Abstract
Interspecific pollen tube growth within the Banksia genus was investigated using controlled hand pollinations of B. prionotes and B. menziesii and a putative natural interspecific hybrid between B. prionotes and B. hookeriana, registered in 1991 as the cultivar Waite Orange, was studied using morphological and biochemical characters. Success of pollen tube growth in the pistil following interspecific pollination to B. prionotes and B. menziesii was largely related to taxonomic distance between the species, and the results indicated close affinity between the series Banksia and Crocinae. Control of pollen tube growth in the pistil was imposed in the pollen presenter, a specialized area of the distal style, and in the upper style. Hybrid status cv Waite Orange was confirmed using morphological characters, and isozyme and arbitrarily primed polymerase chain reaction (AP-PCR) analysis confirmed that the two parent species were sister taxa.
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