These are small, united bracts, which form a cup-like involucre.

Each head has an involucre of phyllaries shaped like a top.

The nut falls out of the involucre when ripe, about 7-8 months after pollination.

In general, an involucre is a covering.

At its base is a fused involucre of bracts.

Dogwoods; about 20-30 species of shrubs; flower clusters without an involucre.

The whorl of bracts beneath the inflorescences is called involucre.

Each involucre slightly incloses a small oval nut.

Their upper tips are free and in the beginning cover the opening of the involucre (like the shutter of a camera).

Usually six flowers bloom in a bell-shaped involucre of five partly fused bracts.

The involucre are campanulate shaped and 5-6 mm wide, composed of five flowers.

The flowers are held in a bowl-shaped involucre of bracts with toothed edges.

Five to nine flowers bloom from a cup-shaped involucre of several partly fused bracts.

Around the disc is an involucre of modified leaves, the bracts, which are petal-like, stiff and papery.

Bracts that appear in a whorl subtending an inflorescence are collectively called an involucre.

The pseudanthium has a whorl of bracts below the flowers, forming an involucre.

Each head has a bullet-shaped involucre lined with woolly, purple-tipped phyllaries.

Staminate heads have many flowers and are 3 to 5 mm in diameter with a 5 to 8 lobed involucre.

The fruit of hickory is pear shaped and enclosed in a thin husk developed from the floral involucre.

A set of bracts forms an involucre surrounding the base of the capitulum.

These bracts have hemispherical involucre or coverings.

The phyllaries, which are the small leaves that make up the involucre, number from 25 to 30 and are arranged in 4 to 5 series.

The involucre is ovate to lanceolate in shape and sericeous.

A vicid gum resin flows from the involucre.

The species within this genus can vary extensively in their habit, leaf division, involucre, receptacle and achenes.