orthogamy

from The Century Dictionary.

• noun In botany, direct or immediate fertilization, without the intervention of any mediate agency.

from the GNU version of the Collaborative International Dictionary of English.

• noun (Bot.) Direct fertilization in plants, as when the pollen fertilizing the ovules comes from the stamens of the same blossom; -- opposed to heterogamy.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

• noun botany fertilization of the ovules of a plant by pollen from the same plant