mescal bean: shrub or small tree having pinnate leaves poisonous to livestock and dense racemes of intensely fragrant blue flowers and red beans
tree: a tall perennial woody plant having a main trunk and branches forming a distinct elevated crown; includes both gymnosperms and angiosperms
factor analysis: any of several methods for reducing correlational data to a smaller number of dimensions or factors; beginning with a correlation matrix a small number of components or factors are extracted that are regarded as the basic variables that account for the interrelations observed in the data