. Genetics in relation to agriculture. Livestock; Heredity; Variation (Biology); Plant breeding. MUTATIONS 277 a species in which the transformation into new forms was proceeding on a scale large enough to make possible the direct observation of species formation. In none of the particular races that he collected did he observe profound discontinuous variations until in 188G he discovered a feral group of large-flowered evening primroses {(Enothera lamarcldana) growing in a suburb of Amsterdam. They had escaped into an abandoned potato field from a nearby park. The source of this particular ev
. Genetics in relation to agriculture. Livestock; Heredity; Variation (Biology); Plant breeding. MUTATIONS 277 a species in which the transformation into new forms was proceeding on a scale large enough to make possible the direct observation of species formation. In none of the particular races that he collected did he observe profound discontinuous variations until in 188G he discovered a feral group of large-flowered evening primroses {(Enothera lamarcldana) growing in a suburb of Amsterdam. They had escaped into an abandoned potato field from a nearby park. The source of this particular even- ing primrose has been traced by do Vries. About the middle of the 19th. Fig. 114.— CEnoihera lantarckiana. {From a painting. See de Vries, Gruppeniveise Art- bilduvg.) century seeds of (E. lamarcldana were imported into England from Texas. De Vries' race came from an estate near Hilversum, the seed having been obtained originally from an establishment in Erfurt, which de Vries thinks must have obtained their seed from England. It has never been found as an indigenous species either in Europe or America. This beautiful plant is much prized as an ornamental and is known to have escaped from cultivation in various places. "Lamarck's evening primrose is a stately plant, with a stout stem, attaining often a height of meters and more (see Fig. 114). When not crowded the main stem is surrounded by a large circle of smaller branches, growing upward Digitized by Microsoft®. 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 Babcock, E. B. (Ernest Brown), b. 1877; Clausen, Roy Elwood, 1891-. New York, McGraw-Hill; [etc. , etc. ]
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