Published in Botanical Museum Leaflets, Harvard University, in 1967, in volume 21, pages 249-264

Published in Botanical Museum Leaflets, Harvard University, in 1967, in volume 21, pages 285-287

Published in Botanical Museum Leaflets, Harvard University, in 1967, in volume 21, pages 289-324

Published in Botanical Museum Leaflets, Harvard University, in 1967, in volume 22, pages 1-31

Published in Botanical Museum Leaflets, Harvard University, in 1967, in volume 22, pages 33-63