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Flora of Australia Online

Grevillea dimorpha F.Muell., Trans. Philos. Soc. Victoria 1: 21 (1855)
Flame Grevillea, Olive Grevillea

Grevillea oleoides subsp. dimorpha (F.Muell.) Benth., Fl. Austral. 5: 469 (1870); Grevillea speciosa subsp. dimorpha (F.Muell.) McGill., New Names Grevillea 14 (1986). T: 'In the Grampians, Serra- & Victoria Ranges' [protologue], [Vic., s.d. , F.Mueller ]; lecto: MEL, fide D.J.McGillivray & R.O.Makinson, Grevillea 442 (1993); isolecto: MEL; remaining syntypes: K, MEL, NSW.

Grevillea dimorpha var. latifolia F.Muell., Trans. Philos. Soc. Victoria 1: 21 (1855), as a, latifolia , nom. illeg. ; Grevillea dimorpha var. lanceolata Meisn., in A.L.P.P. de Candolle, Prodr. 14: 353 (1856), as α lanceolata , nom. illeg.  T: 'In the Grampians, Serra & Victoria Ranges' [protologue], [Vic., s.d. , F.Mueller ]; lecto: MEL (same specimen as lectotype of Grevillea dimorpha ), fide D.J.McGillivray & R.O.Makinson, Grevillea 442 (1993); isolecto: MEL; remaining syntypes: K, MEL, NSW.

Grevillea dimorpha var. angustifolia F.Muell., Trans. Philos. Soc. Victoria 1: 21 (1855), as b, angustifolia ; Grevillea dimorpha var. linearis Meisn., in A.L.P.P. de Candolle, Prodr. 14: 353 (1856), as β linearis , nom. illeg.  T: Mt Abrupt [Vic.], s.d. , Dr M [F.Mueller ]; lecto: MEL, fide D.J.McGillivray & R.O.Makinson, Grevillea 442 (1993); isolecto: MEL; remaining syntypes: K, MEL.

Illustrations: L.F.Costermans, Native Trees & Shrubs of SE Australia 160 (1981); D.J.McGillivray & R.O.Makinson, Grevillea 331, col. pl. (1993), as Grevillea speciosa subsp. dimorpha ; P.M.Olde & N.R.Marriott, Grevillea Book 2: 127 (top right & 102A), 128 (102B, C) (1995).

Regenerates from seed.

Erect to spreading shrub 0.4–3 m tall, rarely decumbent to prostrate. Leaves linear or narrowly to broadly elliptic or obovate, 5–15 cm long, 1.5–20 (–40) mm wide; upper surface obscurely punctate; margins recurved to revolute; lower surface subsericeous, occasionally mostly enclosed. Conflorescence usually axillary or occasionally cauline, or rarely terminal on short lateral branchlets, usually decurved, sessile or very shortly pedunculate, a loose irregular to subsecund cluster, 2–16-flowered, opening indeterminate. Flowers abaxially oriented on twisted or retrorse pedicels. Flower colour: perianth and style bright red. Perianth subsericeous to openly tomentose outside, bearded inside. Pistil 21–26 mm long; style gently curved, usually with scattered minute erect hairs near tip; pollen-presenter strongly oblique. Follicle ellipsoidal, 12–16 mm long, colliculose. 

Occurs in Vic., where endemic to the Grampians Range area. Grows in heathy woodland and forest, in well-drained sites in sandy or light loam soils. Flowers mainly Aug.–Dec. Map 187.

Vic.: Victoria Valley, Grampians, A.C.Beauglehole 7767 & L.G.Dale (NSW); Mt Abrupt, S end of Serra Ra., A.C.Beauglehole 30200 & B.A.Fuhrer (MEL); Mirranatwa Gap, Grampians, 29 Aug. 1958, L.A.S.Johnson NSW47218 (NSW); Teddy Bear Gap, Serra Ra., R.Melville 1841 et al. (MEL); foot of Mt Sturgeon, A.N.Rodd NSW130792 (NSW).

Grevillea dimorpha was reduced by McGillivray (New Names Grevillea 14 (1986), see also McGillivray & Makinson Grevillea 330–332 (1993)) to one of three subspecies of G. speciosa , with G. oleoides similarly treated (both the latter are Sydney Basin endemics). Grevillea dimorpha possesses a narrow suite of distinctive character-states and is geographically very disjunct from its sister taxa.

Grevillea dimorpha is easily distinguished from G. speciosa on leaf length and inflorescence position; G. dimorpha also has the ovary conspicuously wider than the stipe and style (scarcely so in G. speciosa ), and a more oblique pollen-presenter. Grevillea oleoides is more easily confused, but has a longer pistil 28–36 mm long, the ovary scarcely broader than the style, and usually more flowers (5–16) per unit conflorescence.

Grevillea dimorpha shows considerable variation in habit and leaf form, and phenotypes with varying degrees of populational integrity can be distinguished. A 'narrow-leaved form' with sublinear leaves 1–3 mm wide occurs in the south of the range from Yarram Gap to Mt Abrupt; the leaf form is not associated with riparian habitat. Broad-leaved plants with leaves 15–40 mm wide are widespread in southern and central parts of the range. A 'robust form' growing 2–4 m tall occurs in the Fyans Ck area; it has greyish leaves (dark green in all other populations). A 'decumbent form' occurs in the Jimmy Ck area.

(R.O.Makinson)

 

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