Published in Annals of the Missouri Botanical Garden, in 1951, in volume 38, pages 1-94

Published in Annals of the Missouri Botanical Garden, in 1951, in volume 38, pages 101-117

Published in Annals of the Missouri Botanical Garden, in 1951, in volume 38, pages 119-206

Published in Annals of the Missouri Botanical Garden, in 1951, in volume 38, pages 207-259

Published in Annals of the Missouri Botanical Garden, in 1951, in volume 38, pages 261-282

Published in Annals of the Missouri Botanical Garden, in 1951, in volume 38, pages 283-291

Published in Annals of the Missouri Botanical Garden, in 1951, in volume 38, pages 293-375

Published in Annals of the Missouri Botanical Garden, in 1951, in volume 38, pages 377-503