Hill and Johnson, Eucalyptus (Myrtaceae) 
525 
6 Leaves more or less coriaceous, not deciduous Subseries Argillaceosae 
6* Leaves chartaceous, mostly deciduous in dry season . 
. Subseries Distantosae 
2* Adult leaves opposite, sessile . Subseries Pruinorosae 
1* Fruits dehiscing immediately upon maturity, more or less chartaceous 
7 Inflorescence units regularly umbelliform . Subseries Tectificosae 
7* Inflorescence units not regularly umbelliform . Subseries Microthecosae 
Subseries Oliganthosae 
Bark fully persistent. Adult leaves ovate to orbiculate, petiolate. Fruit persistent. Seeds 
dark grey-brown or charcoal to black. 
A subseries of three species occurring in the north of the Northern Territory and the 
Kimberley region of Western Australia. 
7. Eucalyptus oligantha Schauer, in Walpers, Repert. Bot. Syst. 2: 926 (1843). 
Type: Northern Territory: Copeland Island, Mountnorris Bay, A. Cunningham 250, 12 
Apr 1818 (lecto (here designated) BM; isolecto CANB, K, NSW). Cited as: A. Cunn. 
Herb. no. 250/1818.' It is unclear as to where the primary set of specimens studied by 
Schauer may have been, and the BM specimen is hence here designated the lectotype 
since the BM was the primary repository and source for the Cunningham collections. 
= E. hillii Maiden, /. & Proc. Roy. Soc. New South Wales 53: 63 (1919). 
Type: Northern Territory: Bathurst Island, G.F. Hill 468, 6 Nov 1916 (holo NSW). 
Included in E. oligantha by Blake (1953). 
= E. hillii Maiden var. alleniana Blakely & Jacobs in Blakely, Key Eucalypts : 239 (1934). 
Type: Northern Territory: near Stapleton, M.R. Jacobs 58, 12 July 1935 (holo NSW 10054). 
Included in E. oligantha by Blake (1953). 
Tree to 15 m tall. Bark persistent throughout, pale grey, shortly fibrous-flaky. Juvenile 
leaves disjunct early, petiolate, ovate to orbiculate. Adult leaves disjunct, similifacial, 
broadly ovate to orbiculate, semiglossy to glossy dark green, acute or obtuse, 50-150 mm 
long, 40-130 mm wide; petioles 25-60 mm long. Lateral veins ± closely-spaced, 
regular, at 40-60° to midrib; reticulum even, dense; oil glands small, dense, often 
difficult to see; intramarginal vein continuous, distinct, 0.5-1 mm from margin. 
Inflorescences compounded, pseudoterminal or lateral; unit umbellasters 
3-7-flowered. Peduncles terete, 4-14 mm long. Pedicels terete, 2-11 mm long. Mature 
buds ovoid to clavate, apiculate, smooth, 6-9 mm long, 3-5 mm diam. 
Calyptra hemispherical to conical, sometimes apiculate, _-l times as long as 
hypanthium. Fruit cylindrical to cup-shaped, smooth, 3-4-locular, 5-11 mm long, 5-9 mm 
diam.; calyptra scar and stemonophore flat or somewhat depressed, c. 0.5 mm wide; 
disc vertically depressed, 1-2 mm wide; Valves broadly triangular, obtuse, basally 
enclosed, vertically raised with tips at rim level to distinctly exserted. 
Two subspecies may be distinguished on regional differences in leaf, bud and fruit size. 
8A. subsp. oligantha 
... 8B. subsp. modica 
1 Fruit large (6-11 x 6-9 mm) 
1* Fruit small (5-6 x 5-6 mm). 
