Abstract: The pollen morphology of 12 species representing 6 genera was exami- ned under the light;  scanning and transmission electron microscope. According to form of aperture;  sculpture and structure of exine;  the palynological relationships among the 6 gene- ra are discussed.   1.  Scopolia Jacq. (plate 1:1-4)   Pollen grains subspheroidal or irregular;  43.7-49.6 μ in diameter;  nonaperturate;  Exi- ne about 1.2-1.5μ  thick;  verrucate;  with verrucae unequal in size;  spinulose or granular. Stratification indistinct;  with no columella layer visible under TEM.   2.  Anisodus Link et Otto (plate 1: 5-12)   Pollen grains subspheroidal;  43.4-48.7 μ in diameter;  nonaperturate. Exine 1.5-1.8 μ thick;  verrucate;  with verrucae unequal in size;  spinulose or smooth.  Stratification indis- tinct under TEM.   3.  Atropanthe Pascher (plate 2: 1-4)   Pollen grains subspheroidai or spheroidal;  triangular-circular in polar view;  oblong in equatorial view;  47.2-49.3 μ ×39.8-47 μ;  3-colpate;  colpi wide or narrow;  colpus membra- nes finely granular. Exine with irregular short-stick sculpture;  2.3μ thick;  distinctly 2-la- yered;  columella layer clearly visible;  sexine thicker than nexine under TEM.   4.  Przewalskia Maxim. (plate 2: 5-8)  Pollen grains subspheroidal;  triangular-circular in polar view;  oblong in equatorial view; 39.2-40.3 μ × 36.4-42.8 μ ;  tricolporate;  ora lalongate;  colpus membranes granular. Exi- ne reticulate;  2-layered;  2u thick;  columella layer distinct;  sexine and nexine equal in thick- ness under TEM.   5.  Physochlaina G. Don (plate 2: 9-12; plate 3: 1-12) Pollen grains polymorphic;  usually subspheroidal;  36.5-39.4μ in diameter;  aperture varying from nonaperturate (P. macrophylla);  3-4 rugose (P. physaloides) to 3-colporate (P. praealta). Exine 1.5-2μ thick;  reticulate;  smooth or with spinulose or verrucous pro- cesses under SEM;  distinctly 2-layered;  or without stratification;  columella layer differentia- ted or not.   6.  Hyoscyamus Linn. (plate 4: 1-9)   Pollen grains subspheroidal;  circular-triangular in polar view;  oval in equatorial view; 39.9-41.8 μ × 38.7-4.2 μ;  tricolporate. Ora orbicular; colpus membranes finely granular or with striate processes. Exine reticulate or striate-rugulate;  2-2.3μ thick;  distinctly 2-la- yered;  columella layer developed.   The dendrogram (Fig. 1) indicates probable phylogenetic relationships among the sixgenera in the subtribe Hyoscyaminae.

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