Published in Annals of the Missouri Botanical Garden, in 1970, in volume 57, pages 158-209

Published in Annals of the Missouri Botanical Garden, in 1970, in volume 57, pages 257-258

Published in Annals of the Missouri Botanical Garden, in 1970, in volume 57, pages 263-264

Published in Annals of the Missouri Botanical Garden, in 1970, in volume 57, pages 380-381