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Also known as Annual Nettle.
How do you tell a small from a common, I ahve always wondered? And are small nettle as common?
As the alternative name states this is an annual with a simple root system. It is shorter to 60 cm. The perennial nettle has extensive yellow running stolons/rhizomes underground. It is taller to 200 cm or more.
Stace 3 p. 285:
Terminal leaf tooth longer than the adjacent laterals U. dioica
Terminal leaf tooth about as long as the adjacent laterals U. urens
Lat/Lng: 52.1416, -0.052
OS grid ref: TL334510