Multistemmed shrub 0.2-1 m tall. Leaves entire, narrowly elliptic to narrowly obovate, 1-3 cm long, 1-5 mm wide, often varying much in size on a plant; margins revolute to recurved; upper surface granulose; lower surface often enclosed on smaller leaves, subsericeous. Conflorescence terminal or upper-axillary, ±erect, simple to 3-branched; unit conflorescence a loose subglobose to shortly subcylindrical or semi-secund cluster, 6-20-flowered, basipetal; floral rachis 2-5 mm long, sericeous to sparsely so. Flowers acroscopic. Flower colour: perianth green to cream; style reddish. Perianth loosely tomentose to almost glabrous outside, bearded inside in lower third. Pistil 12.5-17.5 mm long; ovary sessile, villous; style tomentose to subvillous (white biramous hairs) also with simple erect hairs, scarcely to moderately exserted from late bud; pollen-presenter almost lateral. Follicle ovoid, 13-15 mm long, loosely tomentose, faintly ridged; style persistent, ?erect.

Flowers most months, peaking June-Oct.

Occurs in N.S.W. in the Blue Mtns W of Sydney, in the Kedumba Valley and Yerranderie areas.

Grows in dry sclerophyll forest in sandy soils over quartzite or sandstone.

This species is recognised as 'Poorly Known' in J.D.Briggs & J.H.Leigh, Rare or Threatened Australian Plants (1995).

N.S.W.: The Cedar Track near Kiaromba Ridge to Devitts Ra., [and?] Coxs R. to Kowmung R., L.A.S.Johnson NSW15640 (NSW); E slope of Mt Solitary, Kedumba Valley, A.Willows NSW92639 (NSW); 3.6 km S of Mt Cookem, Scotts Main Ra., M.Kennedy 22 et al. (NSW); Kedumba Valley, 1.6 km S of Reedy Ck, L.A.S.Johnson & D.Benson (K, NSW, US n.v. ).

Plants very similar to G. kedumbensis but with less strongly granulose leaves and slightly longer pistils occur in the Couridjah area; these are here assigned tentatively to G. mucronulata , but may represent an intergrade between the two species. Grevillea kedumbensis was first recognised as a subspecies of G. obtusiflora , but the latter species differs in its red perianth, fewer flowers per unit conflorescence, and fairly consistent leaf size on any one plant.

A.Fairley & P.Moore, Native Pl. Sydney District 168, t. 555 (1989), as Grevillea obtusiflora ; D.J.McGillivray & R.O.Makinson, Grevillea 265 (1993), as Grevillea obtusiflora subsp. kedumbensis ; P.M.Olde & N.R.Marriott, Grevillea Book 2: 222 (top right & 185A), 223 (185B) (1995).

Data derived from Flora of Australia Volumes 16 (1995), 17A (2000) and 17B (1999), products of ABRS, ©Commonwealth of Australia