Eucalyptus macrocarpa Hook., Myrtaceae

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Present on Pacific Islands?  no

Primarily a threat at high elevations?  no

Risk assessment results:  Evaluate, score: 3 (Go to the risk assessment)

Common name(s): [more details]

English: mottlecah

Habit:  tree

Description: 

subsp. elachantha: "Mallees to 3 m tall. Forming a lignotuber. Bark smooth throughout, shiny yellowish brown and grey-brown, shedding in short ribbons. Branchlets glaucous; lacking oil glands in the pith. Juvenile growth (coppice or field seedlings to 50 cm): stems square or rounded in cross-section, glaucous. Crown formed of juvenile leaves which are typically opposite, sessile, amplexicaul, cordate to oblong, 5.5-8.5 cm long, 3.5-5 cm wide, margin entire, rarely subcrenulate, apex usually rounded to acute, rarely emarginate, concolorous, dull, pale whitish grey due to copious surface wax, side-veins greater than 45° to midrib, densely reticulate, intramarginal vein remote from margin, oil glands moderately numerous, intersectional. Inflorescences axillary unbranched, peduncles 0.1-0.7 cm long; bud solitary, sessile or shortly and stoutly pedicellate, pedicels 0-0.5 cm long. Mature buds ovoid (4-5.5 cm long, 2.5-3 cm wide), glaucous, finely ribbed longitudinally to smooth, scar present, operculum beaked (3.2-3.8 cm long), outer stamens oblique, some inner stamens inflexed, filaments red (rarely creamy white), anthers cuboid, yellow, dorsifixed, dehiscing by longitudinal slits, style long and more or less straight, stigma blunt, locules 4 or 5, the placentae each with 8 or 10 vertical rows of ovules, with a narrow central gap. Flowers red rarely creamy white. Fruit sessile, broadly and shallowly obconical, 1.2-2 cm long, 3.3-4.5 cm wide, disc slightly to steeply raised, oblique, valves 4 or 5, exserted. Seed pale straw-brown to pale grey-brown, 3-6 mm long, more or less pyramidal with prominent ridges and a conspicuous encircling marginal flange ca 1 mm wide, dorsal surface smooth to shallowly reticulate, hilum terminal"  (EUCLID:  Eucalypts of Australia).

Habitat/ecology:  In Western Australia (native), "usually on sand plain"  (EUCLID:  Eucalypts of Australia).

Propagation:  Seed

Native range:  Southwestern Western Australia; also cultivated (GRIN).

Presence:

Pacific Rim
Country/Terr./St. & Island group	Location	Cited status & Cited as invasive & Cited as cultivated & Cited as aboriginal introduction?	Reference & Comments
Australia Australia (continental)	Australia (continental)	native	U.S. Dept. Agr., Agr. Res. Serv. (2011) Southwestern Western Australia

Additional information:
Information for the Australian Native Plants Society.
Information from FloraBase:  The Flora of Western Australia.

Additional online information about Eucalyptus macrocarpa is available from the Hawaiian Ecosystems at Risk project (HEAR).

Information about Eucalyptus macrocarpa as a weed (worldwide references) may be available from the Global Compendium of Weeds (GCW).

Taxonomic information about Eucalyptus macrocarpa may be available from the Germplasm Resources Information Network (GRIN).

References:

U.S. Dept. Agr., Agr. Res. Serv. 2011. National Genetic Resources Program. Germplasm Resources Information Network (GRIN). Online searchable database.