Oxalis violacea has perfectly glabrous petioles throughout most of its range, while O. violacea var. trichophora has petioles more or less densely covered with spreading multicellular hairs. Throughout much of the range of the species mass collections have been made by the writer and by several of his, students. Each collection consists of a leaf, including petiole, from each plant in an area, and has usually been accompanied by several entire plants. These leaves have been sorted into three groups: the first consists of typical O. violacea with perfectly glabrous petioles; the second group consists of petioles with sparse pubescence, and are treated; as var. trichophora, but intermediate; the third group includes petiolles which are copiously pubescent and imay be considered extreme var. trichophora. The second and third groups grade into each other but are quite distinct from the completely glabrous typical O. violacea. Table 1 shows the number of individuals of each group in each collection.