R. Scheel et al., POLLEN MORPHOLOGY OF THE BORAGINACEAE FROM SANTA-CATARINA STATE (SOUTHERN BRAZIL), WITH COMMENTS ON THE TAXONOMY OF THE FAMILY, Grana, 35(3), 1996, pp. 138-153
The pollen morphology of 30 Boraginaceae taxa native to the Santa Cata
rina State was investigated by both light and scanning electron micros
copy. The species were classified into nine pollen types on the basis
of aperture characteristics and surface ornamentation. Sub-types were
defined with regard to differences in shape, surface ornamentation and
the number of apertures. The general agreement of these pollen types
with taxonomic classifications was verified, with a few exceptions. An
extensive re-evaluation of the systematics of the subfamily Heliotrop
ioideae, especially of the genus Heliotropium, is suggested.