- This class-designation has been recently proposed to give emphasis to the isolated position of the genus Ginkgo (Salisburia) among the Gymnosperms. Ginkgo biloba, the maidenhair tree, has usually been placed by botanists in the Taxeae in the neighbourhood of the yew (Taxes), but the proposal by Eichler in 1852 to institute a special family, the Salisburieae, indicated a recognition of the existence of special characteristics which distinguish the genus from other members of the Coniferae.
In 1797 Smith proposed to use the name Salisburia adiantifolia in preference to the " uncouth " genus Ginkgo and " incorrect " specific term biloba.
Maiden-hair Tree (Salisburia) - S. adiantifolia is a beautiful tree in all stages and at all seasons, perhaps most attractive during the autumn, just before the leaves drop, since the foliage assumes then a bright yellow hue.
It is not clearly allied to any other known tree, and seems, like the Salisburia, to be a last trace of some long-past geological period.