Published in Botanical Museum Leaflets, Harvard University, in 1954, in volume 16, pages 179-228

Published in Botanical Museum Leaflets, Harvard University, in 1954, in volume 16, pages 229-240

Published in Botanical Museum Leaflets, Harvard University, in 1954, in volume 16, pages 241-260

Published in Botanical Museum Leaflets, Harvard University, in 1954, in volume 16, pages 261-264

Published in Botanical Museum Leaflets, Harvard University, in 1954, in volume 16, pages 265-303