Abstract
Pollen morphology of nine species representing four genera: Cephalaria Schrad, Dipsacus L., Pterocephalus Vaill. and Scabiosa L. of the family Dipsacaceae in Iran has been investigated by means of scanning electron microscopy (SEM). The results showed that pollen grains were triporate and tricolpate. The pollen type of Scabiosa rotata Bieb. (tri- and tetraporate) is the first report in the world. The sizes of pollen grains fall into the classification group magna (pollen grain diameter 50–100 μm). Pollen shapes vary from preoblate to prolate and their polar views were triangulate and lobate. The exine ornamentation varies from gemmate in S. rotata to spinulate in the rest studied species. Species of Scabiosa have been dispersed in UPGMA tree that this confirmed the previous studies about taxonomic problems and species complexity in this genus. These results show the transfer of the some Scabisoa species to Lomelosia Raf. based on palynological characters. Pollen morphology of the family is helpful at the generic and specific level.Bangladesh J. Plant Taxon. 24(2): 129–136, 2017 (December)
Highlights
The family Dipsacaceae consists of around 10-13 genera and more or less 300 species (Ehrendorfer, 1965; Verlaque, 1977; Mabberley, 2008) of annual to perennial herbs and shrubs that occur primarily in the Mediterranean Basin, with about 20% distributed in Asia and Africa
This study reports the pollen morphology of some species in the family Dipsacaceae from Iran in order to establish their availability for future taxonomic works
Equatorial axis (E) length of pollen grains ranged from the smallest size in P. plumosus (54.93 μm) to the largest size in S. caucasica (92.47μm)
Summary
The family Dipsacaceae consists of around 10-13 genera and more or less 300 species (Ehrendorfer, 1965; Verlaque, 1977; Mabberley, 2008) of annual to perennial herbs and shrubs that occur primarily in the Mediterranean Basin, with about 20% distributed in Asia and Africa. In Iran, Dipsacaecae is represented by 54 species belonging to five genera distributed in different regions (Jamzad, 1993). Delimitation of taxa within the family has always been subject to argument; circumscription of genera and tribes has repeatedly changed over of the overall morphological similarity among the taxa in the family. Verlaque (1984) divided this family into three tribes with nine genera. Caputo and Cozzolino (1994) divided Dipsacaceae into two major clades (based on morphological and palynological characters), one includes Dipsacus and Cephalaria, the other contain the remaining genera Verlaque (1984) divided this family into three tribes with nine genera. Caputo and Cozzolino (1994) divided Dipsacaceae into two major clades (based on morphological and palynological characters), one includes Dipsacus and Cephalaria, the other contain the remaining genera
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