Published in Gayana Botanica, in 1991, in volume 48, pages 17-66
Published in Gayana Botanica, in 1991, in volume 48, pages 67-80
Published in Gayana Botanica, in 1991, in volume 48, pages 81-87
Published in Gayana Botanica, in 1991, in volume 48, pages 115-118
Published in Gayana Botanica, in 1991, in volume 48, pages 119-120
Published in Gayana Botanica, in 1991, in volume 48, pages 121-126
Published in Gayana Botanica, in 1991, in volume 48, issue 1-4, pages 11-15
Published in Gayana Botanica, in 1991, in volume 48, issue 1-4, pages 89-99
Published in Gayana Botanica, in 1991, in volume 48, issue 1-4, pages 101-110
Published in Gayana Botanica, in 1991, in volume 48, issue 1-4, pages 111-114