. Bursa bursa-pastoris and Bursa heegeri biotypes and hybrids. Bursa heegeri; Plant hybridization. 18 BURSA BURSA-PASTORIS AND BURSA HEEGERI : of my cultures. Few showed even a suggestion of the squarish lobes which were so conspicuous in the parent, thus indicating that the strong development of that characteristic in the parent was in all probability merely a fluctuation. These plants differed from those considered typical of B. bp. heteris in having the primary lobes of the climax-leaves oblong and blunt, not attenuate. However, in some specimens the later leaves showed the attenuate lobes
. Bursa bursa-pastoris and Bursa heegeri biotypes and hybrids. Bursa heegeri; Plant hybridization. 18 BURSA BURSA-PASTORIS AND BURSA HEEGERI : of my cultures. Few showed even a suggestion of the squarish lobes which were so conspicuous in the parent, thus indicating that the strong development of that characteristic in the parent was in all probability merely a fluctuation. These plants differed from those considered typical of B. bp. heteris in having the primary lobes of the climax-leaves oblong and blunt, not attenuate. However, in some specimens the later leaves showed the attenuate lobes of typical B. bp. heteris, and this fact leaves little doubt that another generation would have completely demonstrated that this family belongs to B. bp. heteris. Whether a culture (0645) produced from seeds sent by Dr. D. T. Mac- Dougal, from Tucson, Arizona, is likewise identical with the B. bp. heteris grown from seeds collected in Illinois, Ohio, and Long Island, has not been sufficiently tested. While the Tucson plants had in a most strongly marked way the primary and secondary lobes described above, there were striking differences in the texture and color of the leaves, the form of the lobes, and the form, size, and texture of the stem-leaves or bracts (fig. 8). As only one generation of plants has been grown from these seeds, no proper grounds exist for attempting to decide as to the permanence of the differences exhibited, but it might be expected that plants from the hot, dry, intensely lighted plains of Arizona would display considerable changes of a purely transitory nature on being transferred to the moist atmosphere and relatively dim light ^, „ „ , , . of a more northern propagating-house. Pig. 1.—Bursa bursa-pastorts ,,, . \. ° heteris. Climax leaves of a Field observation indicates that the type of specimen growing near Cold rosette possessed by Bursa at Tucson, of which Spring Harbor, Long Island. ,, . ,, . , . , this culture was a fair example, is t
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