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

24. Atriplex saccaria S. Watson, Proc. Amer. Acad. Arts. 9: 112. 1874.

Stalked orach

Atriplex truncata (Torrey ex S. Watson) A. Gray var. saccaria (S. Watson) M. E. Jones; Obione saccaria (S. Watson) Ulbrich

Herbs, erect, forming rounded clumps. Stems mainly 0.5-4(-5) dm; stems usually branched from base, terete, stout, angled; herbage scurfy. Leaves alternate or proximalmost subopposite, short petiolate or distal ones sessile; petiole 2-5 mm; blade cordate-ovate or subreniform to ovate to deltoid-ovate or oval, mainly 6-40 × 4-30 mm, base truncate to subcordate or broadly cuneate, margin entire or in some subhastately lobed or sometimes undulate-dentate, apex acute to rounded. Staminate glomerules in distal axils or in short, naked, terminal (early deciduous) panicles; flowers with 5-parted calyx. Pistillate flowers usually in fascicles of 1-3 in proximal axils. Fruiting bracteoles monomorphic or dimorphic, larger ones on stipes (2-)4-8(-15) mm, others sessile, united at base, round-triangular or suborbicular, 4-6 mm, irregularly and coarsely dentate and with ± densely beset with flat, cristate, or hornlike appendages, smaller bracteoles (lacking or rare in var. asterocarpa) in same axils, oblong to cuneate, 3-4 mm, apex truncate, dentate only at summit, faces smooth. Seeds brownish to whitish, 1.5-2.3 mm. 2n = 18.

Varieties 3 (3 in the flora): w United States.

1 Leaves mainly ovate to cordate in profile, the distalmost bracteate ones (and sometimes all) often broadly so in age; fruiting bracteoles with stipes to 10 mm, but seldom exceeding 6 mm; Arizona, New Mexico, Wyoming, s to Texas   24a var. saccaria
+ Leaves oval to rhombic, the bases truncate to cuneate-attenuate; fruiting bracteoles with stipes of various length; sw Utah and adjacent states   (2)
2 (1) Leaves oval to suborbiculate or less commonly elliptic; fruiting bracteoles with hornlike appendages, borne on stipes mainly 2-6 mm   24c var. asterocarpa
+ Leaves rhombic to oval or triangular, base cuneate-attenuate; fruiting bracteoles with flattened processes, borne on stipes mainly 2-15 mm (sessile in some)   24b var. cornuta


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