Published in Botanical Museum Leaflets, Harvard University, in 1973, in volume 23, pages 213-244

Published in Botanical Museum Leaflets, Harvard University, in 1973, in volume 23, pages 273-284

Published in Botanical Museum Leaflets, Harvard University, in 1973, in volume 23, pages 285-297

Published in Botanical Museum Leaflets, Harvard University, in 1973, in volume 23, pages 305-324