Published in Annals of the Missouri Botanical Garden, in 1955, in volume 42, pages 101-102

Published in Annals of the Missouri Botanical Garden, in 1955, in volume 42, pages 131-149

Published in Annals of the Missouri Botanical Garden, in 1955, in volume 42, pages 151-152

Published in Annals of the Missouri Botanical Garden, in 1955, in volume 42, pages 171-194

Published in Annals of the Missouri Botanical Garden, in 1955, in volume 42, pages 195-211

Published in Annals of the Missouri Botanical Garden, in 1955, in volume 42, pages 213-214

Published in Annals of the Missouri Botanical Garden, in 1955, in volume 42, pages 215-302