80 . CHENOPODIACEAE 



Plants not glandular nor aromatic. 



Pericarp easily separated from the seed. 



Calyx lobes barely keeled. 2. C. Boscianum. 



Calyx lobes strongly keeled. 



Leaves linear to oblong. 3. C. Ifptophyllum. 



Leaves triangular-hastate. 4. C. Fremontii incanum. 



Pericarp separated from seed with difficulty. 



Leaves coarsely 2-8-toothed. 8. C. hybridum. 



Leaves sinuate to incised, j 



Sepals strongly keeled. 1. C. album. 



Sepals not keeled in fruit. 



Leaves white-glaucous beneath. 7. C. glaucum. 



Leaves green on boJi sides. 



Seeds with rounded margins. 5. C. urbicum. 



Seeds with acute margins. 6. C. murale. 



Plants glandular or aromatic. 



Leaves sinuate-pinnatifid. 9. C. Botrys. 



Leaves repand-dentate to incised. 



Flowers in leafy spikes. 10. C. ambrosioides. 



Flowers in leafless spikes. 11. C. anthelminticum. 



1. C. album L. PIGWEED. Erect annual, 6' -10 high, mealy : 

 leaves rhombic-ovate to linear-lanceolate, at least the lower usually angu- 

 late-toothed, acuminate to obtuse : spikes in terminal clusters. Abun- 

 dant in waste places. May-November. A form with linear entire leaves 

 occurring in the southern part and apparently native may be distinct. 



Yar. viride (L. ) Moq. Plant not mealy: leaves obtuse or acute. 

 Infrequent in waste places. 



Var. Berlandieri (Moq.) Mackenzie & Bush, n. comb. Plant not 

 mealy : leaves cuspidate or bristle-tipped. Abundant in waste places. 

 (C. Berlandieri Moq.) 



2. C. Boscianum Moq. WOOD PIGWEED. l-4 high, not mealy : 

 leaves oblong-lanceolate, slender-petioled, nearly entire : flowers in 

 slender, terminal spikes on widely diverging branches. Common in 

 woods and thickets. July-October. 



3. C. leptophyllum (Moq.) Nutt. NARROW-LEAVED PIGWEED. 

 Annual, 6'-30' high, more or less mealy : leaves linear to oblong-linear, 

 entire : branches erect : flowers densely clustered. Infrequent along rail- 

 roads and in sandy soil throughout. May- October. 



Var. oblongifolium S. Wats. Leaves oblong. With the type but 

 much more common. 



4. C. Fremontii incanum S. Wats. PRAIRIE PIGWEED. Annual, 

 about 6 7 high, erect, mealy : leaves broadly triangular-hastate, sinuate- 

 dentate, densely mealy on both sides : spikes slender, axillary and ter- 

 minal. Has been found as a waif at Courtney; also at Armstrong, 

 Kansas. July-September. 



5. C. urbicum L. CITY PIGWEKD. Dull green annual, l-3 high, 

 not mealy, erect : leaves triangular-ovate, irregularly dentate : spikes 

 terminal and axillary, the upper longer than the leaves. Waste places in 

 Kansas City and Sheffield. Not common. June-September. 



