CHENOPODIACEAE l^i^ 



Lower surface of the leaf -blades decidedly mealy : inflorescence dense. 



I. C. albiun. 



Lower surface of the leaf-blades glabrous or glabrate : inflorescence lax- 

 Panicles leafy-bracted. 2. C. viride. 

 Panicles naked. 3. C. hybridum. 

 tt Flowering branches shorter than the accompanying leaves: rnature 

 sepals not keeled. 



Leaf-blades relatively narrow, entire. 4. C. polyspermnm. 



Leaf-blades relatively broad, coarsely toothed. 



Seeds blunt-edged : leaf-blades of a triangular type. 



5. C. u7-bicuvt. 

 Seeds sharp-edged : leaf-blades of a rhombic type. 



6. C. ttiurale. 

 **.Seed and pericarp easily separable from one another. 



Foliage and inflorescence pale and copiously mealy, even at maturity. 



7. C. leploph} llicm. 

 Foliage and inflorescence green and glabrous, at least at maturity. 



8. C. Bosctamim. 

 b. Seed vertical. 



Leaf-blades of an oblong type, sinuate-pinnatifid : seed sharp-edged. 



9. C. glauitim. 

 Leaf-blades of a triangular type, entire or nearly so : seed blunt-edged. 



10. C. Bonus- Henri cus. 

 B. Embryo horseshoe-shaped, forming an incomplete ring : plants glandular 

 and aromatic. 

 Leaf-blades pinnalely lobed. 11. C. Bolrys. 



Leaf-blades entire, undulate or coarsely toothed. 

 Spikes conspicuously leafy-bracted. 12. C. ambrosioides. 



Spikes nearly naked or minutely bracted. 13. C. anthelminlicum. 



1. Chenopodium album L. Lamb's Quarters. Pigweed. (Man. 

 p. 369 ; I. F. f. ijjg. ) In waste places, ibroughout N. Am. except the 

 extreme north. Nat. from Eu. Native also of Asia. — Pe^insyliania : 

 Northampton ; Erie ; Franklin ; Chester ; Lancaster ; Monroe : 

 Delaware ; Allegheny. 



2. Chenopodium viride L. Pigweed. (Man. p. 369. ) Range of the 

 preceding. — Pennsylvania : Northampton ; Lancaster. 



3. Chenopodium hybiidum L. Maple-lEaved GOOSEFOOT. (Man. 

 p. 370; !• F. f. 136S.) Ill woods and somelimes in waste places, Quebec 

 to B. C, N. Y., Ky., Kans., Utah and N. Mex. — Pennsylvania : North 

 AMPTON ; Huntingdon ; Lancaster ; Erie ; Chester. 



4. Chenopodium polyspermum L. Many-sEEdEd Gooseeoot. 

 (Man. p. 370; I. F. y. J362.) In waste places and on ballast, Mass. to 

 N. J. Adv. from Eu. — Pennsylvania : Philadelphia, ballast ; Bucks. 



5. Chenopodium urbicum L. Upright or City GoosefooT. (Man. 

 p. 370; I. ^.f- 1366.) lu waste places, especially in cities, N. S. aid 

 Ont. to N. Y. Adv. from Eu. — Pennsylvania : ALLEGHENY. 



6. Chenopodium murale L. Nettle-lEaved GoosefooT. (Man. 

 pi. 370; I. F. /. J36J.) In waste places, Me. to B. C, to Fla. and Mex; 

 Nat. from Eu. — Pennsylvania : Northampton ; Franklin ; Bucks ; 

 Lancaster. 



