Published in Annals of the Missouri Botanical Garden, in 1959, in volume 46, pages 1-17
Published in Annals of the Missouri Botanical Garden, in 1959, in volume 46, pages 19-37
Published in Annals of the Missouri Botanical Garden, in 1959, in volume 46, pages 39-193
Published in Annals of the Missouri Botanical Garden, in 1959, in volume 46, pages 195-256
Published in Annals of the Missouri Botanical Garden, in 1959, in volume 46, pages 257-358