Patchouli. Also known as earth patchouli, rows of grass, large leaf mint, tulipa incense, cat's tail incense, mountain fennel, watery leaves and so on. Labiatae patchouli perennial herb. Stem erect, 0.5-1.5 meters high, 4-angled, the upper part is very short fine hairs, the lower part is glabrous, in the upper part with fertile branches. Leaves cordate-ovate to oblong-lanceolate, tapering upward, apex caudate-long acuminate, base cordate, sparsely truncate, margin coarsely dentate, papery, olive-green above, subglabrous, slightly paler below, puberulent and punctate-glandular; verticillasters many-flowered, forming terminal crowded, cylindrical spikes on main stems or lateral branches; verticillasters shortly pedunculate, glandular puberulent. Calyx tubular-obconic, glandular puberulent and yellow glandlets, ± tinged light purple or purple-red, throat slightly oblique, calyx teeth triangular-lanceolate. Corolla light purple-blue, puberulent outside, slightly beyond calyx, tapering upward to throat ca. 3 mm wide, limb 2-lipped, upper lip straight, apex emarginate, lower lip 3-lobed, middle lobe broader, ca. 2 mm long, ca. 3.5 mm wide, spreading, margin undulate, base broad, lateral lobes semiorbicular. Stamens projecting from corolla, filaments fine, flattened, glabrous. Style subequal to stamens, filiform, apex equally 2-lobed. Disk thickly annular. Ovary lobes apically tomentose. Mature nutlets ovate-oblong, ventrally angled, apex hispidulous, brown. Flowering June-September, fruiting September-November.