Males grow to a total length of 66.5 centimetres (26.2 in), females 90 centimetres (35 in). The maximum tail lengths are then 12.5 centimetres (4.9 in) and 14 centimetres (5.5 in) respectively.[7]
Scales in 25-27 longitudinal rows at midbody; 11-13 upper labials, the first partially or completely united with the nasal; supraocular very narrow, sometimes broken into small scales, 12-15 scales between them; head scales small, subequal, tuberculate or granular; temporal scales keeled.[7]
Body color highly variable: above olive, grayish, to dark purplish brown; below whitish, greenish or brown, uniform or spotted with brown; a light line on scale row one bordering ventrals present or absent; head olive, heavily suffused with brown.[7]
Gray, J.E. 1831. Illustrations of Indian Zoology: chiefly selected from the collection of Major General Hardwicke. Vol. 1, London (1830-1835).
Gumprecht, A. 2001. Die Bambusottern der Gattung Trimeresurus Lacépède Teil IV: Checkliste der Trimeresurus-Arten Thailands. Sauria 23 (2): 25-32.
Pope, C.H., & Pope, S.H. 1933. A study of the green pit-vipers of southeastern Asia and Malaysia, commonly identified as Trimeresurus gramineus (Shaw), with description of a new species from Peninsular India. Amer. Mus. Nat. Hist. (620): 1-12.
Smith, M.A. 1943. The Fauna of British India, Ceylon and Burma, Including the Whole of the Indo-Chinese Sub-region. Reptilia and Amphibia. Vol. III.—Serpentes. Secretary of State for India. (Taylor and Francis, Printers.) London. xii + 583 pp. (Trimeresurus purpureomaculatus purpureomaculatus, pp. 520–521.)
Whitaker, R. 1978. Birth Record of the Andaman Pit Viper (Trimeresurus purpureomaculatus) J. Bombay Nat. Hist. Soc. 75 (1): 233.