52 
Austrobaileya 8(1): 47-54 (2009) 
Fig. 2. Duperreya halfordii. A. flowering branchlet x 1. B. flower x 4. C. corolla opened, with androecium x 4. D. 
ovary and style x 8. All from Cunningham & Milthorpe 2972 (NSW). Del. W.Smith. 
Distribution andhabitat : Duperreyahalfordii 
occurs in south-western Queensland and 
western New South Wales from Cunnamulla 
in the north to Cobar in the south (Map 1). 
It grows on rocky hills and along stoney 
creeklines in Acacia thickets particularly 
mulga {Acacia aneura) and lancewood 
(A. shirleyi ), and in red box {Eucalyptus 
intertexta) and leopardwood {Flindersia 
maculosa ) communities on sandy or loamy, 
often shallow, red soils. 
Phenology : Flowering has been recorded 
from September to November with fruiting 
through to February. 
Notes : Staples (2006) noted that plants of 
Duperreya commixta from around Cobar had 
wider sepals than those from Queensland and 
Western Australia but the sepals appeared 
intermediate in size between D. sericea and 
other specimens of D. commixta. In other 
respects he concluded the Cobar population 
was typical of D. commixta. Following the 
study of many more specimens that were seen 
by Staples it now appears that the eastern 
Australian populations are quite distinct from 
those in the west. There is a clear disjunction 
in the width of the outer sepals at fruiting and 
in the length:breadth ratio. The bracteoles at 
fruiting are larger in D. halfordii while the 
corolla, filaments and style are shorter. 
Etymology: Named in honour of David 
Halford, colleague, whose taxonomic and 
editorial assistance in preparing an account 
of the family Convolvulaceae for the Flora of 
Australia has been greatly appreciated. 
