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Narthecium ossifragum

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Narthecium ossifragum, commonly known as bog asphodel,<ref name=BSBI07>Template:Cite web</ref> Lancashire asphodel or bastard asphodel,<ref name=":0">Template:Cite web</ref> is a plant of Western Europe, found on wet, boggy moorlands up to about 1000 m in elevation. It produces spikes of bright yellow flowers in summer. The bright orange fruits have been used as a colourant to replace saffron by Shetland Islanders.<ref name="Richard Mabey Flora Britannica">Richard Mabey Flora Britannica</ref> Despite the plant's English name, it is not particularly closely related to the true asphodels. In addition to other forms of pollination, this plant is adapted to rain-pollination<ref name=pollin/>

The Latin specific name means "bone-breaker", and refers to a traditional belief that eating the plant caused sheep to develop brittle bones. The probable origin of this story is that sheep eating a calcium-poor diet are likely to develop bone weakness, and N. ossifragum favours acidic low-calcium soils.<ref name="Richard Mabey Flora Britannica"/>

The plant can cause photosensitisation, a serious skin condition of sheep called alveld, "elf fire", in Norway. It can be relieved by moving stock into shade. Not all stands of the plant are toxic, and the toxicity may be the side effect of the plant's response to a fungal infection.<ref>Handbook of Plant and Fungal Toxicants by J. P. Felix D'Mello</ref><ref>George B. B. Mitchell, 'Non-parasitic skin diseases of sheep' In Pract., Vol. 10, Issue 2, 69-73, March 1, 1988</ref><ref>Arne Flåøyen, 'Studies on the aetiology and pathology of alveld'</ref>

It can be found in purple moor grass and rush pastures.<ref name=":0" />

It is tufted, hairless perennial. The leaves are narrow.<ref>Template:Cite book</ref>