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Eucalyptus alligatrix subsp. miscella



Eucalyptus alligatrix subsp. miscella Brooker, Slee & J.D.Briggs, Austral. Syst. Bot. 8: 512 (1995).

T: New South Wales: "Coomber" Farm, SW of Rylstone, 24 Aug. 1992, M.I.H. Brooker 11147; holo: CANB; iso: BRI, MEL, NSW.


Tree to 15 m tall. Forming a lignotuber.
Bark rough to small branches or rarely the branches <8cm diam. smooth, rough bark thick, fibrous, coarsely furrowed down trunk, grey; branchlets rarely glaucous.
Juvenile growth (coppice or field seedlings to 50 cm): stem rounded or square in cross-section, usually glaucous; juvenile leaves always opposite, sessile, orbicular to ovate, 2-4.5 cm long, 2.5-5 cm wide, margin entire or crenulate, green to grey-green or glaucous.
Crown composed entirely of adult leaves which are alternate, petiole 1-2 cm long; blade lanceolate, 8-17 cm long, 0.8-2.8 cm wide, base tapering to petiole, margin entire, concolorous, glossy, green to grey-green,
side-veins greater than 45° to midrib, moderately to densely reticulate, intramarginal vein parallel to and just within margin, oil glands mostly island.
Inflorescences axillary unbranched, peduncles 0.4-1 cm long; buds 3 or 7, pedicellate or rarely sessile, diamond-shaped, slightly glaucous or green, scar present, operculum conical, stamens inflexed, anthers cuboid or cuneate, versatile, dorsifixed, dehiscing by longitudinal slits (non-confluent), style long, locules 3 or 4, the placentae each with 4 vertical ovule rows; flowers white.
Fruit pedicellate or sessile, obconical or campanulate, 0.5-0.6 cm wide, disc raised, valves 3 or 4, strongly exserted.
Seed brown, 1-1.5 mm long, ovoid or flattened-ovoid, usually lacunose, dorsal surface shallowly pitted, hilum ventral.

Cultivated seedlings (measured at ca node 10): cotyledons bilobed to oblong; stems rounded or squared in cross-section, glaucous; leaves sessile and opposite for many nodes, orbicular to cordate, 2-4.5 cm long, 1.2-4.5 cm wide, base amplexicaul to rounded, apex emarginate, rounded or pointed, glaucous to grey-green.


NOTES


Eucalyptus alligatrix ( Latin alligatrix, she who binds together, refers to the relationship of the species to E. cinerea and E. cephalocarpa ).

A small to medium-sized tree of undulating to montane south-eastern Australia inland from the Great Dividing Range.

E. alligatrix
has extensive, thick rough fibrous bark, glaucous juvenile leaves and a crown of adult and intermediate leaves.

It has three subspecies differing in geography and proportion of adult and sub-adult leaves in the crown:

subsp. alligatrix
From the Eildon - Jamieson - Big River area of Victoria with buds in 3s and crown a mixture of alternate narrow adult and opposite broader intermediate leaves.

subsp. limaensis (after the farming district, Lima, in north-east Victoria, where the subspecies occurrs).
Occurs further north than subsp. alligatrix, only near Swanpool in Victoria. A taller tree with a completely adult crown of consistently alternate narrow leaves, buds in 3s and the smallest fruit of the three subspecies.

subsp. miscella (Latin miscella, mixed, refers to the 3 and 7-flowered inflorescences on the same tree).
Has a very restricted distribution near Rylstone, New South Wales, and is a smaller spreading woodland tree with a completely adult crown but with broader leaves than subsp. limaensis. Buds clusters are a mixture of 3s and 7s on the same tree.

Eucalyptus alligatrix 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. alligatrix belongs in series Argyrophyllae having longitudinally furrowed fibrous rough bark throughout, orbicular or ovate juvenile leaves opposite for many nodes and small diamond-shaped buds in 3s or mixed 3s and 7s. E. alligatrix has a greener, more adult-leaved crown than E. cinerea and E. conspicua whilst E. cephalocarpa and E. nova-anglica have buds in 7s. These 5 species form series Argyrophyllae.