|Veteran scribbly gum showing scribbles and possum tracks, North Sydney, Australia|
Eucalyptus micrantha DC.
Eucalyptus racemosa, known as the scribbly gum or snappy gum, is a tree native to eastern Australia. An alternative name is narrow leaved scribbly gum, as the leaves are different from the related Eucalyptus haemastoma, a similar and better known tree.
A small to medium-sized tree, up to 20 metres tall. Smooth barked throughout in white, grey or yellow, shed in short ribbons. Distinctive scribbles often found on the bark, caused by the scribbly gum moth (genus Ogmograptis).
Adult leaves 7 to 20 cm long, 1 to 3.5 cm wide, alternate, petiolate with petiole 1 to 2.5 cm long, dull greyish green on both sides of the leaf. Lanceolate to narrow-lanceolate, some falcate, basally-tapered and with obscure acute lateral veins. Intermediate leaves opposite for 3-6 nodes then alternate, broad-lanceolate to falcate. Inflorescence axially in leaf junction but sometimes terminal, 7 to 15 buds per umbel with pedicels 0.3 to 0.6 cm long. Buds obovoid 0.3 to 0.5 cm long, 0.2 to 0.3 cm wide, peduncles flattened or angular, 0.7 to 1.2 cm long. White flowers have been recorded in January and February, and between July and September.
Fruit cup-shaped, obconical or hemispherical 0.3 to 0.6 cm long, 0.4 to 0.7 cm wide, reddish-brown. Disc raised (convex) or level, valves 3 to 4, enclosed or rim-level. Seeds brown to reddish-brown, 1.2 to 2 mm long, pyramidal or obliquely-pyramidal.
The species was fist formally described by the botanist Antonio José Cavanilles in 1797 as part of the work Icones et Descriptiones Plantarum. Various synonyms exit for the species including Eucalyptus micrantha as described by de Candolle in 1828 in Myrtaceae. Prodromus Systematis Naturalis Regni Vegetabilis and Eucalyptus haemastoma var. sclerophylla by William Blakely in 1934 in A Key to the Eucalypts and Eucalyptus haemastoma var. capitata by Joseph Maiden in 1908 in A Critical Revision of the Genus Eucalyptus.
It is found as part of woodland areas where it is usually the dominant species on poor sandstone soils in mid to high rainfall areas. Restricted and localised around Sydney. It ranges south from Pokolbin, east of the Great Dividing Range.
- Horak, M.; Day, M.; Edwards, T.; Barlow, C.; Su, Y. N.; Cameron, S. "Scriibly gum moths". csiropedia.csiro.au. CSIRO. Retrieved 30 December 2017.
- "EucaLink - Eucalyptus racemosa". plantnet.rbgsyd.nsw.gov.au. Royal Botanic Gardens Sydney. Retrieved 31 December 2017.
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- "Eucalyptus racemosa – Narrow-leaved Scribbly Gum / Snappy Gum" (PDF). Hornsby Shire Council. Retrieved 31 December 2017.
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- Brooker & Kleinig. A Field Guide to Eucalypts. 1. p. 126. ISBN 0-909605-62-9.