Studies in the Apocynaceae. I. A Critical Study of the Apocynoideae (With Special Reference to the FGenus Apocynum)Published in Annals of the Missouri Botanical Garden, in 1930, in volume 17, pages 1-212Studies in the Umbelliferae. III. A Monograph of Cymopterus Including a Critical Study of Related GeneraPublished in Annals of the Missouri Botanical Garden, in 1930, in volume 17, pages 213-476
Studies in the Umbelliferae. III. A Monograph of Cymopterus Including a Critical Study of Related GeneraPublished in Annals of the Missouri Botanical Garden, in 1930, in volume 17, pages 213-476