Representing a greatly enlarged idealized complete
flower, this non-breakable vinyl model teaches the reproduction function of flowers,
angiosperm pollination, and fertilization. It incorporates all four floral series:
the sterile calyx (sepals) and corolla (petals); the fertile androecium (stamens) and
gynoecium (pistil). Three petals, four sepals and four stamens are detachable.
Two anthers are sectioned open to expose pollen grains. The ovary is
dissected to reveal the 7-celled female gametophyte.
Pollination is demonstrated by six pollen grains which
have adhered to the stigma. One of them has generated a pollen tube which has
penetrated the micropyle. Depicting the condition just prior to double
fertilization, the tube nucleus, closely followed by the two sperm cells, can be observed
near the apex of the pollen tube. One sperm is destined to fertilize the two polar
nuclei, forming the nutritive triploid endosperm. The other will fertilize the egg
to form the diploid zygote.
Twenty-seven hand-coded structures are identified in the
accompanying key. Overall dimensions are 17 x 14 x 10 inches (43 x 36 x 25 cm).
Manufactured in the U.S.A. by Denoyer-Geppert.