Heterostyly

Heterostyly is a unique form of polymorphism and herkogamy in flowers. In a heterostylous species, two or three morphological types of flowers, termed morphs, exist in the population. On each individual plant, all flowers share the same morph. The flower morphs differ in the lengths of the pistil and stamens, and these traits are not continuous. T...
Found on http://en.wikipedia.org/wiki/Heterostyly

heterostyly

(from the article `pollination`) ...and oats. Avocado has both protogynous and protandrous varieties, and these often are grown together to encourage cross-fertilization. A ...
Found on http://www.britannica.com/eb/a-z/h/45

heterostyly

In botany, having styles of different lengths. Certain flowers, such as primroses (Primula vulgaris), have different-sized anthers and styles to ensure cross-fertilization (through pollination) by visiting insects
Found on http://www.talktalk.co.uk/reference/encyclopaedia/hutchinson/m0020508.html
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