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'''''Lupinus arboreus''''' ('''Yellow Bush Lupine''') is a species of [[lupin]]e native to the western [[United States]] in [[California]], where it is widely distributed [[coast]]al scrub and [[sand]] [[dune]]s. Because it has been widely introduced, there is some uncertainty about its native range; it is thought to be native from [[Point Reyes National Seashore]] south to [[San Luis Obispo County, California|San Luis Obispo County]]. It is a perennial [[shrub]] growing to 2 m tall (hence the alternative common name, '''tree lupine''') in sheltered situations, but more typically 1-1.5 m tall. It has green to gray-green palmate leaves, with 5-12 leaflets per leaf. The leaflets are 2-6 cm long, often sparsely covered with fine silky hairs. Both yellow and lilac to purple flowering forms are known; however, the yellow form is more common, except in the north of the species' range. It is capable of tolerating temperatures down to -12°C and living for up to seven years. {{Inc| Lupinus arboreus, Sims. Tree Lupine. Lfts. 7-11. lanceolate-linear, acute, silvery downy below, entire:fls. somewhat verticillate, in tall, loose racemes, sulfur-yellow, fragrant: pods pubescent, 1½ -3 in. long. July-Sept. Common m Calif. Shrub, 4-10 ft. high, somewhat pubescent, not hardy at the north. Var. Snow Queen or Queen of the Snow is pure white. Var. luteus has been advertised. }} ==Cultivation== The yellow-flowering form is widely grown as an [[ornamental plant]] for its attractive yellow flowers and also to bind drifting sand dunes. It has however escaped from cultivation to become an [[invasive species]] in many areas. Outside of its native range in North America, it is somewhat invasive both in southern California, and further north to southwestern [[Canada]]. It has also been introduced in western [[Europe]], [[Australia]] (where it is considered a potential noxious weed), [[New Zealand]], Anatolia [[Aegean Region of Turkey]] and southern [[South America]], including the [[Falkland Islands]]. Like many members of the family [[Fabaceae]], it is an effective [[nitrogen fixation|fixer]] of [[nitrogen]] in the soil. Where it has been introduced, it changes the chemistry of the soil, and therefore allows other exotics to establish themselves, to the detriment of native vegetation adapted to low nitrogen levels. It also [[Hybrid (biology)|hybridizes]] with other lupine species such as ''[[Lupinus littoralis]]'' (seashore lupin) and ''[[Lupinus rivularis]]'' (riverbank lupin), further endangering the survival of those forms. ===Propagation=== <!--- Type propagation info below this line, then delete this entire line --> ===Pests and diseases=== <!--- Type pest/disease info below this line, then delete this entire line --> ==Species== <!-- This section should be renamed Cultivars if it appears on a page for a species (rather than genus), or perhaps Varieties if there is a mix of cultivars, species, hybrids, etc --> ==Gallery== {{photo-sources}}<!-- remove this line if there are already 3 or more photos in the gallery --> <gallery> Image:Arboreus.jpg|Yellow Bush Lupine in flower Image:Upload.png| photo 1 Image:Upload.png| photo 2 Image:Upload.png| photo 3 </gallery> ==References== *[[Standard Cyclopedia of Horticulture]], by L. H. Bailey, MacMillan Co., 1963 <!--- xxxxx *Flora: The Gardener's Bible, by Sean Hogan. Global Book Publishing, 2003. ISBN 0881925381 --> <!--- xxxxx *American Horticultural Society: A-Z Encyclopedia of Garden Plants, by Christopher Brickell, Judith D. Zuk. 1996. ISBN 0789419432 --> <!--- xxxxx *Sunset National Garden Book. Sunset Books, Inc., 1997. ISBN 0376038608 --> ==External links== *{{wplink}} {{stub}} __NOTOC__
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