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Flora of Australia Online

Grevillea acuaria F.Muell. ex Benth., Fl. Austral. 5: 452 (1870)

T: W. Australia, s.d. , J.Drummond s.n. ; holo: K; iso: K, MEL.

Grevillea aculeolata S.Moore, J. Linn. Soc. Bot. 34: 222 (1899). T: between Wilson's Creek and Lake Darlot, W.A., s.d. , S.Moore s.n. ; holo: BM; ?iso: K.

Grevillea aculeolata var. longifolia S.Moore, J. Linn. Soc. Bot. 34: 222 (1899). T: between Wilson's Pool and Lake Darlot, W.A., May, S.Moore s.n. ; holo: BM; ?iso: K.

Grevillea arida C.A.Gardner, J. & Proc. Roy. Soc. W. Australia 9: 39 (1923). T: Widgiemooltha, W.A., 25 Sept. 1922, C.A.Gardner 1272 ; holo: PERTH; iso: MEL, PERTH.

Illustrations: D.J.McGillivray & R.O.Makinson, Grevillea 362, fig. 88, 363, col. pl. (1993); P.M.Olde & N.R.Marriott, Grevillea Book 2: 13 (bottom right), 14–15 (7A–I) (1995).

Regenerates from seed or lignotuber.

Rounded bushy to erect shrub 0.2–1.5 m tall. Leaves entire, spreading, subterete-trigonous to linear-subulate or linear, rarely narrowly elliptic, 0.5–3 cm long, 0.5–3.5 (–4.5) mm wide, rigid to pliable, pungent or not; upper surface glabrous or subsericeous to pubescent, dull or shiny, rarely punctate or with prominent ribs; margins smoothly revolute or recurved; lower surface usually obscured except midvein and then 2-grooved, occasionally 1-grooved when dry. Conflorescence terminal or axillary, erect, sessile or almost so, simple, usually (2–) 4–6 flowers in a loose cluster, sometimes solitary; rachis < 1 mm long, subsericeous or pubescent. Flowers abaxially oriented. Flower colour: perianth scarlet, deep burgundy or cherry-red; style green or red, often with green tip. Perianth glabrous outside and slightly glaucous, bearded inside; tepals rolled back to curve after anthesis. Pistil 14–21 mm long; stipe 0.5–2 mm long; style exserted in late bud; pollen-presenter lateral to very oblique. Follicles ±erect on stipe, 8–11 mm long, 3–5 mm wide, usually ovoid to obloid-ovoid with attenuated apex, colliculose. 

Widespread in south-western W.A. between Lake Darlot, Brookton, Mt Ragged and Balladonia. Habitat variable, often in winter-wet situations in woodland, heath or mallee communities in clay to sand soils. Flowers mainly May–Oct., sporadically in other months. Map 178.

W.A.: 46 km from Coolgardie along Eyre Hwy towards Norseman, B.Barnsley 1051 (CANB); near to McPherson Rock, by Coolgardie–Esperance Hwy, c. 30 km S of Norseman, M.D.Crisp 973 (CANB); c. 29 km NE of Southern Cross, K.Newbey 2515 (CANB, PERTH); Beacon Hill, Norseman, M.E.Phillips CBG025389 (CANB, PERTH); 28 km from Corrigin along road to Kondinin, J.Taylor 2441 & P.Ollerenshaw (CANB, NSW, PERTH).

Grevillea acuaria is similar to G. punctata and G. sulcata , which differ in their slightly broader perianth limb (2–2.2 (–2.5) mm wide in G. acuaria ), leaves with a prominent midvein on the upper surface, usually refracted leaf margins, very prominent nectary, and follicles 6–7 mm wide; G. punctata also has leaves with a punctate upper surface. Grevillea decipiens , G. oligantha and G. sparsiflora differ in having an open to dense appressed indumentum on the outer perianth surface. Grevillea kennedyana differs in its larger flowers with torus > 4 mm across (< 3 mm across in G. acuaria ), ovary stipe 4–5.5 mm long, and 8–12-flowered unit conflorescence.

Olde & Marriott (Grevillea Book 2: 13–15 (1995)) recognise nine forms; some of these are noted here and further investigation of variation in the species is required. The 'needle-leaf form' (which includes the type material) has leaves spreading to ascending, subterete-trigonous, 1–3 cm long, with an aristate point. It occurs roughly from Brookton to Coolgardie. The 'dagger-leaf form' (which includes the type of G. aculeolata ) is very similar but the leaves are broader, linear, and the flowers are often larger. It is found from Coolgardie and Norseman to Balladonia. The 'Parker Range form', found only in the Parker Ra., where it occurs with the 'soft-leaf form', has obtuse pungent leaves with margins not completely obscuring the lower leaf surface beside the midvein, and obloid-ellipsoidal follicles. The 'soft-leaf form' has leaves that are soft, bright green (or sometimes glaucous), ascending to erect, crowded, c. 1 cm long, not pungent. It occurs mostly in the Lake King to Bremer Ra. area, and has also been collected from Norseman and Mt Madden. The 'glaucous leaf form' has broader leaves which are obovate to elliptic, 1.5–2 (–4.5) mm wide, obtuse-mucronate, with margins obscuring lower leaf surface. This form is found between Lake Cronin and Bremer Ra., with isolated collections from Mt Ragged and SE of Norseman.

(R.O.Makinson)

 

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