Spinifex sericeus, commonly known as hairy spinifex, rolling spinifex, beach spinifex or coastal spinifex, is a dioecious perennial grass native to Australia and New Zealand. It has branched stolons and rhizomes extending up to several metres. The leaves have a ligule of a rim of dense hairs; the blades are flat and densely silky. The male inflorescence is an orange-brown terminal cluster of spiky racemes subtended by silky bracts. The female inflorescence detaches at maturity, a globose seed head of sessile racemes up to 20 cm in diameter which becomes a tumbleweed. It is an important pioneer species which colonises coastal dunes, binding loose sand with its horizontal runners.
- Jacobs, S.W.L.; & Hastings, S.M. "Spinifex sericeus R.Br.". PlantNET. National Herbarium of NSW, Sydney. Retrieved 2012-05-29.
- Longmore, Sue; Smithyman, Steve & Crawley, Matt (2010). Coastal Plants of the Bellarine Peninsula. Bellarine Catchment Network.
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