Flame Bottle Tree Identification Guide

Key Identifying Features

The flame bottle tree (Brachychiton acerifolius), also called the Illawarra flame tree, is an Australian tree celebrated for a dramatic display of brilliant scarlet-red bell flowers that smother the bare branches in early summer. It belongs to the bottle tree group, and mature trees may show a slightly swollen, bottle-like trunk base.

• Masses of small, bright red, bell-shaped flowers on leafless branches
• Maple-like (acerifolius = maple-leaved) lobed glossy leaves when in foliage
• Dark brown, boat-shaped woody seed pods with irritating hairs and yellow seeds inside
• Smooth greenish-gray bark, sometimes a thickened trunk

Leaves & Stems

Leaves are alternate, simple, glossy dark green, and variable: on younger or vigorous growth they are deeply 3-7 lobed like a maple leaf, while on older branches some are entire and lance-shaped - this variability is characteristic. Leaves are 4-10 in across. The tree is briefly deciduous, shedding foliage in the area that will flower. Bark is smooth and green-gray; trunks can become buttressed or slightly swollen with age.

Flowers & Fruit

In late spring to summer, the tree produces loose panicles of waxy, scarlet-red, bell-shaped flowers about 0.75 in across, each with five lobes - there are no true petals; the color comes from the calyx. Flowering is famously erratic, with parts of the tree or only some years blooming heavily. The fruit is a dark brown, leathery, boat-shaped follicle 3-4 in long, holding rows of yellow seeds surrounded by fine irritating bristles - handle pods with care.

How to Tell It Apart from Look-Alikes

• Queensland bottle tree (Brachychiton rupestris): has a dramatically swollen bottle trunk but small creamy flowers and narrow leaves - much fatter trunk, no red flame display.
• Kurrajong (Brachychiton populneus): similar boat pods but cream bell flowers and poplar-like leaves.
• Royal poinciana / flame tree (Delonix regia): also fiery red, but has large showy petalled flowers and ferny bipinnate leaves - very different foliage.
• Coral tree (Erythrina): red flowers but pea-shaped and trifoliate leaves with thorns.

The scarlet bell flowers on bare branches + variable maple-like glossy leaves + boat-shaped follicles confirm flame bottle tree.

Where You'll Find It

Native to subtropical eastern Australia (rainforest margins), it is widely planted as a street and feature tree in frost-free to light-frost climates (USDA zones 9b-11), including Australia, California, and the Mediterranean. Look for it as a tall specimen flaring red against the summer sky.

Quick ID Checklist

• Bright scarlet, bell-shaped flowers on leafless branches in summer
• Glossy, variable maple-like lobed leaves
• Boat-shaped dark-brown woody pods with irritating hairs
• Smooth green-gray bark; trunk may be slightly swollen
• Briefly deciduous; erratic flowering
• Warm, frost-free climate