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midrib; reticulum even, dense; oil glands small, obscure; intramarginal vein 
continuous, distinct, 0.5 mm from margin. Inflorescences simple or compounded, 
pseudoterminal or axillary; unit umbellasters 3-7-flowered. Peduncles thick, terete, 
2-9 mm long. Pedicels thick, terete or angular, 1-3 mm long. Fruit cylindrical to 
cup-shaped, tapering into pedicel, 4-5-locular, 7-9 mm long, 7-10 mm diam.; calyptra 
scar and stemonophore flat, 0.7-1.0 mm wide; disc flat to vertically depressed, 1-2 mm 
wide; valves broadly triangular, obtuse or acute, basally enclosed or rim level, apically 
rim level or exserted, raised at 45-90°. Seeds semi-glossy to dull, brownish black, 
somewhat angular to rounded, elliptical, regularly shallowly reticulate; hilum ventral. 
Chaff brown. 
E. xerothennica is nearest to E. limitaris, differing in the thicker leaves, generally shorter 
pedicels and peduncles, and proportionally broader fruits. 
Distribution: Western Australia: Pilbara region, North West Cape and nearby islands 
(Fig. 16). 
Ecology: widely scattered but local, on red, shallow loam, usually calcareous and often 
with calcrete, over various rock types. A component of low open savanna, associated 
with £. camaldulensis var. obtusa, E. victrix L.A.S. Johnson & K.D. Hill, Corymbia 
hamersleyana and C. Candida. 
E. xerothermica and E. tephrodes show a pattern of intergradation similar to that of 
E. limitaris and £. tephrodes, discussed above under E. limitaris. In this case, however, 
E. tephrodes tends to occur on deeper soils on lower sites or on flatter country 
somewhat to the east of the range of £. xerothermica. Very little pure E. tephrodes with 
no E. xerothermica influence is known, however. 
Conservation status: widespread and locally abundant, not considered to be at risk. 
Tire epithet is from the Greek xeros, dry, and thermos, hot, referring to the hot and dry 
climate of the Pilbara region. 
Selected specimens (from 13 examined): Western Australia: 13 miles [21 kmj F, of Mt Bruce in 
Dales Gorge, Brooker 2175 ,29 Sep 1969 (PERTH, NSW); 58.8 km S of Exmouth on main rd. Hill 404, 
Johnson, Blaxell, Brooker & Edgecombe, 28 Oct 1983 (NSW); 3.5 km W of Exmouth along Charles Knife 
rd, 30 km S of Exmouth, Hill 411, Johnson, Blaxell, Brooker & Edgecombe, 28 Oct 1983 (NSW, CANB, 
PERTH); 35 km NW of Highway on Onslow rd. Hill 427, Johnson, Blaxell, Brooker & Edgecombe, 
29 Oct 1983 (NSW); top of Mt Meharry, Hill 479, Johnson, Blaxell, Brooker & Edgecombe, 1 Nov 1983 (NSW). 
Subseries Pruinorosae 
Bark fully persistent, 'box'. Adult leaves opposite, ± sessile, ovate, cordate, strongly 
glaucous. Fruit persistent. Seeds dark grey-brown or charcoal to black. 
14. Eucalyptus pruinosa Schauer, in Walpers, Rep. Bot. Syst. 2: 926 (1843). 
Type: Queensland: Sweers, Bentinck & Allen's Is., R. Brown & F. Bauer 33, Nov 1802 
(holo W; iso BM, E, K). Cited as: 'In Nova Hollandia fructiferam legit Ferd. Bauer!' 
Tree or mallee to 6 m tall. Bark fully persistent, grey to grey-brown, shortly 
fibrous-flaky. Juvenile leaves opposite, at first petiolate, later sessile, ovate to elliptical. 
Adult leaves opposite, sessile, often amplexicaul, similifacial, dull grey-green or 
glaucous, ovate to elliptical, rounded to acute, 25-150 mm long, 15-90 mm wide. 
Inflorescences compounded, pseudoterminal; unit umbellasters 3-7-flowered. 
Peduncles terete, 4-25 mm long. Pedicels terete, 2-22 mm long. Buds narrowly ovoid 
to fusiform, often glaucous, 6-12 mm long, 3-6 mm diam.; calyptra conical and acute 
to hemispherical and rostrate, 1/2-1 times as long as hypanthium. Fruit cylindrical to 
cup-shaped, tapering into pedicel, 3-5-locular, 5-12 mm long, 4-10 mm diam.; 
calyptra scar and stemonophore flat, 0.7-1.0 mm wide; disc flat to vertically depressed, 
