Published in Botanical Museum Leaflets, Harvard University, in 1944, in volume 11, pages 173-200

Published in Botanical Museum Leaflets, Harvard University, in 1944, in volume 11, pages 201-214

Published in Botanical Museum Leaflets, Harvard University, in 1944, in volume 11, pages 215-216

Published in Botanical Museum Leaflets, Harvard University, in 1944, in volume 11, pages 217-248