Pollination is a fundamental component of a flowering plant's life cycle and begins with the attachment of a pollen grain to the sticky stigma. Following fixture, the pollen grain initiates growth of the pollen tube toward the ovary at a distance known as the style. Although the pollen tube receives most of its nutrients from surrounding tissues, components of its energy are directly supplied by the pollen grain. This study tested the existence of a correlation between style length and pollen grain size. 28 species of polemoniaceous flowers were collected in May 1998 from Stanford University in Stanford, CA. Style length and pollen grain diameter were measured. I found a significant correlation between the style length and pollen grain volume in 28 floral species of 16 different families and five species from the family Fabacaea. This research may demonstrate the importance of pollen grain food reserves in sustaining pollen tube growth.