Stems simple, erect, much-branched, rigid, terete, up to 1 m. or sts 2 m. tall; branches reddish, glabrate to sparingly pubescent. Lvs sessile or nearly so, rather distant, opp. except in floral region. Lamina ovate-to narrow-lanceolate, attached by broad base, subpatent, 35-65-(90) × 8-15 mm., membr., glab. except sts on margins and main nerves; margins closely to rather remotely denticulate. Infl. us. ample; fls ∞, ± 5 mm. diam.; calyx deeply divided, ± pubescent to pilose, lobes narrow-lanceolate, ± 4 mm. long; petals magenta or paler, 5-6·5 mm. long, shortly 2-lobed. Capsules 50-60-(75) mm. long, finely and evenly pubescent to almost pilose; peduncles ± 6 mm. long, pubescent. Seeds papillose.