What is Broom (shrub)?
{{Taxobox | name = Broom | image = Cytisus scoparius3.jpg | image_width = 250px | image_caption = [[Cytisus scoparius|Common Broom]], ''Cytisus scoparius'' | regnum = [[Plant]]ae | divisio = [[Flowering plant|Magnoliophyta]] | classis = [[Dicotyledon|Magnoliopsida]] | ordo = [[Fabales]] | familia = [[Fabaceae]] | subfamilia = [[Faboideae]] | tribus = [[Genisteae]] | subdivision_ranks = Genera <ref>[http://www.ildis.org/ ILDIS Version 6.05]</ref> | subdivision = *''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]] [[shrub]]s. 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''',<ref>(''[[Cytisus scoparius]]'', syn. ''Sarothamnus scoparius'')</ref> 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&nbsp;°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 [[Genus|ge