528 
Telopea 8(4): 2000 
Distribution: Western Australia: central north-east Kimberley region (Fig. 13). 
Ecology: locally abundant but apparently restricted on dry, elevated skeletal soils over 
sedimentary rocks, with Corymbia grandifalia (R. Br. ex Benth.) K.D. Hill & L.A.S. 
Johnson, Eucalyptus obconica Brooker & Kleinig and £. jensenii Maiden. 
Conservation status: widespread and locally abundant, not considered to be at risk. 
The epithet is from the Latin costa, a vein or rib, with the diminutive suffix -ula, -ulum, 
together with the suffix -ger, bearing or carrying, referring to the distinctively finely 
ribbed fruits. 
Specimens examined: Western Australia: 11 km W of Durack R crossing on Gibb 
R. rd, Hill 944, Johnson & Benson, 23 July 1984 (NSW); 12.7 km W of Durack R on Gibb R. Rd, Hill 
3374, Johnson & Stanberg, 19 Nov 1988 (NSW, CANB, PERTH); 82 miles [c. 133 km] SW of Wyndham 
Township, Perry 3087, 29 Aug 1952 (CANB, NSW). 
Fig. 12. E. costuligera. a, adult leaves, inflorescences and buds; b, transverse section of bud; 
c, anther; d, fruits, (from Brooker 7780). Scale bar: a, d = 10 mm; b = 1 mm; c = 0.5 mm. 
