. Miscellaneous papers on oenothera. Oenothera; Primroses. I9I5] BARTLETT—MUTATION IN OENOTHERA 99 whether or not mut. nummularia is really as nearly self-sterile as this conaparison would indicate. At any rate, only 403 seeds, many of them obviously too unripe to germinate, were obtained from 3 plants of the mutation. The seeds have given an Fi progeny of 13s plants which is now (April 1914) in the early seedling stage. The Fi generation from mut. nummularia consists in part of plants which exactly reproduce the parental type and in part of secondary mutations. At the time this article is bei
. Miscellaneous papers on oenothera. Oenothera; Primroses. I9I5] BARTLETT—MUTATION IN OENOTHERA 99 whether or not mut. nummularia is really as nearly self-sterile as this conaparison would indicate. At any rate, only 403 seeds, many of them obviously too unripe to germinate, were obtained from 3 plants of the mutation. The seeds have given an Fi progeny of 13s plants which is now (April 1914) in the early seedling stage. The Fi generation from mut. nummularia consists in part of plants which exactly reproduce the parental type and in part of secondary mutations. At the time this article is being written the plants are stUl young, but it is nevertheless clear (i) that the. Fig. 8.—Flowers and buds of (a) Oenothera pratincola mut. nummularia, and (6) typical 0. pratincola, showing especially the difference in the rupture of the calyx. Fi generation includes no typical 0. pratincola; (2) that the second- ary mutations (with one possible exception) are narrower leaved than 0. pratincola and therefore even more sharply distinguished from mut. nummularia than the latter is from 0. pratincola; and (3) that all of the secondary mutations (again with the single excep- tion noted above) appear to be quite identical with certain primary mutations which have appeared simultaneously with mut. num^ mularia in various cultures of typical 0. pratincola. The secondary mutations fall into three well marked groups which have been called mut. tortuosa, mut. rubricentra, and 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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