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Eucalyptus apothalassica


Inland white mahogany

Eucalyptus apothalassica L.A.S.Johnson & K.D.Hill, Telopea 4: 84 (1990).

T: Queensland: on property 5 km south of Kogan on Tara road, 25 Aug. 1984, K.D.Hill 1245 & L.A.S.Johnson; holo: NSW; iso: PERTH, BRI, CANB.

Tree to 15 m tall. Forming a lignotuber.
Bark rough throughout, grey or grey-brown, fibrous, held in flattish strips rather than like typical stringybark.
Juvenile growth (coppice or field seedlings to 50 cm): stem rounded in cross-section; juvenile leaves opposite and sessile for at least 10 pairs then becoming alternate, petiolate, ovate to lanceolate, 6.5-15 cm long, 2-4.5 cm wide, discolorous, slightly glossy, green or blue-green.
Adult leaves alternate, petiole 0.5-2.2 cm long; blade lanceolate to falcate, 5-14 cm long, 1.2-2.8 cm wide, base oblique or tapering evenly to petiole, margin entire, concolorous, dull or glossy, green,
side-veins greater than 45° to midrib, moderately to densely reticulate, intramarginal vein parallel to and well removed from margin, oil glands island or obscure.
Inflorescences axillary unbranched, peduncles 0.5-2.3 cm long; buds 11 to 15, pedicellate, ovoid to fusiform, green to yellow, scar absent, operculum conical to beaked, 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.
Fruit pedicellate, truncate-globose or barrel-shaped, 0.5-0.7 cm wide, disc descending, valves 3 or 4, slightly exserted or near rim level.
Seed brown, 1-2 mm long, pyramidal or obliquely pyramidal, dorsal surface smooth, hilum terminal.

Cultivated seedlings (measured at ca node 10): cotyledons reniform; stems rounded in cross-section; leaves opposite and sessile for ca 9 or 10 nodes, lanceolate, 9-15 cm long, 3-4.5 cm wide, base amplexicaul to rounded, discolorous, green, becoming slightly glossy.


NOTES

Eucalyptus apothalassica (Greek apo, away from and thalassicos, the sea, refers to its distribution in relation to its congeners).

A small to medium-sized tree on sandstone-derived soils in the Yetman area of the North Western Plains of New South Wales extending to the Carnarvon Range in central Queensland. E. apothalassica is a white mahogany weakly distinguished from the widespread, but more coastal E. acmenoides, only by the concolorous, thicker, less glossy adult leaves and the lower stature.
These two species, plus the coastal species E. psammitica , E. umbra and E. carnea , which also have concolorous leaves, form section Amentum.

Eucalyptus apothalassica belongs in Eucalyptus subgenus Eucalyptus, because the buds have a single operculum, the anthers are reniform, ovules are in 2 rows and the seeds are ± pyramidal. The five species forming section Amentum are recognised principally by the extensive rough bark which is in flattish strips, the clustering of inflorescences towards the ends of branchlets, the densely reticulate venation of the adult leaves, and the opposite, sessile juvenile leaves, which may indicate some affinity with the blackbutts (section Pseudophloius) and the peppermints (section Aromatica).