Tassel-Ears in Corn
RL (Bob) Nielsen, Purdue Agronomy
The male and female reproductive organs of a corn plant are contained in physically separate unisexual flowers (a flowering habit called "monoecious" for you trivia fans.) The tassel represents the male flower on a corn plant, while the ear shoots represent the female flowers. Interestingly, both reproductive structures initiate as perfect (bisexual) flowers, containing both male and female reproductive structures. During the normal course of development, the female components (gynoecia) of the tassel and the male components (stamens) of the ear shoots abort, resulting in the unisexual flowers we come to expect.
Once in a while, the normal development of the tassel alters such that it becomes partly or mostly female reproductive structures, often resulting in actual kernel development. The physiological basis for the survival of the female floral parts on the tassel is likely hormonally-driven, but the environmental "trigger" that alters the hormonal balance is not known.
A "tassel-ear" is an odd-looking affair and is found most commonly on tillers or "suckers" of a corn plant along the edges of a field or in otherwise thinly populated areas of a field. It is very uncommon to find tassel-ears that develop on the main stalk of a corn plant.
Without a protective husk covering, the kernels that develop on tassel-ears are at the mercy of weathering and exposed to hungry birds. Consequently, harvestable good quality grain from tassel-ears is rare.
For more photos, see my online article at http://www.kingcorn.org/news/timeless/TasselEars.html.