Chenopodium album complex
(C. Album)

Lamb's-Quarters

Leaf Bottom
Regina
17-July-2002

Note the scarcely mealy surface.

The Flora of Canada describes a Chenopodium album complex containing six "microspecies", with C. album as the type.  One of these microspecies, C. berlandieri = C. dacoticum, is considered a separate species by Flora of Alberta.  The plant depicted here is C. Album.

Flora of Alberta distinguishes C. berlandieri from C. album according to:

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Album Characteristics
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leaves green above, mealy beneath

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blades ovate to lanceolate, usually with several teeth along each side

 

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Berlandieri Characteristic
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leaves yellowish green, densely white-mealy

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blades ovate to rhombic, entire or sinuate

The rest of the points in the keys leading to Chenopodium album are as follows:

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Album Characteristics
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leaves small, linear to ovate, entire or with small teeth or lobes; NOT large, broadly ovate, with 2 or 3 large triangular lobes or teeth on each side

 

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Chenopodium Characteristics
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plants neither spiny nor with spine-tipped leaves

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plants may be glabrous, scurfy or pubescent; but NOT with long, soft hairs

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leaves slender, elongate, mostly alternate; NOT scale-like, opposite

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leaves not circular in cross section

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leaves not fleshy, sometimes linear but usually wider, flat, often toothed or lobed, usually scurfy or pubescent

 

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Chenopodiaceae Characteristics
(Not all these points apply to all genera in Chenopodiaceae, but they all do apply to genus Chenopodium.)
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leaves without stipules

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leaves not compound and not very deeply divided

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leaves not orbicular or reniform