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