Published in Botanical Museum Leaflets, Harvard University, in 1972, in volume 23, pages 101-128

Published in Botanical Museum Leaflets, Harvard University, in 1972, in volume 23, pages 129-136

Published in Botanical Museum Leaflets, Harvard University, in 1972, in volume 23, pages 137-147

Published in Botanical Museum Leaflets, Harvard University, in 1972, in volume 23, pages 149-212