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Eucalyptus amplifolia subsp. sessiliflora


Cabbage gum

Eucalyptus amplifolia subsp. sessiliflora (Blakely) L.A.S.Johnson & K.D.Hill, Telopea 4: 52 (1990).

E. amplifolia var. sessiliflora Blakely, Key Eucalypts: 131 (1934). T: Acacia Creek, Macpherson Range, Dec. 1904, W. Dunn 47; holo: NSW.

Tree to 30 m tall. Forming a lignotuber.
Bark smooth throughout or with loose, greyish slabs persistent at base of trunk, smooth bark often becoming granular with age, white, grey, cream, brown or orange.
Juvenile growth (coppice or field seedlings to 50 cm): stem square in cross section, winged when young; juvenile leaves held conspicuously horizontal, soon alternate, petiolate, orbicular, ovate or deltoid, 4.5-16 cm long, 3.5-11 cm wide, margin entire, green and glossy.
Adult leaves alternate, petiole 1.5-3 cm long
; blade lanceolate to falcate, 7.5-22 cm long, 1.3-3.5 cm wide, base tapering evenly to petiole, margin entire, concolorous, glossy or dull, green, side-veins greater than 45° to midrib, moderately to densely reticulate, intramarginal vein parallel to and just within margin or well removed from it, oil glands mostly island.
Inflorescences axillary unbranched, peduncles 0.5-1.5 cm long; buds 9 to ?15, sessile, fusiform, ovoid, yellow or creamy, scar present, operculum conical to horn-shaped much longer than hypanthium, stamens erect, anthers cuboid to oblong, versatile, dorsifixed, dehiscing by longitudinal slits (non-confluent), style long, locules 3 or 4, the placentae each with 6 vertical ovule rows; flowers white.
Fruit sessile, hemispherical, 0.5-0.6 cm wide, disc raised, valves 3 or 4, strongly exserted.
Seed brown or blackish, 0.7-1 mm long, pyramidal or cuboid, dorsal surface pitted, hilum terminal.

Cultivated seedlings (measured at ca node 10): cotyledons reniform to oblong; stems squared in cross-section and winged; leaves sessile at lowest nodes but soon petiolate, opposite until nodes 4 to 6 then alternate, orbicular to deltoid, 7-10 cm long, 4-7 cm wide, base truncate to tapering, apex rounded or pointed, green, held horizontal.


NOTES

Eucalyptus amplifolia (Latin amplus, large, of the leaves).

A small to medium-sized red gum tree of subcoastal and tableland areas of New South Wales extending into Queensland. E. amplifolia belongs to the black, toothed, single-coated seed group. It is notable in the group for having large orbicular to deltoid, very glossy green juvenile leaves which are held, in the seedling, horizontally for more nodes than in the other red gums. It has buds with an elogated operculum but, unlike E. tereticornis , not dilated at the base.

There are two subspecies:

subsp. amplifolia
Occurs from the Nowra district north to the northern tablelands of New South Wales. It has pedicellate buds and fruit.

subsp. sessiliflora (Latin sessiliflora, flowers without stalks).
Has smaller buds and fruits than subsp. amplifolia, and they are usually more tightly clustered because the pedicel is very short or absent. It occurs from east of Armidale to east of Tenterfield in New South Wales and adjacent areas of far south-eastern Queensland.

Eucalyptus amplifolia belongs to Eucalyptus subgenus Symphyomyrtus section Exsertaria (red gums) series Erythroxylon because the bark is smooth, buds have two opercula, ovules are in 6 rows, seeds are pyramidal to cuboid and blackish, cotyledons are reniform to oblong, adult leaves are concolorous and the fruit have exserted valves. Series Erythroxylon has about 15 species occurring throughout eastern and central Australia.

USES

Honey.