Published in Gayana Botanica, in 1992, in volume 49, pages 11-15
Published in Gayana Botanica, in 1992, in volume 49, pages 17-24
Published in Gayana Botanica, in 1992, in volume 49, pages 25-30
Published in Gayana Botanica, in 1992, in volume 49, pages 35-42
Published in Gayana Botanica, in 1992, in volume 49, pages 43-45
Published in Gayana Botanica, in 1992, in volume 49, pages 47-70