Published in Botanical Museum Leaflets, Harvard University, in 1957, in volume 17, pages 241-246

Published in Botanical Museum Leaflets, Harvard University, in 1957, in volume 17, pages 247-264

Published in Botanical Museum Leaflets, Harvard University, in 1957, in volume 17, pages 265-316

Published in Botanical Museum Leaflets, Harvard University, in 1957, in volume 18, pages 1-56

Published in Botanical Museum Leaflets, Harvard University, in 1957, in volume 18, pages 57-76