Corolla. The flower-cup composed of one or more divisions called petals.

Petal. One of the divisions of the corolla.

Calyx. A flower-envelope, usually green, formed of several divisions called sepals, protecting the bud.

Sepal. One of the divisions of the calyx.

Anther. The pollen-bearing organ, usually yellow.

Filament. The stalk-like support of the anther.

Stamen. Anther and filament combined.

Ovary. The seed-bearing organ.

Ovary inferior. With the flower-parts growing from above the ovary.

Ovary superior. With the flower-parts growing from below the ovary.

Placenta. That particular portion of the ovary wall to which the ovules are attached.

Ovule. The body in the ovary which becomes a seed.

Style. The stalk-like projection proceeding from the ovary and terminated by the stigma.

Stigma. The generally sticky and sometimes branching termination of the pistil through which pollination takes place.

Pistil. Ovary, style, and stigma combined.

Regular Flower. Generally symmetrical and uniform in the number of its parts.

Perfect Flower. A flower complete in all the common parts.

Staminate. With stamens and without pistils.

Pistillate. With pistils and without stamens.

Polygamous. Pistillate, staminate, and perfect flowers, on the same or on different plants.

Claw. The narrow or stalk-like base of some petals.

Pedicel. The stalk of a flower in a cluster.

Raceme. A flower-cluster in which the flowers are borne along the flower-stalk on pedicels of nearly equal length.

Spike. A flower-cluster in which the flowers have no pedicels and are arranged more or less closely along the flower-stalk.

Bracts. Small scalelike formations.

Involucre. A circle of bracts below a flower-cluster.

Stipule. Small often leaflike formations, confined to the base of the leaf.

Capsule. A dry seed-vessel, composed of more than one part and splitting open.

Akene. A small dry one-seeded fruit, not splitting open.