Annual or short-lived perennial slender herb, 1—3 m tall, with easily uprooted c. 100 mm long taproot; stem branched at upper nodes only, green, shortly pubescent, deeply 4-furrowed apically; upper nodes with a tuft of 1—4 mm long hairs; internodes 20—150 mm long, in the inflorescence 70—280 mm. Leaves petiolate; blade broadÂly ovate, 50-200 x 40-150 mm, apex acuminate, base cuneate-attenuate to cordate-attenuate, margin deeply crenate with 25—51 teeth/leaf, green, pubescent and with colourless glands; petiole 30—80 mm long. Inflorescence of 2—5 spherical to cylindrical verticils 38—65 mm in diameter, with 20—28 verticil branches 2—16 mm long; pedicels 0,5—2 mm long; bracts 25—90 x 4—13 mm, linear; petiole 12—60 mm long; bracteoles stout, linear, 7—15 x 0,5 — 1,5 mm, acuminate. Calyx 17—25 mm long, 4—5,6 mm in diameter, bilabiate, bent forwards, shortly pubescent, basal half stiff, yellowish white, distal half flexible, green; calyx teeth straight, stiff, apiculate, the dorsal one 4—7 mm long, the others 1—3 mm long. Corolla 19—38 mm long, tube 9—20 mm long with three distinct rings of hairs inside the tube. Fresh pollen pale yellow. Nutlets 2,9-4,3 x 1,1-1,9 mm, surface not glossy, marmorated in grey and brown. Fig. 9:3.
