Ten new species of Umbelliferae are described from Bhutan, Nepal and Sikkim: Cnidium atropurpureum M.F. Watson, Cortiella lamondiana Fullarton & M.F. Watson, Heracleum bhutanicum M.F. Watson, H. woodii M.F. Watson, Keraymonia pinnatifolia M.F. Watson, Schulzia bhutanica M.F. Watson, Sinocarum longii M.F. Watson, S. minus M.F. Watson, S. pulchellum M.F. Watson and S. woodii M.F. Watson. Two new combinations are made: Cortiella cortioides (C. Norman) M.F. Watson and Meeboldia digitata (Kljuykov) M.F. Watson.