CHENOPODIACEAE 385 
b. Foliage and inflorescence green and glabrous at least at maturity. 7. C. Boscianum. 
B. Embryo horseshoe-shaped, forming an incomplete ring: plants glandular and 
aromatic. 
Leaf-blades pinnately lobed. 8. C. Botrys. 
Leaf-blades entire, undulate or coarsely toothed. 
Spikes conspicuously leafy-bracted. 9. C. ambrosioides. 
Spikes nearly naked or minutely bracted. 10. C. anthelminticum. 
1. Chenopodium álbum L. Annual, pale green. Stemserect, 6-30 dm. tall, striate 
or grooved at maturity, normally widely branched, firm : leaf-blades ovate to lanceolate 
or linear-lanceolate, more or less rhombic, 2-8 cm. long, acute or obtuse, sometimes 3-lobed, 
mostly serrate throughout the plant, cuneate at the base, slender-petioled : flower-clusters 
contiguous or interrupted, dense: sepals mealy, pale-margined, acute, keeled: utricle 
depressed, 2-2.5 mm. broad, enclosed in the calyx: seed horizontal, black, shining, 
adherent to the pericarp. 
In waste places and thickets, throughout North America except the extreme north. Naturalized 
from Europe. Spring to fall. LAMB'S QUARTERS. 
2. Chenopodium víride L. Annual, bright green. Stems erect, 4-12 dm. tall, 
branched, ridged : leaf-blades ovate to lanceolate or linear-lanceolate, acute or slightly 
acuminate, entire at least above or usually coarsely toothed below the inflorescence, acute or 
cuneate at the base, glabrous on both sides or sparingly mealy beneath especially when 
young, slender-petioled : flower-clusters contiguous or interrupted, rather laxly disposed : 
sepals mealy-pubescent, acute, barely keeled : utricle depressed, 2-2.5 mm. broad: seed 
about 1.5 mm. broad, firmly attached to the pericarp. 
In waste places, throughout North America except the extreme north. Naturalized from Europe. 
Spring to fall. LAMB'S QUARTERS. 
3. Chenopodium Berlandiéri Moq. Annual, sparingly mealy or glabrous in age. 
Stems erect, 3-9 dm. tall, commonly much branched, ridged : leaf-blades thinnish, lanceo- 
late, oblong or ovate, often somewhat rhombic, 1.5-4 cm. long, acute or cuspidate, entire 
or sinuate, often cuneate at the base ; petioles slender, nearly as long as the blades or much 
shorter: flower-clusters continuous or interrupted, often subglobose: sepals more or less 
densely mealy, ovate or oblong-ovate, rather obtuse, keeled : utricle depressed, 1.5-2 mm. 
broad, enclosed in the calyx : seed horizontal, firmly adherent to the pericarp. 
In dry soil, Missouri to Texas and in Florida. Summer and fall. 
4. Chenopodium muràle L. Annual, glabrous or barely mealy, deep green. Stems 
erect or decumbent, 1-6 dm. long, mostly widely branched : leaf-blades thinnish, rhombic- 
ovate, 2-8 cm. long, acute, sinuate-dentate or incised-serrate, cuneate or nearly truncate at 
the base; petioles slender, as long as the blades or shorter: flower-clusters small, often 
separated at maturity : sepals slightly mealy, oblong or ovate-oblong, obtuse, not keeled : 
utricles depressed, 1.5-2 mm. broad, partly enclosd in the calyx : seed horizontal, firmly 
adherent to the pericarp, the edges sharp. 
In waste places, Maine to British Columbia, Florida and Mexico, naturalized from Europe. Sum- 
mer and fall. 
5. Chenopodium leptophyllum (Moq.) Nutt. Annual, mealy-pubescent. Stems 
decumbent in age, 2-9 dm. long, more or less branched, striate or grooved at maturity : 
leaf-blades mainly linear, sometimes rather broadly so, 1-3.5 em. long, entire, or repand on 
the lower part of the stem, pale green above : flowers in contiguous or interrupted clusters : 
sepals mealy, oblong or nearly so, keeled, obtuse : utricle depressed, 1.5 mm. broad, nearly 
enclosed in thecalyx : seed horizontal, black, smooth and shining, free from the pericarp. 
_In sandy soil, Connecticut to New Jersey, also from Manitoba and the Northwest Territory to Mis- 
souri, Texas and Arizona. Summer and fall: 
6. Chenopodium albéscens Small. Annual, pale green. Stems erect, 8-12 dm. tall, 
relatively stout, mealy when young, prominently pale-ridged : leaf-blades mainly ovate, 
some of the upper ones narrower, 2-4 cm. long, sharply acute or minutely bristle-tipped, 
nearly all angulately lobed or toothed, permanently mealy at least beneath, 3-nerved, 
cuneate at the base, slender-petioled : flower-clusters continuous or becoming interrupted, 
relatively slender, whitish : sepals mealy, ovate, barely keeled: utricle depressed, 1-1.5 
mm. broad, included : seed horizontal, black, shining, free from the pericarp. 
In dry soil, Kerrville, Texas. Spring and summer. 
7. Chenopodium Bosciànum Mog. Annual, light green. Stems erect, 3-9 dm. 
tall, striate, rather widely branched: leaf-blades thinnish, 1-3 cm. long, acute, entire, or 
sinuate near base of stem, green on both sides, cuneate at the base ; petioles slender, about 
3 as long as the blades : racemes or panicles slender, loosely flowered : sepals herbaceous, 
oblong or oval, 1-1.5 mm. long, scarious-margined, flat or barely keeled at maturity : 
utricle depressed, about 1 mm. broad, nearly enclosed in the calyx : seed horizontal, easily 
separable from the pericarp, black, shining. 
In open woods and thickets, New York to Minnesota, Georgia and Texas. Summer. 
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