http://onlinelibrary.wiley.com/doi/10.1111/j.1399-3054.2006.00724.x/full --->
General information on flowers and initiation/reproduction. A study is shown on 'woody perennials', a study of perennial trees. There is no clear conclusion that they have come to. Perennials are flowering and maintaining growth through the season. A study of citrus shows the growth of a perennial plant.
http://www.jstor.org/discover/10.2307/2462951?uid=3739856&uid=2129&uid=2&uid=70&uid=4&uid=3739256&sid=21103233836413
A research study on the limit of pollen in perennial flowers and how they react. The less pollen impacts the reproduction of the plant.
http://aggie-horticulture.tamu.edu/wildseed/growing/annual.html
Annual flowers reproduce by leaving a dormant seed. Perennials live through all the seasons. Biennials are plants with a life cycle of 2 years. Annual/perennial plants can be either based on where they are.
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