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

7. Dysphania aristata (Linnaeus) Mosyakin & Clemants, Ukrayins’k. Bot. Zhurn., n. s. 59: 383. 2002.

Chenopodium aristatum Linnaeus, Sp. Pl. 1: 221. 1753

Stems erect, [very bushy-branched] profusely branched from base to ± simple, [0.4-]0.7-2.5[-5] dm, glabrous or with scattered inflated hairs and uniseriate nonglandular trichomes, especially towards base. Leaves non-aromatic; petiole to 0.4 mm; blade [0.8-]2.8-3.4[-4.1] × 0.1-0.3[-0.6] cm, base attenuate, margins entire (to occasionally shallowly erose-dentate) }, apex acute, mucronate, glabrous adaxially. Inflorescences a terminal thyrse, 2.2-4.5[-13] cm, or lax, pyramidal cymes, bearing flowers almost from base; bracts absent. Flowers: perianth segments 5, distinct nearly to base, distinct portions obovate to elliptic or ovate, with low tubercle or sometimes keeled abaxially, 0.5-0.7 × 0.3-0.4 mm, apex obtuse to subacute, glabrous, loosely covering fruit at maturity; stamens 5 (or absent in pistillate flowers in distal portion of inflorescence); stigmas 2. Achenes subglobose; pericarp adherent, membranaceous, finely granular. Seeds subglobose, 0.5-0.8 × 0.4-0.5 mm, margins rimmed; seed coat smooth.

Fruiting late summer-fall. Waste areas, sandy soils; 0-500 m; introduced; Mich., N.Y.; native to Asia; introduced in s, se Europe.


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