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Alpine Garden Society Plant Encyclopaedia
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Botanical Description

Stems 25-45cm in height, hairless. Leaves 6-12cm long, pinnatifid with toothed segments. Flowers almost 2cm long, pale yellow, in spike-like racemes, summer to autumn. P.p. var. purpurea has purple flovwers. North-western North America; Rocky Mountains to Idaho and Montana south to New Mexico and Arizona.