Herbs annual, covered with stellate hairs. Stems decumbent, ascending, or erect. Leaves alternate, petiolate; leaf blade flattened, lanceolate to ovate, margin entire. Flowers unisexual (plants monoecious). Male flowers sessile, several glomerulate in axils of upper branches and forming a spike; bracts and bractlets absent; perianth segments 3-5, obovate or elliptic, membranous, densely stellate pubescent abaxially, without appendages; disk absent; stamens 2-5; filaments linear; anthers broadly oblong; ovary rudimentary. Female flowers inserted on petiole of bract; bracts green, elliptic, midvein abaxially prominent; bractlets absent; perianth segments 3 or 4, membranous, without appendages, enlarged in fruit; ovary ovoid; style short; stigmas 2. Fruit a utricle, compressed, ellipsoid or ovoid, glabrous or wrinkled, usually with a crestlike appendage. Seed vertical; embryo semi-annular; radicle inferior; perisperm copious.
Herbs, annual, monoecious, covered with rusty-colored, stellate, and whitish simple trichomes. Stems ascending, not jointed or armed, slender. Leaves alternate, petiolate; blade ovate-lanceolate to narrowly lanceolate, base tapered, margins entire, plane or revolute, apex acute to acuminate. Inflorescences glomerules, cymes, or flowers solitary. Staminate flowers in terminal glomerules or at end of pistillate cymes. Pistillate flowers solitary in upper leaf axils or forming cymes commingled with staminate flowers. Flowers unisexual; staminate with perianth segments 3-5, stamens 2-5; pistillate with bracteoles 2, perianth segments 3-4, stigmas 2, filiform. Fruiting structures persistent, accrescent perianth surrounding utricle; utricles winged, obovate to cuneate, laterally compressed; pericarp adherent. Seeds vertical, ovoid; seed coat grayish, granular; embryo horseshoe-shaped; perisperm copious. x = 9.
"Pistillate fls in short, bracted, panicled spikes terminating the branches; cal of 3 or 4 hyaline sep; ovary compressed, at maturity minutely 2-winged at the summit; styles 2, filiform; staminate fls several to many in a short terminal spike, or solitary or few at the top of the pistillate spikes; sep and stamens 3–5; seed flattened, obovate, closely invested by the very thin pericarp, the embryo horseshoe-shaped, the radicle basal; annual herbs with alternate, entire lvs. 7, Russia and Korea."
|Russian pigweed [Greek axyros (a, not, and xyrios, razor), blunt, not cutting, in reference to the mild taste]|