Published in Botanical Museum Leaflets, Harvard University, in 1949, in volume 13, pages 153-192

Published in Botanical Museum Leaflets, Harvard University, in 1949, in volume 13, pages 213-247

Published in Botanical Museum Leaflets, Harvard University, in 1949, in volume 13, pages 293-323

Published in Botanical Museum Leaflets, Harvard University, in 1949, in volume 13, pages 325-332

Published in Botanical Museum Leaflets, Harvard University, in 1949, in volume 14, pages 21-47

Published in Botanical Museum Leaflets, Harvard University, in 1949, in volume 14, pages 49-77

Published in Botanical Museum Leaflets, Harvard University, in 1949, in volume 14, issue 4, pages 1-20