Studies on Ambrosia. II: Effect of Certain Environmental Factors on Floral Development of Ambrosia elatior

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Abstract
1. This report is subsidiary to a genetical study on the floral types of Ambrosia elatior L., recently published. 2. The effect of the environment was determined by comparing the ratios of floral types in treated cultures with a control derived from seed of the same plant of known breeding behavior. 3. The influence of the environment in altering the ratios varied with the strain employed. The monoecious form which is wide-spread in nature was very stable, and was affected only by an increase in photoperiod after floral buds had appeared. Other forms had the ratios of their floral types considerably altered by removal of plumules, by growth under a photoperiod of 20 and 24 hours, and by waterlogged soil. However, the type which predominated in the control always remained dominant in treated cultures. 4. Old staminate flowers of a few plants of different forms developed non-functional pistillate heads as a late season effect. 5. Diseased pistillate heads in the leaf axils developed anthers in supernumerary bracts.

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