home | glossary | about eucalypts | about EUCLID | browse species

Eucalyptus agglomerata


Blue-leaved stringybark


Eucalyptus agglomerata Maiden, J. & Proc. Roy. Soc. New South Wales 55: 266 (1922).

T: Hill Top, N.S.W., Jan. 1896, J.H. Maiden s.n.; holo: NSW.

E. subcaerulea K.D.Hill, Telopea 7: 195 (1997). T: New South Wales: Northern Tablelands: Cooraldooral trig., Gibralter Range State Forest, 28 Oct. 1996, K.D.Hill 4889 & P.G.Richards; holo: NSW; iso: AD, BRI, CANB, HO, K, L, MEL, MO.


Tree to 40 m tall. Forming a lignotuber.
Bark rough to small branches, stringy or fibrous, dark grey or grey-brown.
Juvenile growth (coppice or field seedlings to 50 cm): stem rounded in cross-section, scabrid at first, becoming smooth; juvenile leaves petiolate, opposite, conspicuously undulate and discolorous for 3 to 6 pairs, initially scabrid-hairy above and below but soon smooth above and scabrid only on margins and midrib, becoming glabrous, alternate, ovate, 3.5-11 cm long, 2-5 cm wide, margin entire, glossy, green.
Crown usually blue-green.
Adult leaves alternate, petiole 0.6-1.8 cm long; blade lanceolate to falcate, 7-14 cm long, 1.4-3 cm wide, base oblique or tapering evenly to petiole, margin entire, concolorous or slightly discolorous, glossy, green to blue-green,
side-veins acute, sparsely to moderately reticulate, intramarginal vein parallel to and just within margin or well removed from it, oil glands island.
Inflorescences axillary unbranched, peduncles 0.4-1.5 cm long; buds 11 to 15, pedicellate or sessile, fusiform to diamond-shaped, green to yellow, smooth or scurfy, scar absent, operculum conical, stamens irregularly flexed, anthers reniform to cordate, versatile, dorsifixed, dehiscing by confluent slits, style long, locules 3 or 4, the placentae each with 2 vertical ovule rows; flowers white or cream.
Fruit sessile, compressed-hemispherical with sides deformed by crowding, 0.5-1 cm wide (and usually broader than long), disc raised or level, valves 3 or 4, near rim level or enclosed.
Seed black or brown, 1.5-2.5 mm long, pyramidal or obliquely pyramidal, dorsal surface smooth or shallowly pitted, hilum terminal.

Cultivated seedlings (measured at ca node 10): cotyledons reniform; stems rounded in cross-section, densely stellate-hairy; leaves always petiolate, opposite for 3 to 6 nodes then alternate, ovate, 6-11 cm long, 3.5-7 cm wide, base rounded or tapering, margin irregular and conspicuously undulate, slightly discolorous, green glossy, stellate-hairy.


NOTES

Eucalyptus agglomerata (Latin agglomeratus, collected in a head, of the fruits).

A small to medium-sized stringybark tree of eastern Victoria and coastal and subcoastal New South Wales, north to Correbare State Forest.

E. agglomerata is notable for the bluish green canopy although the individual leaves are glossy green on inspection. Another stringybark with a similar-coloured crown but much less abundant is E. mackintii which is endemic to eastern Victoria. The fruits of E. agglomerata, unlike those of E. mackintii , are crowded and flattened along their sides through compression. The leaves are prominently glandular contrasting with those of E. mackintii which can be almost devoid of oil glands. E. tindaliae is another stringybark with a bluish crown but never has crowded fruit and occurs well north of E. agglomerata. E. blaxlandii , another stringybark from the Central and Southern tablelands of New South Wales, can be distinguished from E. agglomerata by its smooth branches, green crown and less-compressed fruit.

Eucalyptus agglomerata belongs to Eucalyptus subgenus Eucalyptus section Capillulus series Pachyphloius (the stringybarks), being trees with coarsely fibrous, stringy bark, shortly emergent oil glands with obvious radiating hairs on stems and lower leaves of seedlings and juvenile growth, axillary inflorescences with buds having only one operculum and reniform anthers
, ovules are in 2 rows, and ± pyramidal seeds.

In general many stringybarks are difficult to identify to species with certainty. In this edition of EUCLID we recognize 26 species in southern Australia. The stringybarks can be divided into 5 groups as follows -

1. Buds pedicellate, clavate - E. muelleriana , E. laevopinea .

2. Buds pedicellate, operculum beaked - E. macrorhyncha subsp. macrorhyncha and E. macrorhyncha subsp. cannonii.

3. Buds more or less sessile, angular longitudinally - E. mackintii , E. williamsiana , E. boliviana , E. youmanii , E. capitellata , E. camfieldii , E. bensonii.

4. Buds with tapering pedicels or sessile, fusiform to narrowly ovoid - E. cameronii , E. globoidea , E. caliginosa , E. eugenioides , E. sparsifolia , E. tenella , E. mckieana , E. ligustrina , E. tindaliae , E. agglomerata.

5. Buds more or less sessile, opercula flat to obtuse or rarely acute - E. baxteri , E. blaxlandii , E. imitans , E. verrucata , E. serraensis .

Eucalyptus arenacea is a somewhat anomolous stringybark as its buds are pedicellate and more or less clavate, and on the above criteria, may be placed in group 1 but it is widely regarded as being close to E. baxteri
of group 5.

USES

General building construction, fencing and honey.