Published in Botanical Museum Leaflets, Harvard University, in 1936, in volume 4, pages 9-19

Published in Botanical Museum Leaflets, Harvard University, in 1936, in volume 4, pages 21-25

Published in Botanical Museum Leaflets, Harvard University, in 1936, in volume 4, pages 31-35

Published in Botanical Museum Leaflets, Harvard University, in 1936, in volume 4, pages 36-38

Published in Botanical Museum Leaflets, Harvard University, in 1936, in volume 4, pages 47-51

Published in Botanical Museum Leaflets, Harvard University, in 1936, in volume 4, pages 52-63

Published in Botanical Museum Leaflets, Harvard University, in 1936, in volume 4, issue 4, pages 8