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Rhamnaceae

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Kingdom  Plantae
Higher classification  Rosales
Order  Rosales
Scientific name  Rhamnaceae
Rank  Family
Rhamnaceae Flowering Plant Families UH Botany
Lower classifications  Buckthorn, Jujube, Frangula alnus, California lilac, Rhamnus cathartica

Trees with don leopold european buckthorn


The Rhamnaceae are a large family of flowering plants, mostly trees, shrubs, and some vines, commonly called the buckthorn family.

Contents

Rhamnaceae Family Rhamnaceae buckthorn family Go Botany

The family contains about 55 genera and 950 species. The Rhamnaceae have a worldwide distribution, but are more common in the subtropical and tropical regions. The earliest fossil evidence of Rhamnaceae is from the Eocene.

Rhamnaceae Flowering Plant Families UH Botany

Leaves of Rhamnaceae family members are simple, i.e., the leaf blades are not divided into smaller leaflets. Leaves can be either alternate and spiraling, or opposite. Stipules are present. These leaves are modified into spines in many genera, in some (e.g. Paliurus spina-christi and Colletia cruciata) spectacularly so. Colletia stands out by having two axillary buds instead of one, one developing into a thorn, the other one into a shoot.

Rhamnaceae RHAMNACEAE Buckthorn Family

The flowers are radially symmetrical. There are 5 (sometimes 4) separate sepals and 5 (sometimes 4 or none) separate petals. The petals may be white, yellowish, greenish, pink or blue, and are small and inconspicuous in most genera, though in some (e.g. Ceanothus) the dense clusters of flowers are conspicuous. The 5 or 4 stamens are opposite the petals. The ovary is superior, with 2 or 3 ovules (or one by abortion).

Rhamnaceae httpsuploadwikimediaorgwikipediacommonsthu

The fruits are mostly berries, fleshy drupes, or nuts. Some are adapted to wind carriage, but most are dispersed by mammals and birds. Chinese jujube is the fruit of the jujube tree (Ziziphus zizyphus) and is a major fruit in China.

Rhamnaceae Flowering Plant Families UH Botany

The American genus Ceanothus, which has several showy ornamental species, has nitrogen-fixing root nodules.

Economic uses of the Rhamnaceae are chiefly as ornamental plants and as the source of many brilliant green and yellow dyes. The wood of Rhamnus was also the most favoured species to make charcoal for use in gunpowder before the development of modern propellants.

Frangula alnus rhamnaceae


Systematics

Modern molecular phylogenetics recommend the following clade-based classification of Rhamnaceae:

References

Rhamnaceae Wikipedia


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