*Fu H Y, Chen S J, Chen R F, Ding W H, Kuo-Huang L L, Huang R N (2006). Identification of oxalic acid and tartaric acid as major persistent pain-inducing toxins in the stinging hairs of the nettle,Urtica thunbergiana. It may also have a white bump(s)that will maybe spread a little. Annals of Botany (London), 98:57-65. Abstract
