Abstract

Scleria parvula subsp. tumanganica is described as a new subspecies from the Russian Far East. A description and digital images of the whole plants, nutlets, and inflorescence are here presented. The new subspecies differs from the type subspecies by subrounded disc-lobes, distinctly not separated, margin entire, not reflexed, and rounded shallow sinuses. Also, it is characterized by an isolated geographical range. The disjunction of S. parvula subsp. tumanganica range in Primorsky Krai from the finds of S. parvula in the central parts of Honshu Island, Japan, and North Gyeonggi Province, Republic of Korea, constitutes of 700–900 km. This new taxon resembles S. rugosa, S. mikawana, S. novae-hollandiae, S. thwaitesiana, and S. tessellata in habit, structure of inflorescence, nutlet size and shape, and disc form and its lobes. A comparative study of these species has been carried out. We uphold the recognized taxa S. parvula and S. tessellata as species, and provide an identification key.