Published in Botanical Museum Leaflets, Harvard University, in 1945, in volume 11, pages 249-260

Published in Botanical Museum Leaflets, Harvard University, in 1945, in volume 11, pages 261-296

Published in Botanical Museum Leaflets, Harvard University, in 1945, in volume 12, pages 33-75

Published in Botanical Museum Leaflets, Harvard University, in 1945, in volume 12, pages 89-116