4830 x 3620 px | 40,9 x 30,6 cm | 16,1 x 12,1 inches | 300dpi
Data acquisizione:
2008
Ubicazione:
Protection Island Georgia Strait BC British Columbia Canada North America
Altre informazioni:
In some areas of North America, common broom, introduced as an ornamental plant, has become naturalised and an invasive weed due to its aggressive seed dispersal; it has proved very difficult to eradicate. Similarly, it is a major problem species in the cooler and wetter areas of southern Australia and New Zealand. Biological control for broom in New Zealand has been investigated since the mid 1980s. On the west coast of the United States, French broom (Genista monspessulana) and Spanish broom (Spartium junceum) are also considered noxious invasives, as they are quickly crowding out native vegetation, and grow most prolifically in the least accessible areas. Brooms are a group of evergreen, semi-evergreen, and deciduous shrubs in 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.
