(1993)  Page(s) 550.  
 
....The number of flowers present on male plants of R. setigera is greater than on females....Both plants produce copious pollen; however, the pollen of the flowers of female plants is mostly malformed and nonfunctional. In pollen viability tests, the pollen of flowers of male plants produce a pollen tube from over 60% of its pollen whereas pollen from female flowers does not form a pollen tube....