POLLEN FLORA OF PAKISTAN – LXVIII
Pollen morphology 20 species of the family Alliaceae from Pakistan has been examined by light and scanning electron microscope. Pollen grains are usually bilateral, hetropolar mostly boat shaped, sexine thicker tor thinner than nexine. Tectal surface is mostly rugulate foveolate or subpsilate rarely reticulate. On the basis of apertural types 3 distinct pollen types are recognized, viz., Allium fedtschenkoanum –type, Allium grifthianum-type and Allium roylei-type.
[A study on pollen morphology of Dipsacus].
OBJECTIVE
To study the pollen morphology of Dipsacus L. produced in China.


METHOD
Examining the pollen morphology of 17 species and 2 varieties of Dipsacus L. with light microscope and scanning electron microscope.


RESULT
The shape of pollen grains is spheroidal and the aperture is tricolpate. The ornamentation of exine may be divided into 3 types: dispinulate-reticulate, dispinulate-foveolate, dispinulate-rugulate or nearly smooth.


CONCLUSION
Dipsacus is a natural class group, and the slight difference of its pollen grains is useful to some extent in the division of species.
Rapports entre les Valerianaceae, les Morinaceae et les Dipsacaceae
ResumeLes caracteres morphologiques, caryologiques et biogeographiques ont permis d'etablir les rapports existant entre les Valerianaceae et les Dipsacaceae, et les deux genres intermediaires Triplostegia Wall, et Morina L.Le genre monospecifique Triplostegia est rattache a la famille des Valerianaceae.Le genre Morina est isole en une famille monogenerique: les Morinaceae.