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

23. Chenopodium incanum (S. Watson) A. Heller, Pl. World. 1: 23. 1897.

Chenopodium fremontii S. Watson var. incanum S. Watson, Proc. Amer. Acad. Arts 9: 94. 1874

Stems erect to spreading, branched from base or simple, 0.6-7.5 dm, farinose. Leaves nonaromatic; petiole 0.5-1 cm; blade broadly triangular to broadly ovate, distal leaves narrowly triangular to narrowly ovate, 1-1.5(-2.3) × 0.5-1.6 cm, thin or thick, base cuneate to subtruncate, margins usually with two basal teeth or lobes, teeth or lobes acute to acuminate, obtuse, or rounded, apex rounded, obtuse, or acute, farinose abaxially. Inflorescences glomerules in terminal and lateral panicles, 3.5-12 × 1-7 cm; glomerules maturing mixed; bracts absent. Flowers: perianth segments 5, distinct nearly to base; lobes ovate, 0.8-1.1 × 0.7-1 mm, apex acute to obtuse, keeled or not, farinose, completely covering fruit at maturity; stamens 5; stigmas 2, 0.2 mm. Utricles ovoid; pericarp nonadherent, smooth. Seeds round, 0.9-1.25 mm diam., margins rounded with a narrow rim; seed coat dark black, wrinkled. 2n = 18.

Varieties 3 (3 in the flora): w North America.

1 Plants densely branching from base, branches spreading to ascending, 0.6-1.5(-3) dm; leaf blade apices and basal teeth.   23a var. incanum
+ Plants erect or spreading, unbranched or branching from base with erect ascending branches, 1-2.5 dm; leaf blade apices and basal teeth rounded, obtuse, or occasionally acute   (2)
2 (1) Plants erect or spreading, 1-3.5 dm....   23b var. occidentale
+ Plants erect, 2.5-7.5 dm....   23c var. elatum


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