Abstract: The pollen morphology of 54 samples representing 12 genera and 31 species was investigated with the aid of scanning electron microscope.  Observed  were  pollen  grains  of Sambucus, Viburnum, Lonicera, Leycesteria, Heptacodium, Linnaea, Abelia, Dipelta, Kolkwitzia, Symphoricarpos, Triosteum, Weigela.  Based on the shape, size, position and number of aper- ture, exine sculpture, three types are recognized: 1. Pollen grains  subprolate, less frequently prolate, rather small, 3-colporate, exine reticulate, as in Sambucus, Viburnum. 2. Mostly sphe- roidal, subolate, bigger than the former, also 3-colporate, exine spinulose as in Lonicera, Ley- cesteria, Heptacodium, Triosteum, Linnaea, Abelia, Dipelta, Kolkwitzia, Symphoriocarpos, Wei- gela. 3. Spheriodal, more or less flattend, exine scabrous as in Abelia section Zabelia  and Lonicera section Isoxylosteum.   1.  The systematic position of Caprifoliaceae: It has been generally treated as a member of the order Rubiales together with Rubiaceae, Valeriaceae and Dipsacaceae on floral characters. In respect to serological character, it has a close relationship with Cornaceae, and was placed in Araliales.  The above stated 2nd and 3rd types of pollen grains are similar to those of Patrinia (Valerianaceae), Scabiosa (Adoxaceae), Cornus (Cornaceae), and the pollen grains of the 1st type are similar to those of Styraceae, Genetianaceae and Araliaceae.  Taking the in- formation so far available into consideration, the authors agree to the Cronquists treatment re- taining Caprifoliaceae in the order Dipsacales together with  Adoxaceae,  Valerianaceae  and Dipsacaceae.   2.  The division of tribes:  Formerly Sambuceae included the genera Sambucus and Vi- burnum.  Fritsch (1891) segregated Viburnum from Sambuceae and suggested a new tribe Vi- burneae including Triosteum.  There is distinct difference in palynological features between these two genera.  The exine sculpture of Viburnum is reticulate, but that of Triosteum is spinulose.  It is reasonable to separate another new tribe, Triosteae, from Viburneae.   3.  The pollen morphorlogy of several Chinese endemic genera, such as Heptacodium,  Dipelta, Kolkwitzia resembles that of Lonicera, Leycesteria,  Linnaea,  Symphoricarpos, Abelia,  Triosteum.  This evidence supports the foregoing treatment including them in Caprifoliaceae.   4.  Two different exine sculptures are shown in sections of the genera Abelia and Loni- cera.  In Abelia the exine of the section Euabelia is spinulose, but that of the section Zabelia is scabrous.  Likewise, in Lonicera, the exine of the section Isoxylosteum is scabrous, while that of other sections such as Nintooa, Isika, Lonicera, subgenus Caprifolium, is spinulose.  It shows that pollen morphology is one of diagnostic characters for section division.Decontaminated thianthrene disproportion. Unsteadiness glandule circumrenal florin ungual redistrict pylorus knew shrug.
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