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Flora of Australia Online

Banksia seminuda (A.S.George) Rye, Nuytsia 5: 25 (1984)
River Banksia

Banksia littoralis var. seminuda A.S.George, Nuytsia 3: 408 (1981). T: Nanga Brook, S of Dwellingup, W.A., 15 May 1973, A.S.George 11655 ; holo: PERTH; iso: CANB, K, MEL, NSW, PERTH.

Banksia seminuda subsp. remanens Hopper, Nuytsia 7: 16 (1989). T: 1 km due W of Conspicuous Beach carpark, Walpole–Nornalup Natl Park, W.A., 31 July 1987, S.D.Hopper 5920 ; holo: PERTH; iso: CANB, K, MEL, NSW, PERTH.

Illustrations: A.S.George, Banksia Book 191, 192, fig. 55, pl. 81 (1984); C.E.Rosser & A.S.George, Banksias III: pl. 73 (in press).

Tree to 25 m tall, usually straight-trunked, sometimes irregular, fire-sensitive. Bark fissured, hard. Stems tomentose. Leaves whorled; petiole 2–5 mm long; lamina thin, broadly linear, 5–12 cm long, commonly 10–18 mm wide, obtuse; margins slightly recurved, commonly serrate; upper surface appressed-pubescent, glabrescent; lower surface closely white-tomentose. Inflorescence 10–15 cm long; involucral bracts rusty-tomentose, persistent. Flowers golden; styles usually yellow, sometimes deep red. Perianth 21–24 mm long including limb of 3 mm; claws pubescent both sides; limb glabrous with prominent central nerve. Pistil hooked, 32–38 mm long, glabrous; pollen presenter narrowly ovoid, 0.5 mm long. Old flowers mostly soon falling. Follicles many, broadly linear to narrowly elliptic, 10–15 mm long, 3–7 mm high, 3–5 mm wide, smooth, tomentose. Seed obovate, 16–18 mm long; seed body cuneate, 8–9 mm long, 3–5 mm wide, smooth or slightly rugose. Fig. 35C–E.

Occurs in W.A., from Banksiadale to Broke Inlet and east to Two Peoples Bay. In red loam or gravelly loam along rivers and creeks in Jarrah-Marri forest; occasionally on sandy flats and coastal dunes. Flowers Apr.–July. Map 241.

W.A.: Camfield, Broke Inlet, A.S.George 11789 (PERTH); Bow R., Dec. 1912, S.W.Jackson (NSW); Big Brook, M.Koch 2576 (BRI, MEL); Napier Ck, c. 24 km N of Albany, Nov. 1909, J.H.Maiden NSW119887 (NSW).

Killed by fire and regenerates from seed. Follicles usually opening when mature. Closely related to B. littoralis which is always an irregular tree or shrub with friable bark, narrow leaves, a tomentose perianth limb and the style less strongly curved; it is fire-tolerant. Also related to B. verticillata , a broad shrub with thick entire leaves and pubescent flowers. Subsp. remanens is considered to lie within the considerable variation in habit and leaf size and is not accepted as a distinct taxon (George, 1996).

(A.S.George)

 

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