Brachychiton rupestris is a tree in the family Malvaceae native to Queensland, Australia. Reaching 10–25 metres high, the Queensland bottle tree is deciduous. Cream-coloured flowers appear from September to November, and are followed by woody boat-shaped follicles that ripen from November to May.
About Brachychiton rupestris in brief
Brachychiton rupestris is a tree in the family Malvaceae native to Queensland, Australia. Discovered and described by Sir Thomas Mitchell and John Lindley in 1848, it gained its name from its bulbous trunk. Reaching 10–25 metres high, the Queensland bottle tree is deciduous, losing its leaves between September and December. Cream-coloured flowers appear from September to November, and are followed by woody boat-shaped follicles that ripen from November to May. As a drought-deciduous succulent tree, B. r upestris adapts readily to cultivation and is tolerant of a range of soils and temperatures. It is a key component of the endangered central semi-evergreen vine thickets—also known as bottletree scrub—of the Queensland Brigalow Belt. Remnant trees are often left by farmers on cleared land for their value as shade and fodder trees. The species is closely related to the Proserpine bottle tree, which can be distinguished by its more oval leaves, more compact flower heads and longer ellipsoid heads. The Orescmeau bottle tree has brighter, undescribed lime-green new foliage and leaves but is otherwise similar to the proserpine tree, otherwise known as the exotesta bottle tree.
No subspecies are recognised. The thick trunk is 5–15 metres tall, with a 1–3. 5 metres diameter at breast height. It has dark grey bark and is marked by shallow tessellation and deeper fissures. The adult leaf blades are 4–11 centimetres long and 0. 8–2 centimetre wide with pointed tips. The compound juvenile leaves have 3–9 spear-shaped or linear lobes. The length of the perianth is more than half the peranth diameter. The hairy, split seeds develop from 8 to 8 millimetres in length to reveal a smooth surface, covered by a hairy coating by 3–5 millimetre wide by 5 millimetRES. The follicles, smooth on the outer surface and inside, cover the seeds, which are 6–7 millimetrefs long by 3 millimetrests wide. The male flowers have 15 stamens, with pale yellow anthers, while female flowers have cream or white stigmas surrounded by rudimentary stellate carpels.