Eucalyptus jacksonii, commonly known as the red tingle, is a species of tall tree endemic to the southwest of Western Australia and is one of the tallest trees found in the state. It has thick, rough, stringy reddish bark from the base of the trunk to the thinnest branches, egg-shaped to lance-shaped adult leaves, flower buds in groups of seven, white flowers and shortened spherical to barrel-shaped fruit. Description Eucalyptus jacksonii is a tree that typically grows to a height of and has thick, rough, stringy and furrowed grey-brown or red-brown bark. The bases of very old, heavily buttressed trees can have a circumference up to . While some references have red tingle reaching heights of up to 75m, the tallest known living tree stands at tall. The crown is dense and compact, forming a heavy canopy. Young plants and coppice regrowth have broadly egg-shaped leaves that are dark green on the upper surface, paler below, long and wide. Adult leaves are arranged alternately, dark green on the upper surface, paler below, egg-shaped to lance-shaped, long and wide on a petiole long. The flower buds are arranged in leaf axils in groups of seven on an unbranched peduncle long, the individual buds on pedicels long. Mature buds are an elongated oval, long and wide with a conical operculum. Flowering occurs between January and March and the flowers are white. The fruit is a woody shortened spherical to barrel-shaped capsule long and wide on a pedicel long and with the valves enclosed below the level of the rim. The trees often have shallow root systems and grow a buttressed base. The heartwood is deep pink to reddish brown with a green-wood density of about , and air-dried density about . One specimen, known as the "Giant Tingle Tree" is a tourist attraction in the Walpole-Nornalup National Park near Walpole. Its base has been hollowed by fire and it is claimed to have the largest girth of any living eucalypt. The red tingle is often compared to the other two species - the yellow tingle (Eucalyptus guilfoylei) and Rate's tingle (Eucalyptus brevistylis) are smaller. The red tingle is more closely related to Rate's tingle, both of which belong to the subgenus Eucalyptus. Taxonomy and naming The species was first described by the botanist Joseph Maiden in 1914 in the Journal and Proceedings of the Royal Society of New South Wales. Eucalyptus jacksonii