. Bulletin. Agriculture. 28 DIMOBPHIC BRANCHES IN CROP PLANTS. The most extreme result of the transfer to new conditions is shown when the phmts fail to fomi any fruiting branches, all the branches beinir chanired over to the vea^etative form (fiar. 2). Such plants, of necessity, remain completely sterile, there being no place where fruit can be put on. in spite of the most luxuriant vegetative growth. "Where the reaction is less violent the plants are not completely sterile. but produce a late crop, often cut off by frost before any of the seed has ripened (fig. 3). Even when t
. Bulletin. Agriculture. 28 DIMOBPHIC BRANCHES IN CROP PLANTS. The most extreme result of the transfer to new conditions is shown when the phmts fail to fomi any fruiting branches, all the branches beinir chanired over to the vea^etative form (fiar. 2). Such plants, of necessity, remain completely sterile, there being no place where fruit can be put on. in spite of the most luxuriant vegetative growth. "Where the reaction is less violent the plants are not completely sterile. but produce a late crop, often cut off by frost before any of the seed has ripened (fig. 3). Even when the plants are all able to ripen seed the crop may be cut short and the quality rendered inferior be- cause too many vegetative branches are fomied and the bolls develop too late in the season. A oradual return of the plants to their normal habits of branching has marked the progress of acclimatization. The fertility of the imported stocks has also continued to increase so that many varieties of the Central American cottons are now able to grow in Texas in a completely nor- mal manner, under the same conditions that render plants of the same stocks abnormal and unfruitful if grown from imported seed. The relation of the fac- tor of branch dimorphism to the problem of acclima- tization that first became apparent in dealing with the Kekchi type of Upland cotton from Guatemala has been shown in differing de- grees in many other types, including the Egyptian that has been introduced into Arizona and southern California. In all such cases the reduction of the vegetative branches may l)e looked upon as one of the measures of acclimatization, since it rep- resents a better adjustment to the new conditions. The collection of statistical data on this point in connection with the Eg^-ptian cotton was entrusted to Mr. Arg\le McLachlan. A report of his observa- tions on Egyptian cotton growing in the Yuma Valley in the season of 1909 shows very definite contrasts in the production of vegeta
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