio, by J. Marion Shull, June 2 to 17, 1905. In the parents of both these cultures ( and ) the lobes were undivided and not elong-ated, thougfh they were somewhat triang-ular- acutish. One of these () had a more tapering- apex than the other and its lateral lobes were more divaricate and more acute, but their progf-
. Bursa bursa-pastoris and Bursa heegeri biotypes and hybrids. Bursa bursa-pastoris; Bursa heegeri; Plant hybridization. 26 BURSA BURSA-PASTORIS AND BURSA HEEGERI: Two original cultures of B. bp. simplex were grown from seeds col- lected at Edg-ewood, New Carlisle, Ohio, by J. Marion Shull, June 2 to 17, 1905. In the parents of both these cultures ( and ) the lobes were undivided and not elong-ated, thougfh they were somewhat triang-ular- acutish. One of these () had a more tapering- apex than the other and its lateral lobes were more divaricate and more acute, but their progf- enies were g-enerally indistingaiishable from each other. Only one speci- men among-the offspring- of had the long-, tapering- apex of the parent, this fact apparently showing- the difference between the two parents in this regfard to be a simple fluctuation. These two lots of seed were sown June 26, 1905. The first () produced 170 plants which, except for some slight fluctuations, were evi- dently of a single type. A second generation of 44 plants raised from the seeds of an average specimen () kept strictly to the same type. The other original culture (056) consisted of 425 specimens, all but 5 of which were typical B. bp. simplex. The 5 aberrant specimens belonged to B. bp. rhom- boidea (fig. 20), whose presence in this family was assumed to be due to chance crosses in nature. This assumption was tested by rear- ing a family from seeds of one of these (). Its hybrid character was fully demonstrated, and the results are given in Fig. \ bursa-pastoris detail in the section devoted to hvbrids (p. 42). rhomboidea. Climax-leaves of _ ^ . , " ^ , a plant growing in a dooryard ^ome fluctuation was observed among the near Cold Spring Harbor, Long specimens of B. bp. simplex. A very few Island. somewhat stunted specimens had the leaves smaller than normal, somewhat shining, and with the lobes more crowded. One of these () was tested. Fully
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