Other indicator plants for sulfur and calcium, such as " Eriogonum inflatum " and " Oenothera caespitosa " help to identify likely areas also, especially in conjunction with the selenium indicators.
32.
He completed this second B . Sc . in 1905, focusing on botany, before accepting a Senior Fellowship at University of Chicago where he completed his Ph . D . on heredity in Oenothera lata ( evening primrose ) in 1908.
33.
De Vries looked for evidence of mutation extensive enough to produce a new species in a single generation and thought he found it with his work breeding the evening primrose of the genus " Oenothera ", which he started in 1886.
34.
However, it was a researcher in that lab, Hermann Joseph Muller, who determined in 1918 that the new varieties de Vries had observed while breeding " Oenothera " were the result of polyploid hybrids rather than rapid genetic mutation.
35.
DeVries's ideas were very influential in the first two decades of the 20th century as some felt mutation theory could explain the sudden emergence of new forms in the fossil record and research on " Oenothera " spread all over the world.
36.
He was then hired by Bureau of Plant Industry of the United States Department of Agriculture, where he worked on plant nutrition and biochemistry as well as taxonomy, and began publishing on the genetics of the genus " Oenothera " ( evening primroses ), which he pursued into his years at Michigan and for which he became widely known.
37.
Several genera are synonymized in the classification presented above, in particular " Calylophus " and " Gaura ", which have both been absorbed into " Oenothera "; since they still appear often in the literature as belonging to the previous genera, those names remain in place for now with suitable links to the proper genus.
