Pollen morphology of Begonia L. (Begoniaceae) in Nepal

Sangeeta Rajbhandary, Mark Hughes, Krishna K. Shrestha

Abstract

The pollen morphology of 28 Begonia species of Nepal has been examined by scanning electron microscopy (SEM). Comparative pollen analysis was made based on size, shape in polar and equatorial views, P/E ratio, aperture, and exine ornamentation. In this study, four types of pollen ornamentation morphology have been identified. Among Nepalese Begonia, B. roxburghii (section Sphenanthera) has the smallest pollen (11.2- 12.8 × 6.4-7.0 μm) and B. flagellaris (section Diploclinium) has the largest pollen (24.3- 30.6 × 11.4-12.0 μm). Presence of margo in the pollen ornamentation is a distinguishing character that separates Begonia section Platycentrum from all other sections of Nepalese Begonia.

DOI: http://dx.doi.org/10.3329/bjpt.v19i2.13134

Bangladesh J. Plant Taxon. 19(2): 191-200, 2012 (December)

Keywords

Begonia L.; Nepal; Pollen morphology; SEM
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