William Curtis, The Botanical Magazine, Vol. 08
“ The oldest plant in our possession is about a foot and a half high, much branched, the stalks are round and smooth to the naked eye, green below, above purplish, the leaves are smooth, a deep bright green colour, alternate, standing on footstalks, which gradually widen into the leaves, somewhat ovate, and deeply toothed; the flowers grow in the alæ of the leaves, forming a thin spike, they are sessile, of a pale violet colour, and have a peculiar smell which is rather unpleasant ”
