01708nas a2200145   4500008004100000022001400041245010800055210006900163300001400232490000700246520120200253100001901455700002301474856006501497       1998                        eng d  a0017-313400aPollen, pistil and their interrelations in Borago officinalis and Heliotropium europaeum (Boraginaceae)0 aPollen pistil and their interrelations in Borago officinalis and  a203–2140 v373 a<p>The pollen grains, the pistil, growth of the pollen tube and its pathway are described in Borago officinalis and Heliotropium europaeum. The exine is thick in both taxa but it is covered with dense gemmae in Borago. The intine seems to be thicker and contains more proteins in Borago than in Heliotropium. Starch is very abundant in the latter while it is lacking in the former. The style is hollow in Borago with a stylar canal running from the stigma to the ovary, while in Heliotropium it is broadly cone‐shaped with papillae located at the base of the cone (the &ldquo;stigmatic ring&quot;) and not at the top of the style as usual. In Borago stigmatic papillae are unicellular, skittle‐shaped and have a thick pectocellulosic wall and an equally thick cuticular layer, while in Heliotropium the stigmatic papillae are unicellular, elongated cone‐shaped with a thin pecto‐cellulosic wall and have an apparently reduced cuticular layer. The stigmatic exudate is very abundant on the stigmas of Heliotropium even before anthesis while it is absent on those of Borago except when allo‐pollination occurs. Pollen tube growth has been followed from stigma to ovules in both taxa.</p>
1 aGhorbel, Safia1 aNabli, Mohamed, A.  uhttp://www.tandfonline.com/doi/abs/10.1080/0017313980936266801199nas a2200169   4500008004100000020001400041245013100055210006900186260001200255300001400267490000700281520062500288100001500913700001800928700001800946856006500964       1996                        eng d  a0017-313400aPollen morphology of the Boraginaceae from Santa Catarina state (southern Brazil), with comments on the taxonomy of the family0 aPollen morphology of the Boraginaceae from Santa Catarina state   c1996///  a138 - 1530 v353 aThe pollen morphology of 30 Boraginaceae taxa native to the Santa Catarina State was investigated by both light and scanning electron microscopy. 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 Heliotropioideae, especially of the genus Heliotropium, is suggested.1 aScheel, R.1 aYbert, J., P.1 aBarth, O., M.  uhttp://www.tandfonline.com/doi/abs/10.1080/00173139609429075