Citation for the data package: Ishihara, M. I. 2012. Role of axis reversal from the short-shoot to long-shoot habit for crown maintenance in slow-growing Betula maximowicziana trees. American Journal of Botany. Data collector: Masae I. Ishihara Correspondence for the data package: Masae I. Ishihara (masaish.n@gmail.com). Date of data creation: 20121106. Content of the data package 1. AxisReversal1RcodeGLMM.txt. This is the R code for generalized linear mixed models (GLMMs) to test the effect of tree growth rate on the probability of lateral axes having reversed. 2. AxisReversal2AxisFateData.txt. This is a data table used for GLMMs. 3. AxisReversal3RcodeLMM.txt. This is the R code for linear mixed models (LMMs) to test the effects of lateral-axis type and its location on the growth of lateral axes. 4. AxisReversal4AxisLocGrowthData.txt This is a data table used for LMMs. Description of data Meanings of the columns of data tables are given in each text file.