FIELD ID CHARACTERISTICS:
Square stem heavily armed with unmistakable briars that can tear flesh, hence the common name.
Synonym(s): Polygonum sagittatum, Tracaulon sagittatum, Truellum sagittatum
Description: Trailing, perennial herb up to 2 m long with weak intertwining branches.
Leaves: Simple, entire, alternate, arrow-shaped leaves with acute tips. Leaf midribs contain spines.
Flowers/Fruit: Tiny flowers are white to pink, clustered on ends of stalks emerging from base of leaves. Flowers and fruits May to November.
Habit and Range: Freshwater marshes, wet fields and disturbed areas across North Carolina.