Published in Botanical Museum Leaflets, Harvard University, in 1959, in volume 18, pages 245-272
Published in Botanical Museum Leaflets, Harvard University, in 1959, in volume 18, pages 273-304
Published in Botanical Museum Leaflets, Harvard University, in 1959, in volume 18, pages 305-319
Published in Botanical Museum Leaflets, Harvard University, in 1959, in volume 18, pages 321-327
Published in Botanical Museum Leaflets, Harvard University, in 1959, in volume 18, pages 329-356
Published in Botanical Museum Leaflets, Harvard University, in 1959, in volume 18, pages 357-387
Published in Botanical Museum Leaflets, Harvard University, in 1959, in volume 18, pages 389-411
Published in Botanical Museum Leaflets, Harvard University, in 1959, in volume 18, pages 413-427
Published in Botanical Museum Leaflets, Harvard University, in 1959, in volume 18, pages 428-440