Dysophylla tetraphylla Wight; Mentha quadrifolia D. Don; Pogostemon cruciatum (Bentham) Kuntze.

Herbs annual. Stems erect, 18-45 cm tall, sometimes branched from base, yellow strigose, lower internodes short. Leaves sessile, obliquely spreading, in whorls of 4, linear, 1.3-3.5 cm × 2.5-4 mm, papery, strigose, base broad, margin entire and strongly revolute, apex acute. Spikes 1.5-10 cm × 7-8 mm, compact; bracts linear to narrowly lanceolate, as long as calyx to longer than corolla, gray strigose, gray-purple. Calyx ca. 1.5 × 1.2 mm, villous outside; teeth ovate-triangular, ca. 1/3 as long as calyx tube. Corolla ca. 2 × as long as calyx, purplish red, ca. 4 mm, villous outside, limb subequally 4-lobed. Stamens much exserted. Nutlets dark brown, minute, shiny. Fl. Sep-Nov, fr. Nov.

Marshy areas, waste areas; 1100-1500 m. Yunnan [Cambodia, India, Laos, Nepal, Vietnam].