Hill, Johnson and Blaxell, Systematic studies in the eucalypts 
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± pyramidal, angular; semi-glossy grey-black, shallowly and regularly reticulate, 2-3 mm 
long; hilum ventral; chaff smaller, angular, red-brown. 
Two geographic subspecies are recognised, as below. 
Hybrids are recorded between £. platycorys and both subspecies. 
12A. Eucalyptus scyphocalyx (F. Muell ex Benth.) Maiden & Blakely subsp. scyphocalyx 
Adult leaves lanceolate to broad-lanceolate, glossy to semiglossy, 4.0-12.0 cm long, 
0.8-2.5 cm wide; petioles 0.8-2.2 cm long. Umbellasters 7-flowered. Peduncles 3-13 mm 
long. Pedicels 1—7 mm long. Mature buds 8-12 mm long, 6-8 mm diam. Fruits ovoid 
to cup-shaped or campanulate, smooth or shallowly ribbed, 8-12 mm long, 7-11 mm 
diam. 
Locally frequent on grey or white sandy soils over laterites on flat country in the area 
from Jerramungup to Ravensthorpe and northeast towards Salmon Gums, occupying 
a zone to the north and west of £. leptocalyx subsp. leptocalyx (Figs. 12,13). Associated 
species include E. uncinata, E. cylindriflora Maiden & Blakely, £. cahycogona Turcz., 
E. eremophila (Diels) Maiden and E. spathulata Hook. 
Conservation status: not considered to be at risk. 
Selected specimens (from 15 examined): Western Australia: 29 km W of Jerramungup, Brooker 
8373, 23 Nov 1983 (CANB, NSW); E side of Lake Magenta, NE of farmhouse, Brooker 8783, 14 Jan 
1985 (CANB, NSW); 37 km SE of Lake King, North road, 6 km N of junction with Hayes Road, Crisp 
4994, 10 Jan 1979 (CANB, NSW, PERTH); 17 km S of Pingrup on rd to Ongerup, Hill 329, Johnson 
& Blaxell, 23 Oct 1983 (NSW, CANB, PERTH); 47.8 km past Fields road (5 ways) on Ravensthorpe 
track. Hill 2342, Johnson & Blaxell, 8 Nov 1986 (NSW, PERTH); 5.2 km W of Giles road (Findley road), 
on Magenta road. Hill 2399, Johnson, Blaxell & Brooker, 10 Nov 1986 (NSW, PERTH); 100 m S of S 
shore of Lake Chinocup, Hill 2461, Johnson & Blaxell, 13 Nov 1986 (NSW, PERTH); 43.8 km N of 
Lake King to Norseman rd on Rabbit Proof Fence rd. Hill 3045, 1 Sep 1988 (NSW); 6.7 km E on 
Needilup Nth Rd on Ryans Rd, Hill 3137, 7 Sep 1988 (NSW). 
12B. Eucalyptus scyphocalyx (F. Muell ex Benth.) Maiden & Blakely subsp. triadica 
L.A.S. Johnson & K.D. Hill, subsp. nov. 
Ab subspecies scyphocalyx umbellastris trifloras, fructus aliquanto breviores et 
distincte costati distinguitur. 
Type: Western Australia: 15.3 km south-east of Mount Ney road on Clyde Rock road, 
K.D. Hill 2268 & L.A.S. Johnson, 6 Nov 1986 (holo NSW; iso CANB, MEL, PERTH). 
Adult leaves lanceolate, semiglossy, 5.0-12.0 cm long, 1.0-2.2 cm wide; petioles 1.0-2.2 cm 
long. Umbellasters 3-flowered. Peduncles 3-10 mm long. Pedicels 1-7 mm long. 
Mature buds 8-12 mm long, 6-8 mm diam. Fruits cup-shaped or campanulate, often 
distinctly shallowly ribbed, 8-12 mm long, 8-11 mm diam. (Fig. 15). 
Three-flowered umbellasters readily distinguish subsp. triadica from the type 
subspecies. Fruits also tend to be more squat and more distinctly ribbed, and foliage 
is less coarse. 
Locally frequent on loamy calcareous soils in flat country in the area northeast of 
Esperance, in a zone lying to the east of subsp. scyphocalyx and to the north of 
E. leptocalyx subsp. petilipes (Fig. 13). Associated species include E. uncinata, E. ovularis 
Maiden & Blakely, E. oleosa, E. eremophila and E. gracilis. 
Conservation status: not considered to be at risk. 
The epithet is from the Latin triad, a group of three, from the 3-flowered inflorescences. 
