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Nearest to E. obtusiflora, from which it can be distinguished by the following 
combination of characters: mallee; bark smooth; juvenile leaves glaucous; buds and 
fruits not glaucous; fruits small (to 8 x 7 mm), not ribbed (see also Table 10). Although 
various of these character states are shared with the subspecies of E. obtusiflora in 
different combinations, it is the combination of characters that distinguishes this taxon. 
Distributed over a restricted area from east of Wubin to Ballidu, east to Kulja (Fig. 21). 
Locally frequent in mallee shrubland on yellow sandplain country. Often associated 
with E. plenissima (C. Gardner) Brooker and £. doUchocera L.A.S. Johnson & K.D. Hill, 
although about 15 other eucalypt species have been recorded as associates. 
Conservation status: not at risk. 
The epithet is from the occurrence in the Wubin district. 
Selected specimens (from 10 examined): Western Australia: between Damboring and Ballidu, at 
rail crossing, 8.6 km N of Ballidu, Brooker 7923 ,12 Jan 1983 (CANB, NSW); 6.6 km E of old rabbit 
proof fence on Glamoff road, E of Wubin, Brooker 8302, 25 Oct 1983 (CANB, NSW); on old rabbit 
proof fence, south of Glamoff road, Brooker 8303 ,26 Oct 1983 (CANB, NSW); 1.3 km S of Glamoff 
Road on RPF [Rabbit Proof Fence] road E of Wubin, Brooker 8429 ,25 Jan 1984 (CANB, NSW); c. 3 km 
SE of Karrakatta [Karrakutata] hill, Brooker 8431, 25 Jan 1984 (NSW); 1.2 km E of highway on 
Goatcher rd (N of Dalwallinu), Hill 2938, 27 Aug 1988 (NSW, CANB, PERTH); Watheroo Rabbit 
fence, Koch 1608, Sep 1905 (NSW). 
18. Eucalyptus assimilans L.A.S. Johnson & K.D. Hill, sp. nov. 
Affinis £. sheafhianae, distinguitur: folia, alabastra et fructus multum majores; 
pedunculi pedicellique proportione longiores. 
Type: Western Australia: 20.2 km W. of Balladonia Roadhouse on Highway 1 (32°15'S 
123°26'E), K.D. Hill 218 & L.A.S. Johnson, 19 Oct 1983 (holo NSW; iso CANB, K, PERTH) 
Tree to 15 m tall. Bark smooth to base, white or greyish, shed in long, broad pale brown 
ribbons. All parts glaucous. Juvenile leaves ovate to broad-lanceolate, markedly 
acuminate. Adult leaves disjunct, lanceolate, acuminate, ± falcate, dull or slightly 
glossy, 7.0-18.0 cm long, 1.5-4.0 cm wide; petioles terete or slightly flattened, 2.0-3.3 cm 
long; lateral veins indistinct, at c. 30° to midrib, moderately spaced, ± degenerate; 
intramarginal vein indistinct, 0.5-1.0 mm from margin. Umbellasters axillary, 
7-flowered. Peduncles terete or vaguely angular, 10-22 mm long. Pedicels terete or 
vaguely angular, 4-8 mm long. Mature buds ovoid, c. 15 mm long and 7 mm diam. (or 
more); calyptra conical, convex, obtuse, slightly shorter than hypanthium. Fruits 
obconical, 5-locular, 9-12 mm long, 8-9 mm diam.; calyptra scar and stemonophore 
c. 1 mm wide, raised at c. 45°; disc depressed at c. 45°, 1.5-2.0 mm wide; valves broadly 
triangular, obtuse, enclosed. Seeds irregular, flattened, shallowly reticulate, glossy 
deep red brown, 2.5-3.0 mm long; hilum ventral. Chaff similar, angular, smaller (Fig. 24). 
Scattered along the highway from the type locality west to around Newman's Rock 
(Fig. 25). The country away from the highway is poorly explored, and further 
exploration will probably extend the range of this species. 
A sporadic woodland species on somewhat sandy calcareous loams in gently 
undulating country. Associated with E. optima, E. melanoxylon, E. indurata and Triodia sp. 
E. assimilans differs from £. sheathiana Maiden in the much larger leaves, buds and 
fruits with proportionally longer peduncles and pedicels. 
Conservation status: not considered to be at risk. 
The epithet is from the Latin assimilans, a variant of assimulans, making like, in a sense 
resembling, from the species general resemblance to E. sheathiana. 
