The University of Tasmania's Key to Tasmanian Seed Plants states that Hakea decurrens (formerly H.sericea) is "an uncommon shrub found in Tasmania only in the Furneaux Group (Cape Barren, Clarke and Flinders Islands)". The book 'Living with Plants' by McLeod & Gray says Hakea sericea was was once widespread between Burnie and Devonport but now can only be found at Rocky Cape National Park. I cannot find any other reference to the plant being at Rocky Cape. However, it is not hard to imagine a widespread loss of coastal heath species between Burnie and Devonport as the Bass Highway and the Railway line run right along the coast for much of the route between these towns. In any case, my little bit of north-west coast has three plants which I purchased from a Tasmanian native plant nursery last year. All are doing well. They flowering peaks in July and August so they will provide plenty of winter nectar for the honeyeaters.
Note: This plant is much more widespread in N.S.W & Vic
(Click images for larger versions)
Coast Needlebush - Hakea decurrens - Inflorescence
Coast Needlebush - Hakea decurrens - Fruit
Coast Needlebush - Hakea decurrens - Leaves