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1966, Report of the Forest Research Institute, Rotorua, New Zealand Forest Service, page 76:
Russell and tree lupin produced seed, and seedlings are growing. The larger tree lupin plants are growing in spite of snow damage.
1983, John C. Gordon, Biological nitrogen fixation in forest ecosystems: foundations and applications:
Studies in New Zealand began at Woodhill, one of the coastal sand dune forests of the North Island, in which marram grass (Ammophila arenaria) and perennial tree lupin (Lupinus arboreus) are used to stabilise the sand before Pinus radiata forest is established.
1993, Peter Alma, Environmental Concerns, page 98:
Where the slopes are too steep for agricultural management and where coarser-grained wastes are too droughty for pasture legumes to persist, the end point of the reclamation process could be a scrub cover of tree lupins (Lupinus arboreits) and/or gorse (Ulex spp.), the willow (Salix cinera) and eventually oak (Quercus spp.) woodland.
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tree lupin on Wikipedia.Wikipedia 