Eucalyptus mannifera Mudie

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Credits

Article from New Trees, Ross Bayton & John Grimshaw

Recommended citation
'Eucalyptus mannifera' from the website Trees and Shrubs Online (treesandshrubsonline.org/articles/eucalyptus/eucalyptus-mannifera/). Accessed 2021-09-23.

Common Names

  • Mottled Gum
  • Brittle Gum

Glossary

strobilus
Cone. Used here to indicate male pollen-producing structure in conifers which may or may not be cone-shaped.
dbh
Diameter (of trunk) at breast height. Breast height is defined as 4.5 feet (1.37 m) above the ground.
glaucous
Grey-blue often from superficial layer of wax (bloom).
hypanthium
Cup-shaped or tubular structure at the base of a flower (‘floral cup’) formed by enlargement of the receptacle and/or the bases of the floral parts.
key
(of fruit) Vernacular English term for winged samaras (as in e.g. Acer Fraxinus Ulmus)
subspecies
(subsp.) Taxonomic rank for a group of organisms showing the principal characters of a species but with significant definable morphological differentiation. A subspecies occurs in populations that can occupy a distinct geographical range or habitat.

References

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Credits

Article from New Trees, Ross Bayton & John Grimshaw

Recommended citation
'Eucalyptus mannifera' from the website Trees and Shrubs Online (treesandshrubsonline.org/articles/eucalyptus/eucalyptus-mannifera/). Accessed 2021-09-23.

Tree to 25 m. Bark white, cream or grey, sometimes with red patches, smooth and powdery throughout. Branchlets greenish brown. Juvenile leaves alternate and petiolate, glaucous or not. Adult leaves dull blue- or greyish green, 6–25 × 0.8–3 cm, lanceolate, lateral veins indistinct, margins entire, apex acuminate; petiole terete or channelled, 0.6–2.7 cm long. Inflorescences solitary and axillary; umbellasters with seven flowers. Flower buds ovoid or rarely club-shaped; hypanthium 0.2–0.4 cm wide; stamens white or cream. Capsule hemispherical, ovoid or subglobular, 0.4–0.7 cm diameter; valves three, slightly exserted. Chippendale 1988. Distribution AUSTRALIA: New South Wales (east), Queensland (extreme southeast), Victoria (east). Habitat Open forest on hills and tablelands. USDA Hardiness Zone 8. Conservation status Not evaluated. Illustration NT324, NT347.

Chippendale (1988) recognised five subspecies of Eucalyptus mannifera, but Johnson & Hill (1990b) elevated two, subsp. elliptica and subsp. praecox, to full species status. A key to the remaining subspecies (modified from Chippendale 1988) is provided below.

1a.

Adult leaves ≤ 2 cm wide

2

1b.

Adult leaves ≥ 2 cm wide; Australia (southeastern New South Wales, eastern Victoria)

subsp. mannifera

2a.

Juvenile leaves glaucous; hypanthium hemispherical; Australia (southeastern New South Wales, eastern Victoria)

subsp. maculosa (R.T. Baker) L.A.S. Johnson

2b.

Juvenile leaves pale green; hypanthium conical; Australia (eastern New South Wales: Blue Mts.)

subsp. gullickii (R.T. Baker & H.G. Sm.) L.A.S. Johnson

The various currently recognised subspecies of E. mannifera are not well known in cultivation, although E. elliptica (see p. 339) is sometimes grown as E. mannifera subsp. elliptica. At Tresco in 2006 there was a 9 m specimen of subsp. gullickii recorded for TROBI, but this is the only example of the species to find its way into the register. At Logan there is a group of subsp. mannifera grown from Hind 5472, accessioned in 1989, that are approximately 12 m tall at the time of writing, the largest having a dbh of 25 cm. These have smooth, reddish brown bark which is unusual for this species, in which the bark is normally rather a striking white, or white with reddish patches. More horticultural exploration of Eucalyptus mannifera as a whole is needed, and the Gum Group has little experience of it. It should be noted, however, that in Australia it is notorious for shedding branches – hence the name Brittle Gum (Australian National Botanic Gardens 2003b).