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. Bolrys. 



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 album L. Annual, pale green. Stems erect, 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 viride 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 Berlandi&ri 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, ratlier 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 murale 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 leptophylkim (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 cm. long, entire, or repand on 



the lower part of the stem, pale gj-een above : flowers in contiguous or interrupted clusters : 



sepals mealy, oblong or nearly so, keeled, obtuse : utricle depressed, 1.5 mm. broad, nearly 



enclosed in the calyx : seed horizontal, black, smooth and shining, free from the pericarp. 



In sandy soil, Connecticut to New Jersey, also from Manitoba aud the Northwest Territory to Mis- 

 souri, Texas and Arizona. Summer and fall. 



.6. Chenopodium albescens 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, shar{)ly acute or minutely bristle-tipped, 

 nearly all angulately lobed or toothed, permanently njealy at least beneath, 3-nerved, 

 cuneate at the base, slender-petioled : floAver-clusters continuous or becoming interrupted, 

 relatively slender, whitish : sejaals 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 Boscianum Moq. Annual, light green. Stems erect, 3-9 dm. 

 tall, striate, rather widely In-anched : leaf-blades thinnish, 1-3 cm. long, acute, entire, or 

 sinuate near base of stem, green on both sides, ctineate at the base ; petioles slender, about 

 J 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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