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