Broom (shrub)

Broom
Common Broom, Cytisus scoparius
Scientific classification
Kingdom:	Plantae
Division:	Magnoliophyta
Class:	Magnoliopsida
Order:	Fabales
Family:	Fabaceae
Subfamily:	Faboideae
Tribe:	Genisteae
Genera [1]
Argyrocytisus: 1 species Chamaecytisus: 30 species Cytisus: about 30-35 species Genista: about 90 species Petteria: 1 species Podocytisus: 1 species Retama: 4 species Spartium: 1 species

Brooms are a group of evergreen, semi-evergreen, and deciduous shrubs.

All the brooms and their relatives (including Laburnum and Ulex) grow in Europe, north Africa and southwest Asia. The greatest diversity one can find in the Mediterranean region. Many brooms (though not all) are fire-climax species, adapted to regular stand-replacing fires which kill the above-ground parts of the plants, but create conditions for regrowth from the roots and also for germination of stored seeds in the soil.

The most familiar is common broom,^[2] that grows in northwestern Europe. One can find it in sunny sites, usually on dry, sandy soils. Like most brooms, it has apparently leafless stems that in spring and summer are covered with golden-yellow flowers. In late summer, its pea-pod like seed capsules burst open, often with an audible pop, spreading seed from the parent plant. It makes a shrub about 1–3m tall, rarely to 4m. It is also the hardiest broom, tolerating temperatures down to about -25 °C.

The brooms belong to the subfamily Faboideae of the legume family Fabaceae, mainly in the three genera Chamaecytisus, Cytisus and Genista, but also in five other small genera (see box, right). All genera in this group are from the tribe Genisteae (syn. Cytiseae). These genera are all closely related and share similar characteristics of dense, slender green stems and very small leaves, adaptations to dry growing conditions. Most of the species have yellow flowers, but a few have white, orange, red, pink or purple flowers.

1. ↑ ILDIS Version 6.05
2. ↑ (Cytisus scoparius, syn. Sarothamnus scoparius)