Published in Annals of the Missouri Botanical Garden, in 1960, in volume 47, pages 1-23

Published in Annals of the Missouri Botanical Garden, in 1960, in volume 47, pages 25-68

Published in Annals of the Missouri Botanical Garden, in 1960, in volume 47, pages 69-71

Published in Annals of the Missouri Botanical Garden, in 1960, in volume 47, pages 73-80

Published in Annals of the Missouri Botanical Garden, in 1960, in volume 47, pages 205-226

Published in Annals of the Missouri Botanical Garden, in 1960, in volume 47, pages 243-261

Published in Annals of the Missouri Botanical Garden, in 1960, in volume 47, pages 263-359