Published in Botanical Museum Leaflets, Harvard University, in 1950, in volume 14, pages 79-86

Published in Botanical Museum Leaflets, Harvard University, in 1950, in volume 14, pages 87-96

Published in Botanical Museum Leaflets, Harvard University, in 1950, in volume 14, pages 97-105

Published in Botanical Museum Leaflets, Harvard University, in 1950, in volume 14, pages 107-108

Published in Botanical Museum Leaflets, Harvard University, in 1950, in volume 14, pages 109-136

Published in Botanical Museum Leaflets, Harvard University, in 1950, in volume 14, pages 137-155

Published in Botanical Museum Leaflets, Harvard University, in 1950, in volume 14, pages 157-180