Distribution
Ukraine

Plants annual, light green or yellowish green, in October-November sometimes becoming darker green, sparsely covered with whitish (on young leaves often golden or golden-pinkish) mealy indumentum, becoming subglabrous at maturity. Main stem erect, 10–110 (–130) cm tall, normally branched above the base, less commonly with branches almost near the base, or rarely (in underdeveloped plants growing in dense stands) branched only in the inflorescence. Stem and branches striate, with alternating dark green and light green stripes, at nodes becoming reddish or with beet-red spots. Lower and middle primary branches usually spreading almost horizontally, forming with the main stem an angle almost approaching 90° (occasionally lower branches, if close to the plant base, arcuate or ascending); upper branches spreading, ascending to suberect, at maturity in inflorescence with distal ends often nodding, usually thin and fragile (thicker in plants growing in open places). Leaves (when fully developed) normally long-petiolate, with petiole often almost as long as lamina, or shorter than lamina in upper leaves and longer than lamina in lower leaves; leaf blades usually thin and soft (somewhat thicker in plants growing in open places), rather variable in shape (in particular, depending on vegetation phases and growing conditions). Lower and middle cauline leaves with leaf blades (3–)4–8 (–10) cm long and (1–) 2–4 (–6) cm wide, more or less distinctly trilobate (or sometimes almost ovate in outline), lateral lobes located in basal 1/3 or 1/2 of leaf blade; base cuneate to broadly cuneate; apex obtuse to subacute; margins undulate, crenate or obtusely dentate. Upper cauline leaves becoming gradually smaller on the plant upward, indistinctly trilobate or subhastate to ovate-lanceolate or lanceolate, apex mainly subacute, margin with a few teeth to subentire or entire. Young leaves with whitish or often golden or goldenpinkish mealy indumentum above. Inflorescence usually thin and lax, partial inflorescences moniliform or nearly so, with flowers arranged in small few-flowered remote glomerules, some flowers solitary. Perianth segments (tepals) 5, green to yellowish-green, distal ("back") side more or less distinctly keeled, at least in some flowers; tepals normally only partly cover fruits at maturity. Fruits usually ca. (0.9–) 1.0–1.3 (–1.4) mm in diameter; pericarp not easily removed when rubbed, in dry state with distinct sculpture; seeds rather variable in color (heterospermy): whitish, ivory- or yellowish-white when immature, most of them becoming reddish-brown, brown or almost black at maturity, equatorially rather distinctly keeled; testa almost smooth, with shallow depressions and grooves extended to equatorial zone. Seeds horizontal, embryo circular. B-genome diploids with 2n=18.

Mosyakin S.L., Mandák B., 2020. Chenopodium ucrainicum (Chenopodiaceae / Amaranthaceae sensu APG), a new diploid
species: a morphological description and pictorial guide. Ukrainian Botanical Journal, 77(4): 237–248.