A TRIBO EUPHORBIEAE DUMORT (EUPHORBIACEAE) NA CHAPADA DIAMANTINA, BAHIA, BRASIL: PALINOLOGIA E IMPLICAÇÕES TAXONÔMICAS

Abstract

(The tribe Euphorbieae Dumort (Euphorbiaceae)
in Chapada Diamantina, Bahia, Brasil:
Palinology and Taxonomic Implication). This
work dealt with 16 species of the genera of
three genera: Chamaesyce Gray (C. hyssopifolia,
C. hirta, C. prostrata, C. tamanduana and C.
potentilloides), Euphorbia L. (E. appariciana,
E. gymnoclada, E. sessilifolia, E. sarcodes,
E. goyazensis, E. crossadenia, E. comosa and
E. heterodoxa), and Poinsettia Graham (P.
heterophylla and P. insulana). The pollen
grains were acetolised, and analysed through
optic microscopy and photomicrographied.
The pollen grain of the species studied were
characterized as: small to medium sized; prolate spheroidal, prolate, subprolate, 3-
colporate, ectoaperture with psilate, thin or
large margin (absence in Poinsettia pollen
grains); microrreticulate, reticulate or perforate exina. There were recognized three
pollinic types, based on exina ornamentation
and apertures: type Chamaesyce, type Euphorbia and type Poinsettia. All genera studied
presented stenopalynous condition in the level
of the species.