CHENOPODIACEAE 119 



I,ower surface of the leaf-blades decidedly mealy : inflorescence dense, 



I. C. album. 

 towersurface of the leaf -blades glabrous or glabrate : inflorescence lax. 



Panicles leafy-bracted. z. C. viride. 



Panicles naked. 3. C. hybridum. 



tt Flowering branches shorter than the accompanying leaves: mature 



sepals not keeled. 

 I,eaf-blades relatively narrow, entire. 4. C. polyspermum. 



I,eaf-blades relatively broad, coarsely toothed. 



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



5. C. urbicum. 

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



6. C. murale. 

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



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



7. C. leploph) Hum. 

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



8. C. Bosctanum. 

 b. Seed vertical. 



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



9. C. glaucunL, 

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



10. C Bonus-Henric-u-s. 

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

 and aromatic. 

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



Leaf-blades entire, undulate or coarsely toothed. 

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



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



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

 p. 369; I. F. f. 1359.) In waste places, throughout N. Am. except the 

 extreme north. Nat. from Eu. Native also of Asia. — Pennsyliania : 

 Northampton ; Erie ; Franki<in ; Chester ; Lancaster ; Monroe ; 



DEI<AWARE ; Al,LEGHENY. 



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

 preceding. — Pennsylvania : Northampton; Lancaster. 



3. Chenopadium hybridum L- Mapi<e-i,Eaved GoosEFOOT. (Man. 

 p. 370; I. F. f. 1368.) In woods and sometimes 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 Goosefoot. 

 {Man. p. 370; I. F. _/. Jjds.) In waste places and on ballast, Mass. to 

 N. J. Adv. from Eu. — Pennsylvania : Phii,adei<phia, ballast ; Bucks. 



5. Chenopodium urbioum L. Upright or City G00.SEF00T. (Man. 

 p. 370; L F. y^ ^366.) lu waste places, especially in cities, N. S. and 

 Out. to N. Y. Adv. from Eu. — Pennsylvania : Allegheny. 



6. Chenopodium murale L. NETTLE-LEAVED GoosEFOOT. (Man. 

 p. 370; I. F. /. /J67.) In waste places, Me. to B. C, to Fla. and Mex; 

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

 Lancaster. 



