1. Seeds
vertical or both horizontal and vertical; leaf blades glabrous or occasionally
farinose (4)
Seeds all
horizontal; leaf blades usually farinose (9)
4. Leaf
blades lanceolate or oblong, glaucous abaxially C.
glaucum (Oak-Leaf Goosefoot) C
Leaf blades triangular or rhombic, rarely lanceolate, green abaxially (6)
6.
Glomerules 3-10 mm diameter, sessile on unbranched terminal and occasionally
axillary spikes; perianth segments fleshy, red at maturity (not fleshy but often
red in C. capitatum var. parvicapitatum);
seeds all vertical
C.
capitatum
(Strawberry Blite) C
Glomerules 2-5 mm diameter, sessile
on lateral branched spikes; perianth segments membranaceous, green at maturity;
horizontal and vertical seeds both present C.
rubrum (Red Goosefoot) C
9. Flowers
individually disposed in panicles; leaf blades glabrous (10)
Flowers in loose or dense glomerules; leaf blades usually farinose (11)
10. Leaves
sinuate-dentate; seeds 1.3-1.9 mm diameter C.
simplex (Maple-Leaf) Goosefoot) C
Leaves entire; seeds 0.8-1.3 mm diameter C.
polyspermum (Many-Seeded Goosefoot) R/ADV?
11.
Primary leaves linear, linear-lanceolate, or occasionally narrowly oblong-ovate,
2-3 times longer than broad or longer; usually without teeth or lobes or
occasionally with a pair of basal lobes (12)
Leaves
ovate, rhombic, triangular, or lanceolate, to 2 times longer than broad; usually
with basal lobes and often with additional teeth on margin (22)
12.
Leaves with 1 vein, blades linear, usually somewhat fleshy, margins entire (13)
Leaves with 3 veins from
base, blades linear, lanceolate, or occasionally narrowly oblong-ovate or
triangular-rhombic, usually without teeth or lobes or occasionally with a pair
of basal lobes (16)
13. Fruit an
utricle, pericarp separable; plant mostly not farinose C.
subglabrum (Smooth Goosefoot) THR
Fruit an achene, pericarp attached; plant mostly farinose C.
leptophyllum (Narrow-Leaved Goosefoot) UC
16. Leaves 3
times longer than broad or longer (17)
Leaves 2-3 times longer than broad, usually narrowly oblong-ovate or deltoid
rhombic (20)
17. Fruit an
achene, pericarp attached, minutely granular-roughened; seeds flattened on top C.
hians (Gaping Goosefoot) THR
Fruit an utricle, pericarp separable; seeds rounded on top (18)
18. Perianth
spreading from fruit at maturity; plants strictly erect C.
pratericola (Desert Goosefoot) CC
Perianth enclosing fruit at maturity; plants erect to spreading C.
desiccatum (Arid-Land Goosefoot) UC
20. Fruit an
utricle, pericarp separable; leaf blades entire C.
atrovirens (Dark-Green Goosefoot) End
Fruit an achene, pericarp attached; leaf blades often toothed C.
strictum (Upright Goosefoot) UC
22. Seeds
honeycomb-pitted (23)
Seeds smooth or areolate (26)
23. Lower
leaves entire or with only 1-2 teeth or lobes near base C.
watsonii (Watson's Goosefoot) VUL
Lower leaves serrate and usually lobed C.
berlandieri (Pit-Seed Goosefoot) CC
26. Leaves
triangular (27)
Leaves ovate to broadly ovate, rhombic, or lanceolate, variously lobed or
toothed (30)
27. Leaf
blades toothed and sometimes with basal lobes, usually glabrous C.
murale (Nettle-Leaved Goosefoot) VER?
Leaf blades with basal lobes but no additional teeth, usually farinose (29)
29. Plants
simple below, branching above; seeds 1-1.3 mm diameter C.
fremontii (Fremont's Goosefoot) C
Plants profusely branching from base; seeds 0.9-1.1 (-1.2) mm diameter C.
incanum (Mealy Goosefoot) THR
30. Leaf
blades without teeth except for often present basal lobes or teeth C.
atrovirens (Dark-Green Goosefoot) End
Leaf blades with lateral teeth and often basal lobes (36)
36. Leaf
margins tapering to an acute apex; leaves ovate, rhombic, or lanceolate;
inflorescence branched spicate or cymose C.
album (Lamb's-Quarters) C
Leaf margins more or less parallel below the
obtuse apex, leaves lanceolate to narrowly elliptic; inflorescence normally
moniliform, not profusely branching C.
strictum (Upright Goosefoot) UC
