Published in Annals of the Missouri Botanical Garden, in 1968, in volume 55, pages 1-30

Published in Annals of the Missouri Botanical Garden, in 1968, in volume 55, pages 51-59

Published in Annals of the Missouri Botanical Garden, in 1968, in volume 55, pages 64-67

Published in Annals of the Missouri Botanical Garden, in 1968, in volume 55, pages 68-69

Published in Annals of the Missouri Botanical Garden, in 1968, in volume 55, pages 79

Published in Annals of the Missouri Botanical Garden, in 1968, in volume 55, pages 179-192

Published in Annals of the Missouri Botanical Garden, in 1968, in volume 55, pages 193-293

Published in Annals of the Missouri Botanical Garden, in 1968, in volume 55, pages 294-364

Published in Annals of the Missouri Botanical Garden, in 1968, in volume 55, pages 365-367

Published in Annals of the Missouri Botanical Garden, in 1968, in volume 55, pages 372-391

Published in Annals of the Missouri Botanical Garden, in 1968, in volume 55, pages 392-396

Published in Annals of the Missouri Botanical Garden, in 1968, in volume 55, pages 397