Acer forrestii Diels. Syn. Acer pectinatum ssp. forrestii Forrest's Maple Native to China, where it was discovered by George Forrest early this century. May grow to 12m (40ft) in its native environment. Flowers are open in May forming arched spikes up to 10cm (4in) long. The keys have wings 2.5cm (1in) long spread almost horizontally. Leaves have red stems, tufts of hair in axils beneath, and remain green in autumn. Bark is similar to other snake-barks, green with vertical white stripes. Z6.