Published in Botanical Museum Leaflets, Harvard University, in 1976, in volume 24, pages 193-204

Published in Botanical Museum Leaflets, Harvard University, in 1976, in volume 24, pages 205-224

Published in Botanical Museum Leaflets, Harvard University, in 1976, in volume 24, pages 225-240

Published in Botanical Museum Leaflets, Harvard University, in 1976, in volume 24, pages 241-247

Published in Botanical Museum Leaflets, Harvard University, in 1976, in volume 24, pages 249-274

Published in Botanical Museum Leaflets, Harvard University, in 1976, in volume 24, pages 275-335