科研之友
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摘要
fourteen species of convolvulaceae from catimbau national park were recognized. based on pollen-grain morphology, the taxons were split into two groups: psiloconiae - evolvulus elegans moric, e. frankenioides moric, e. glomeratus choisy, e. linarioides meisn, j. densiflora hallier, j. montana meisn, jacquemontia sp. and merremia cissoides hallier, and echinoconieae - ipomoea bahiensis willd., i. brasiliana (choisy) meissn, i. rosea choisy, i. pintoi o%26apos;donnel, i. subincana meisn, and turbina cordata (choisy) austin %26 staples. evolvulus species are distinguished by differences in exine thickness and pollen-grain diameter. merremia cissoides has tricolpate pollen grains and bifid columellae. the pollen grains of both ipomoea and turbina are echinate; however, the spines have a bulbous base only in ipomoea. this paper confirms the high diversity of pollen morphology in the family.
