Persicaria lapathifolia subsp. nodosa is recorded for the first time for the flora of Iran. Morphological variation of
this taxon in Iran has been studied. This subspecies differs from P. lapathifolia subsp. lapathifolia by having
densely glandular peduncles and leaves with golden glands beneath. The most characteristic features of this
subspecies are presence of red spots on the stem and having smaller and lax spikes
