Flora of the Southeastern United States
2022 Edition

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Key to Atriplex

1 Leaves white to gray, densely and finely scurfy, especially on the upper surface.
..2 Seeds dimorphic, black and brown; branches not angled; [introduced, of disturbed situations]; [subgenus Atriplex, section Semibaccata]
..2 Seeds monomorphic, brown; branches obtusely angled; [native, of coastal saline situations]; [subgenus Obione, section Obione, subsection Arenariae].
....3 Fruiting bracteoles (3.5-) 4.5-7 mm long, 3.5-5.6 mm wide, longer than broad; faces with or without appendages
....3 Fruiting bracteoles 2.5-4.5 mm long, 2.6-5 mm wide, as wide as or wider than long; faces with appendages
1 Leaves usually green on both surfaces, glabrous or only sparingly powdery or scurfy; [subgenus Atriplex, section Teutliopsis].
......4 Fruiting bracteoles not thickened with spongy tissue.
........5 Bracteoles rhombic to diamond-shaped, broadly cuneate at the base; brown seeds broadly elliptic, (1.5-) 2.1-3.0 mm wide; seed radicle lateral; [of saline coastal habitats]
........5 Bracteoles triangular, nearly truncate across the bottom; brown seeds round, 2.5-3.1 (-3.7) mm wide; seed radicle subbasal; [primarily ruderal, of inland situations]
......4 Fruiting bracteoles thickened with spongy tissue, especially toward the base.
..........6 Seeds ellipsoid, wider than long; leaves thickened in texture
..........6 Seeds disc-shaped, as wide as long; leaves thin in texture.
............ 7 Lower leaves linear or ovate-lanceolate; brown seeds 2.0-2.8 mm wide; black seeds 1.5-2.0 mm wide; [of MD and PA northward]
............ 7 Lower leaves triangular-hastate; brown seeds 1.0-2.5 mm wide; black seeds 1.0-1.5 mm wide; [widespread in our area, primarily in the outer Coastal Plain]