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Rhododendrons are stunning horticultural plants widely cultivated in temperate regions. In the wild they are mainly associated with centres of diversity in the Himalayas and in South East Asia, where they form important components of montane ecosystems.

Maples are keystone species in northern temperate forests and are much valued as a source of revenue for products such as maple syrup and timber.

The Red List of the Magnoliaceae, published jointly by Botanic Gardens Conservation International (BGCI) and Fauna & Flora International (FFI), through the Global Trees Campaign (GTC), identifies 131 wild magnolias as being in danger of extinction, from a global total of 245 species.

The Red List of Endemic Trees and Shrubs of Ethiopia and Eritrea, published by the Global Trees Campaign in 2005, helps to improve the sparse knowledge of trees in the area.