West Highland Flora

Common Knotgrass

Polygonum aviculare


Polygonum aviculare

Photo Carl Farmer
18 Aug 2002 Scorrybreac

Frequent on bare ground, especially around farmyards and on the inner edge of road verges, but much confused with other species such as P arenastrum.

Flower diameter c 2 mm

ID: Fruit no longer than 3.5 mm and not protruding from flower.  Leaves on main stem much larger than those on flowering branches.  Leaf-stalks not or hardly longer than their stipules (ochreae).

Other features: Upright or semi-upright, unlike Ray's Knotgrass.  Nut has three equal sides, not two broad and one narrow as in P arenastrum.

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