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Flora of Australia Online

PLACOSPERMUM

P.H.Weston

Placospermum C.T.White & W.D.Francis, Proc. Roy. Soc. Queensland 35: 79 (1924); from the Greek plax , plakos (a flat body), and sperma (a seed), alluding to the flat, winged seeds

Type: Placospermum coriaceum C.T.White & W.D.Francis

Trees. Leaves alternate, shortly petiolate, with brochidodromous venation. Inflorescence elongate, terminal and lateral, mostly paniculate, with 1–2 orders of branching, or rarely racemose, anauxotelic; ultimate branches racemose. Flowers zygomorphic, andromonoecious, subtended by scale leaves. Tepals free, curved to anterior. Hypogynous glands 4, subequal. Staminal filaments adnate to tepals. Fertile anther linear-oblong, introrse; connective slightly wider than loculi, extending beyond loculi as terminal appendage. Staminodes resembling stamen but narrower. Gynoecium absent in male flowers; ovary obloid, sessile; style curved to anterior; stigma anterolateral. Ovules and seeds 15–22. Follicle dorsiventrally compressed-ovoid to -ellipsoidal. Cotyledons 2. n = 7, L.A.S.Johnson & B.G.Briggs, Austral. J. Bot. 11: 24 (1963). 

A monospecific genus, endemic in Australia. 

C.Venkata Rao, Studies in the Proteaceae II. Tribes Placospermeae and Conospermeae, Proc. Natl Inst. Sci. India 27B: 126–151 (1961); J.W.Wrigley & M.Fagg, Banksias, Waratahs & Grevilleas 511–512 (1989).

coriaceum

 

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