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E. singularis is distinguished within the E. incrassata complex by its habit, a non- 
lignotuberous tree of 'mallet' form; its narrow crown and its substrate, shallow sand 
on lateritic rises (see also Table 4). 
Only known from two (or three) populations in the region WNW of Ravensthorpe 
(Fig. 2). Associated species is predominently E. argyphea L.A.S. Johnson & K.D. Hill, 
but, at one locality, E. phaenophylla Brooker & Hopper and E. dissimulata Brooker are 
present. 
Conservation status: a species of very restricted distribution, although further 
searching may increase its range. Probably at risk because of its occurrence along road 
verges in farming land (2K). 
The epithet is from the Latin singularis, alone, solitary, in reference to the habit of this 
species in contrast to all other members of the E. incrassata complex. 
Specimens examined: Western Australia: 4.8 km from Koomong Road on Fitzgerald Road, Brooker 
8809 ,18 Jan 1985 (CANB, NSW, PERTH); Mallee Road, south of Lake King, Brooker 8888, 13 Mar 
1985 (CANB, NSW, PERTH); Old Ravensthorpe Road, Brooker 10146 ,12 Dec 1988 (CANB, NSW, 
PERTH); 4.5 km from Millsteed Road on Mallee Tree Road, Hill 2396, Johnson, Blaxell & Brooker, 
9 Nov 1986 (NSW, CANB, MEL, PERTH). 
Series Torquatae 
Series distinguished as follows: seeds ovoid-angular, wingless, dull, dark brown, grey 
or black, with regular deep sharp-edged pits; hilum indistinct; umbellasters 
3-11-flowered; filaments ± slender, basally ± constricted, apically gradually tapered to 
connective. 
The first taxa described in this series as now circumscribed were E. corrugata Luehm. 
and E. torquata Luehm. (Luehmann 1897), although Robert Brown had earlier 
delineated two other taxa as E. aticeps and E. rugosa in manuscript (both names were 
later adopted by Blakely (1934) for the taxa more or less as Brown delineated them). 
These were followed by £. griffithsii Maiden (1911). Maiden had earlier confused many 
different taxa including E. anceps (R. Br. ex Maiden) Blakely and £. rugosa in a 
complicated and flawed attempt to circumscribe E. dumosa (Crit. Revis. Eucalyptus 
1:101), an impossible task in those times of no or little information on many of the taxa. 
The additional taxa in this group were described by Maiden (E. melanoxylon Maiden, 
Crit. Revis. Eucalyptus 1922, 6: 351, E. concinna Maiden & Blakely, Crit. Revis. Eucalyptus 
1929, 8: 49) and then Blakely (E. bracln/calyx Blakely (1934: 119), £. rugosa R. Br. ex 
Blakely (1934:120). 
Recognition and circumscription of this series has occurred only in recent years. 
Maiden placed some of the species known in section Macrantherae subsection 
Tereticornes on the basis of anther morphology, in different series based on bark 
characters and together with quite unrelated taxa. Blakely placed the different species 
then known (except E. melanoxylon Maiden) in section Macrantherae subsection 
Subtruncatae series Dumosae, primarily on the basis of the more or less costate fruits, 
but in several subseries and in each case together with other species now placed in 
different series. E. melanoxylon was wrongly removed by him to series Exsertae with a 
group of Red Gums. 
Pryor and Jofinson (1971) recognised a series Torquatae, including the then known 
species of the series as now treated, but also including a number of other related taxa. 
The related taxa were removed to series Merrickiae and Ovulares by Brooker (1979, 
1981), to leave section Torquatae as discussed here (Table 5). The group was formally 
described as series Torquatae by Chippendale (1988), although he included E. deflexa 
Brooker, which was not included in a subsequent discussion of this series by Brooker 
