Betula albosinensis Betula albosinensis Betula albosinensis, the "'Chinese red birch"), syn. "B. bhojpattra" var. "sinensis", "B. utilis" var. "sinensis", is a species of birch in the family Betulaceae, native to Western China. It is a deciduous tree growing to . A particular feature is the peeling brown bark (cream when newly exposed). In fact the Latin specific name "albosinensis" means "white, from China". Brown catkins are produced in Spring. "Betula albosinensis" is grown as an ornamental tree for parks and large gardens, and numerous cultivars have been produced. The cultivars 'China Rose' and 'Red Panda' have gained the Royal Horticultural Society's Award
Alnus viridis Alnus viridis Alnus viridis (green alder) is an alder distributed widely across the cooler parts of the Northern Hemisphere. It is a large shrub or small tree 3–12 m tall with smooth grey bark even in old age. The leaves are shiny green with light green undersurfaces, ovoid, 3–8 cm long and 2–6 cm broad. The flowers are catkins, appearing late in spring after the leaves emerge (unlike other alders which flower before leafing out); the male catkins are pendulous, 4–8 cm long, the female catkins 1 cm long and 0.7 cm broad when mature in late autumn, in clusters