Document Type : Original Article

 Aedo, C. et al. 2007. Taxonomic revision of Geranium Subsect. Mediterranean (Geraniaceae). Syst. Bot. 32. pp. 93-128.
 Al-Quran, S. A. 2004. Pollen morphology Plantaginaceae in Jordan. Pak. J.     Bio. Sc. pp. 1594-1602.
 Bortenschlager, S. 1967. Vorlaufige Mitteilungen zur Pollen morphologie in der Sequences from der Geraniaceen und inher systimatiche Bedeutumg. Grana play. pp. 400-468. 
 Erdtman, G. 1966. Pollen Morphology and Plant Taxonomy. Angiosperm. Hafner publishing Co. New York.
 Erdtman, G. 1969. Handbook of Palynology. pp. 148, 313.
 Erdtman, G. 1971. Pollen morphology and plant taxonomy, angiosperms. New York. pp. 186-187.
 Hesse, M. et al 2009. Pollen Terminology an illustrated handbook. Univ. of Vienna.   pp. 4-64. 
 Huysmans, S. S. et al 2003. Pollen morphology of NW European representatives confirms morphology of Robieae (Rubiaceae). Rev. Paleobot. Palynol. 127. pp. 219-240. 
 Mulder, Ch. 2003. The Northwest European Pollen Flora, 61 Aizoaceae Rev. Paleobot. Palynol. 123. pp. 41-45.
 Olthmann, O. 1967. Pollen morphologich-systematische Unzwrsuchungn   innerhalb der Geraniales. Dissert. Bot. 11. p. 163.
 Perveen A. and Kaiser, M. 1999. Pollen Flora of Pakistan. Univ. of Karachi.  pp. 263-269.
 Shehata, A. A. 2008. Pollen Morphology of Egyptian Geraniaceae: An Assessment of Taxonomic value. Univ. of Alexandria, Egypt. pp. 67-76.
 Stafford, P. J. and Blakhmore, S. 1991. The Northwest European Pollen Flora. Geraniaceae Rev. Palaeon. Plynol. 69. pp. 49-78. 
 Stafford, P. J. and Gibby, M. 1992. Pollen morphology of the genus Pelargonium (Geraniaceae). Rev. Paleobot. Palynol. 71. pp. 79-109.
 Verhoeven, R. L. and Venter, H. J. 1987. Pollen morphology of Erodium in
       South Africa. pp. 279-283. 
 Walker, J. W. and Doyle, J. A. 1976. The basis of Angiosperm phylogen Palynology. Ann. Mo. Bot. Gard. 62. pp. 666-723.