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