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Anatomy of an Alien Invader
Leucaena leucocephala (a.k.a. koa haole) is an extremely invasive species. It quickly colonizes bare ground and forms a monoculture that shades out other plants. It is a member of the Fabaceae and has a Legume for its fruit. The anatomy of its flower is instructive, however, and it is exclusively available here for your intellectual gratification! It is similar to Acacia koa!
 Foliage, Flowers and Fruits of Leucaena |
 Longitudinal Section of Leucaena Flower Buds |
 Flower Cross Section at the Level of the Filaments & Style Note the sequence of Flower Organs. |
 Flower Cross Section at the Level of the Filaments & Style Note the Vasculature of the various structures. |
 Flower Cross Section at the Level of the Ovary Note the Ovule. |
 Leucaena Ovule |
 Two Integuments are produced by the Ovule. These enclose it except for a small opening called the Micropyle. |
 The location of the future Micropyle is indicated in this image. |
 The Nucellus is diploid tissue. It produces the Megagametophte (Embryo Sac). |
 Note the Immature Embryo Sac with free nuclei. |
Longitudinal Sections through the Gynoecium of Leucaena |
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 Label the Flower Parts in this Cross Section!!! |
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