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