Angiosperms FLOWERING

Complete have , a pistil, , and .

Stigma (receives the during fertilization) Anther (contains pollen, the male reproductive cell) Pistil ( reproductive Filament Stamen ) (holds the anther) (reproductive cell which will become the when fertilized by pollen)

Stamens: Male Reproductive Organs Pistils: Female Reproductive Organs A stamen consists of an anther (which produces The pistil includes an ovary (where the are pollen, the male reproductive cell) and a filament. produced; ovules are the female reproductive cells, the eggs), and a (which receives the pollen during fertilization).

Fertilization is often aided by like , which from to flower; as they visit flowers, they spread pollen and deposit it on the stigmas. After pollen grains have landed on the stigma, pollen tubes develop, and burrow down into the ovary, there the pollen ( cell) fertilizes an ovule (). After fertilization, the ovule develops into a seed.

In contrast to the idealized diagram above flowers actually are quite varied in appearance. Petals come in a wide variety of shapes and sizes, some “petals” are actually . (Some types of flowers have both male and female reproductive organs (as shown above), others have only male or only female reproductive organs.)

Poinsettia Lily Primrose

female The colorful, showy The is really This lily has both male are actually a cluster of small and female parts. It is modified leaves. The flowers. The showy comparable to the true flowers are outer flowers, which idealized flower and held in the look like petals, are diagram above. center of the bracts in called rays. The fertile a structure called a disc flowers grow in . the middle. male Primroses have dimorphic flowers: two different forms (male or female) are found on different plants of the same species.

Created by: Conservatory Education Committee, 2006 Materials donated by the School of Education, University of Puget Sound