Subshrubs; stems erect or sometimes ascending, strongly quadrangular or winged, the 2 angles or wings below the stipules more developed than other angles or wings, ca. 3-6 dm long, glabrous.
Leaves usually paler on lower
surface, usually abruptly reduced above, thin, chartaceous or membranous, elliptic, elliptic-obovate, elliptic-ovate, or sometimes lanceolate, often slightly asymmetrical, (6-)8-18(-22) cm long, (1-)2.5-6.5(-7) cm wide, lateral veins few, widely spaced, visible but not conspicuous, slightly or not at all raised on lower surface, higher order venation obscurely reticulate, glabrous, apex acuminate to long-acuminate, base attenuate, petioles ± slightly winged, 0-1(-1.5) cm long, base connate into a sheath, stipules deltate, 5-14 mm long, adnate to petiole sheath, apex with a slender mucro (2-)4-11 mm long.
Flowers perfect and pistillate, in terminal, compound, monochasial cymes, forming a lax, paniculate inflorescence up to 30 cm long, branches lax or pendent, occasionally not monochasial and forming a stiffer thyrsoid panicle, inflorescences glabrous, ± glaucous throughout, bracts of ultimate branches small, scale-like, pedicels quadrangular, ca. 3-4 mm long; hypanthium turbinate, 1-1.5 mm long; calyx lobes narrowly ovate to lanceolate, 1.5-3(-5) mm long, ca. 1-2 mm wide, enlarging somewhat in fruit; corolla greenish white, fleshy, salverform, glaucous, the tube 5-14 mm long, larger corollas slightly enlarged distally, the limb not strongly quadrangular in bud, but apex depressed, the lobes ca. 1-4 mm long at anthesis, flat, strongly inflexed in bud; stamens inserted ca. 1-3 mm below corolla lobe sinuses; style glabrous to hirtellous or long-villous in lower 1/2, apex 2-lobed.
Capsules turbinate to turbinate-subglobose, 2-3 mm long, 3-4 mm in diameter, dehiscing loculicidally across disk, pyrenes tardily dehiscing across disk and slightly further septicidally, endocarp thinly sclerified, disk slightly raised.
Seeds dark brown, ± cuneiform, irregularly bluntly angled, minutely dark granular.