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Eucalyptus archeri


Alpine cider gum

Eucalyptus archeri Maiden & Blakely, Crit. Revis. Eucalyptus 8: 58 (1929).

T: Western Mts, Tas., Jan. 1848, W.H.Archer; holo: NSW; iso: CANB.

Small tree or mallee to 12 m tall. Forming a lignotuber.
Bark smooth, grey-green, grey, pinkish, white or brown, sometimes with horizontal black scars.
Juvenile growth (coppice or field seedlings to 50 cm): stem rounded or square in cross-section, warty or smooth; juvenile leaves opposite, sessile and orbicular for at least 25 nodes, becoming alternate, petiolate, orbicular to ovate, 1.3-3.9 cm long, 0.9-3.2 cm wide, margin crenulate or entire, green or grey-green (only tip growth and newly expanded juvenile leaves glaucous).
Adult leaves alternate, petiole 0.8-2.2 cm long; blade lanceolate to elliptical, 4-9 cm long, 0.9-3 cm wide, flat (rarely undulate), base tapering evenly to petiole, margin entire, concolorous or slightly discolorous, glossy, green to grey-green,
side-veins greater than 45° to midrib, densely to very densely reticulate, intramarginal vein parallel to and well removed from margin, oil glands scattered, intersectional.
Inflorescences axillary unbranched, peduncles 0.1-0.7 cm long; buds 3, shortly pedicellate or sessile (often only central bud pedicellate), oblong to ovoid to clavate, green, usually slightly angular, scar present, operculum conical, rounded or slightly beaked, stamens inflexed, anthers cuboid to oblong, versatile, dorsifixed, dehiscing by longitudinal slits (non-confluent), style short or long, locules 3 or 4, the placentae each with 4 vertical ovule rows (sometimes with an incomplete fifth row); flowers white.
Fruit sessile to shortly pedicellate, cylindrical, barrel-shaped, obconical or hemispherical, 0.5-0.8 cm wide, disc descending, valves 3 or 4, near rim level or enclosed.
Seed dark brown or blackish, 1.2-2 mm long, ovoid or flattened-ovoid, often pointed at one end, usually lacunose, dorsal surface smooth or shallowly pitted, hilum ventral.

Cultivated seedlings (measured at ca node 10): cotyledons bilobed; stems usually squared in cross-section, sometimes slightly winged, often slightly warty; leaves opposite and sessile for many nodes, orbicular to ovate, 1.5-2.7 cm long, 1.2-2.5 cm wide, base amplexicaul to rounded, apex rounded, glaucous weathering to green.


NOTES

Eucalyptus archeri (after William H. Archer, 1829-1874. For some years Archer was secretary of the Royal Society of Tasmania, as well as being a fellow of the Royal Society and the Linnean Society. He was a keen collector of botanical specimens and in 1848 collected specimens from the Western Mountains of Tasmania which eventually became the type material for the name Eucalyptus archeri).

A small tree endemic to Tasmania, E. archeri is distinguished from the related E. gunnii which has glaucous buds and fruits. From other 3-budded species in Tasmania it is distinguished by the combination of cupular fruit and orbicular to cordate juvenile leaves.

Eucalyptus archeri belongs in Eucalyptus subgenus Symphyomyrtus section Maidenaria, a large group of species more or less restricted to south-eastern Australia, characterized by bilobed cotyledons, simple axillary inflorescences, buds with two opercula, stamens with versatile anthers and flattened seeds with a ventral hilum. Within this section, E. archeri, with 9 other species, forms series Orbiculares having orbicular to cordate juvenile leaves opposite for many nodes, a grey-green to green crown, and buds in 3s. Series Orbiculares is confined to far south-eastern New South Wales, eastern Victoria and Tasmania.