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FNA | Family List | FNA Vol. 4 | Chenopodiaceae | Chenopodium

10. Chenopodium polyspermum Linnaeus, Sp. Pl. 1: 220. 1753.

Stems erect or decumbent, branched, 1.5-5(-10) dm, glabrous. Leaves nonaromatic; petiole to 1.7 cm; blade ovate to elliptic or oblong, 1.5-4(-8) × 0.4-2.5 cm, base rounded to cuneate, apex obtuse to rounded or acute, glabrous. Inflorescences lateral cymes, sometimes terminal and axillary spikelike panicles; bracts absent or leaflike and gradually reduced in size distally. Flowers: perianth segments 5, distinct nearly to base, lobes elliptic to oblong, 0.7-1 × 0.5-0.8 mm, apex obtuse or rounded, not keeled, glabrous, not covering fruit at maturity; stamen 1; stigmas 2, 0.1 mm. Utricles depressed-ovoid; pericarp nonadherent, smooth. Seeds 0.8-1.3 mm diam.; seed coat brown-black, dull. 2n = 18.

Varieties 2 (2 in the flora): introduced; Europe, n Asia.

1 Plants spreading to suberect; inflorescences lax, cymose, axillary; leaf blade apices usually obtuse, green or yellowish green.   10a var. polyspermum
+ Plants upright; inflorescences condensed, spiciform, terminal and axillary; leaf blade apices usually acute, becoming red at maturity.....   10b var. acutifolium


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