. Miscellaneous papers on oenothera. Oenothera; Primroses. 262 BOTAXICAL GAZETTE color as in the parent form, but much more crinkled and uneven, not as gray as in 0. ca>ia, nor as hairy as in this form. The impossibiht>- of distinguishing the young plants before planting out evidently makes this mutant less fit for the determi- nation of splitting percent- ages, because the sorting and counting has to be done on the beds. In my experiments I have ahvaj's counted the indix-iduals of the two types at the begin- ning of the flowering period, since at this time the Kmits between the two grou
. Miscellaneous papers on oenothera. Oenothera; Primroses. 262 BOTAXICAL GAZETTE color as in the parent form, but much more crinkled and uneven, not as gray as in 0. ca>ia, nor as hairy as in this form. The impossibiht>- of distinguishing the young plants before planting out evidently makes this mutant less fit for the determi- nation of splitting percent- ages, because the sorting and counting has to be done on the beds. In my experiments I have ahvaj's counted the indix-iduals of the two types at the begin- ning of the flowering period, since at this time the Kmits between the two groups are the most sharp. Moreover, this simi- larity between the mutant and the parent species must diminish the chances of discovering mutant specimens of the new t^'pe. This is probably the reason why it was not observed before 1911. Since that year new mutants of the palksccns t}'pe have more than once arisen from 0. Lamarckiaua and from some of its derivatives, especially in 1914. All of these mutants exacth' resembled the first one in their whole structure and in all their marks. I have made pedigree cultures of the offspring of my first three mutants. These arose from seed of the same parent plant of 1909, which belonged to the second generation of a guarded strain of 0. Lamarckiana, derived from a rosette collected in 1905 in the original field near Hilversum. One part of this seed was sown in 1910 and yielded, among about 500 specimens, i pallescens, together \\-ith I rubriiiervis, 3 oblonga, 2 lata, 1 scintillans, 1 nanella, the. Fig. 4.—Oenolhcra Lamarckiana mut. pal- esccns: 3 typical leaves of the rosette of radical June 16, 1914. leaves;. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Vries, Hugo de, 1848-1935. Berlin, Leipzig, etc. , etc.
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