Published in Botanical Museum Leaflets, Harvard University, in 1974, in volume 23, pages 325-336

Published in Botanical Museum Leaflets, Harvard University, in 1974, in volume 23, pages 337-367

Published in Botanical Museum Leaflets, Harvard University, in 1974, in volume 23, pages 369-375

Published in Botanical Museum Leaflets, Harvard University, in 1974, in volume 23, pages 375-376

Published in Botanical Museum Leaflets, Harvard University, in 1974, in volume 24, pages 29-36

Published in Botanical Museum Leaflets, Harvard University, in 1974, in volume 24, pages 37-48