Amomum riwatchii (Zingiberaceae): a new species from northeastern India

Amomum riwatchii, a new species of Zingiberaceae from northeastern India is described and illustrated. It is similar to A. carnosum, but differs from the latter in having non-stoloniferous rhizome, oblong lanceolate lamina, 5-6 mm long ligule with entire apex, broadly ovate or orbicular dark red thick outer bract, calyx lobes with cuspidate or horned apex, oblong labellum with entire apex and non-winged capsule.