A principal components analysis of total tree form was conducted for five oak species and two maple species sampled from stands growing in The Pennsylvania State University Experimental Forest. The principal components coefficients provided readily interpretable expressions of intraspecific tree form variation for all species except red maple. A bole form quotient similar to Girard form class constituted the low-order axis in all species. Differences between species were evident, but the results suggest that indices of relative crown depth and relative crown diameter may have utility in biomass inventory. Forest Sci. 30:64-70.