Stephen Plummer's picture

Knotgrass sp.

Observed: 3rd July 2013 By: Stephen PlummerStephen Plummer’s reputation in PlantsStephen Plummer’s reputation in Plants

Churchyard survey

Species interactions

No interactions present.

Species with which Knotgrass (Polygonum aviculare) interacts


Stephen Plummer's picture

Thanks, David. I didn't know

Thanks, David. I didn't know whether this was an 'agg.' or whether I could record it to species. Would you believe that the plant list for the church now stands at 118 species - not bad for the start of July in year 1 in such a relatively small area!

lavateraguy's picture

There are 2 issues ...

1) this is not Polygonum arenastrum, and the other common inland species is Polygonum aviculare. But there both rarer (P. rurivagum), coastal (P. oxyspermum) and Scottish (P. boreale) species.

2) I understand that there is a reclassification, with more species, in the works. (Mentioned at

So by most current floras, Polygonum aviculare is correct. But I intend to revise all my records of this to Polygonum aviculare agg.

Stephen Plummer's picture

That's really helpful,

That's really helpful, thanks.