Published in Botanical Museum Leaflets, Harvard University, in 1937, in volume 4, pages 173-180

Published in Botanical Museum Leaflets, Harvard University, in 1937, in volume 4, pages 85-89

Published in Botanical Museum Leaflets, Harvard University, in 1937, in volume 4, pages 101-126

Published in Botanical Museum Leaflets, Harvard University, in 1937, in volume 4, pages 127-128

Published in Botanical Museum Leaflets, Harvard University, in 1937, in volume 5, pages 33-35

Published in Botanical Museum Leaflets, Harvard University, in 1937, in volume 5, pages 36-37

Published in Botanical Museum Leaflets, Harvard University, in 1937, in volume 5, pages 41-48

Published in Botanical Museum Leaflets, Harvard University, in 1937, in volume 5, pages 49-60

Published in Botanical Museum Leaflets, Harvard University, in 1937, in volume 5, issue 4, pages 31-32