Staurogyne arunachalensis (Acanthaceae), a New Species from Arunachal Pradesh, India

Staurogyne arunachalensis R.Kr. Singh, D. Borah & Yama (Acanthaceae), a new species from the Eastern Himalayan state Arunachal Pradesh, India, is described and illustrated. It resembles S. argentea in having a very short stem, basally clustered leaves and in lacking a staminode, but differs from it by its longer peduncle and rachis; smaller, linear-subulate, 1-nerved, non-aristate bracts; smaller, acute, non-aristate bracteoles; smaller, 1-nerved, acute, non-aristate calyx; and longer, pubescent, pinkish-red corolla.