Collinsonia canadensis

From the Eastern USA, this member of the mint family has citronella scented flowers and foliage (when bruised). An herbaceous plant 1m to 1.3m tall, with broad foliage and terminal pyramidal inflorescences of small soft-yellow flowers in September. An important medicinal herb, the foliage can also be used to make a tea. A woodland plant in nature, often, but not always, on limestone.