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Pollination and fertilization of one flower by another on the same plant.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.
The following article is from The Great Soviet Encyclopedia (1979). It might be outdated or ideologically biased.



cross-pollination within the same plant as a result of the transfer of pollen by insects or by the wind from one flower to another. Geitonogamy is known to occur, for instance, among carrots during their flowering when flies crawl over the entire raceme and transfer the pollen picked up on one flower to the stigma of the pistil of another. Occasionally certain plants (toadflax, for example) do not produce seeds in geitonogamy.

The Great Soviet Encyclopedia, 3rd Edition (1970-1979). © 2010 The Gale Group, Inc. All rights reserved.
References in periodicals archive ?
Reusch, "Fitness-consequences of geitonogamous selfing in a clonal marine angiosperm (Zostera marina)" Journal of Evolutionary Biology, vol.
In addition, qualitative differences in floral shape among clones was used to ensure that geitonogamous pollinations were prevented.
These single-branch plants have no opportunity for between-branch geitonogamy and should, therefore, experience less geitonogamous selfing than plants with multiple flowering branches, which had 5.4 [plus or minus] 4.8 other flowering branches (weighted mean [plus or minus] 1 SD), which bore a mean of 16.0 [plus or minus] 15.3 open flowers/d.
This may result in a limit to geitonogamous pollen transfers and long distance pollen flow (Dressler 1981).
In the Faroes Islands, Hagerup (1951) indicated that species with large inflorescences tended to be geitonogamous. However, Lloyd (1992) also pointed out that most cosexual SC species may be unable to avoid mixed mating--as would most likely occur in all of the SC hummingbird-pollinated species on the Juan Fernandez Islands.
Although pollinator exclusion by bagging virtually eliminated fruit and seed production, geitonogamous crosses (within plants, between flowers) produced normal fruit set [ILLUSTRATION FOR FIGURE 2 OMITTED].
One explanation for this pattern is that clipped plants may experience an increase in within-plant pollinator movement and associated geitonogamous pollen transfer (see Juenger and Bergelson [1997] for additional alternative hypotheses).
Pollinator behaviour often varies in different sized plants, with relatively more geitonogamous pollinations in larger plants (Dudash 1991).
For those orchids in which small [delta] values lead to geitonogamous pollination, the number of pollinaria removed may not be an accurate estimate of pollen export.
Among these genera, the mating system is known only for Bidens, where Sun and Ganders (1988) estimated that selfing occurred at a rate of 43% averaged over 15 populations of 11 species, due primarily to geitonogamous matings of hermaphrodites.
A likely consequence of this foraging behavior is a high level of self-pollination (whether autogamous or geitonogamous, Gomez and Zamora 1996), a common feature noted for other mass-flowering species (Augspurger 1980, Stephenson 1982, Frankie and Haber 1983, Harder and Barrett 1995, Snow et al.