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