GOOSEFOOT FAMILY 75 



1. CHENOPODIUM (Tourn.) L. Goosefoot, Pigweed, Lamb's Quarter. 



Leaves more or less mealy or glabrate, never glandular or sweet-scented, sinuately lobed- 

 dentate or entire; embryo forming a complete ring. 

 Stamens 5; calyx not at all fleshy in fruit. 



Leaves entire or sinuately toothed, but not with large, acute (except in C. murale), 

 divaricate teeth; seeds 1-1.5 mm. in diameter. 

 Caly.x-lobes carinate; at least the upper panicles exceeding the leaves. 

 Pericarp easily separating from the seeds. 



Leaves linear or oblong, entire or sUghtly sinuately toothed. 



Whole plant almost perfectly glabrous; glomerules 1— 4-flowered, 



in very lax spikes; leaves narrowly linear. 1. C. subglabrum. 



Leaves more or less mealy beneath; glomerules several-flowered; 

 spikes denser. 

 Leaves tliin; inflorescence not very dense; spikes somewhat 

 interrupted below. 

 Leaves all narrowly hnear, 1-nerved, entire. 2. C. leptophyllum. 

 Lower leaves at least oblong or lanceolate, 3-nerved and 

 often somewhat hastately toothed. 3. C. pratericola. 

 Leaves tliick; inflorescence dense and crowded; leaves oblong. 

 Plant densely mealy, yellowish. 4. C. desiccatum. 



Plant only slightly mealy, dark green. 5. C. aridum. 



Leaves broadly ovate or triangular, more or less hastate at the base. 

 Plant densely farinose. 



Plant low and spreading. 6. C. incanum. 



Plant tall and erect. 7. C. albescens. 



Plant sparingly farinose or glabrate, tall. 



Leaves very thin, distinctly hastate; inflorescence lax. 



8. C. Fremonlii. 

 Leaves thick, only slightly hastate, rounded at the apex. 



9. C. atrovirens. 

 Pericarp firmly attached to the seeds. 



Leaves subentire or merely hastately toothed. 



Leaves linear; calyx closed in fruit. 10. C. inamoenus. 



Leaves broader, oblong, lanceolate, ovate or elliptic. 



Calyx open in fruit; plant ill-scented. 11. C. Mans 



Calyx closed in fruit. 



Leaves thick, more or less farinose, none of them cuspidate. 



12. C. Watsoni. 

 Leaves thin, glabrate; inflorescence lax. 



Seeds 1 mm. in diameter; upper leaves cuspidate. 



13. C. Berlandieri. 

 Seeds about 1.5 mm. in diameter; upper leaves long-acu- 

 minate. 14. C. lanceolatum. 



Leaves more or less sinuately dentate; inflorescence dense. 



Leaves densely mealy. 15. C. album. 



Leaves green or nearly so. 16. C. paganum. 



Calyx-lobes not carinate; panicles mostly axillary, shorter than the leaves. 

 Leaves glabrate; seeds horizontal. 17. C. murale. 



Leaves farinose and glaucous beneath; seeds vertical. IS. C. salinum. 

 Leaves with large divaricate acute lobes; seeds about 2 mm. in diameter. 



19. C. hybridum. 

 Stamens 1-2; calyx reddish and sUghtly fleshy in frmt. 



Plant usually more than 1 dm. high, erect; leaves usually more or less toothed. 



20. C. rubrum. 

 Plant less than 2 dm. high, prostrate; leaves entire or merely hastately toothed. 



21. C. humile. 

 Leaves glandular, sweet-scented, pinnately lobed; embryo horseshoe-shaped. 



Lobes ofthe leaves rounded or broadly oblong, more or less toothed. 22. C. Boirys. 

 Lobes of the leaves lanceolate, entire. 23. C. incisum. 



2. BLITUM L. Strawberry Elite, Strawberry Pigweed. 



Leaves more or less dentate, truncate or broadly cuneate at the base; inflorescence dense; 

 glomerules 5-10 mm. in diameter. 



Inflorescence naked above; seeds with acute margins. 1. B. capitatum. 



Inflorescence leafy throughout; seeds round-margined. 2. B. virgatum. 



Leaves entire, except the hastate teeth at the cuneate base; inflorescence slender and 



naked above; glomerules 3-6 mm. in diameter. 3. B. hastatum. 



3. MONOLEPIS Schrad. Poverty Weed. 



Leaves lanceolate, hastately lobed; flower-clusters several-flowered; pericarp somewhat 

 fleshy. 1. M. Nuttalliana. 



I /eaves spatulate to linear-spatulate, entire; pericarp thin. 



Flower-clusters 10-20-flowered ; pericarp easily separating from the seed. 



2. M. spathulata. 

 Flower-clusters 1-3-flowered; pericarp adherent to the seed. 3. M. pusilla. 



4. CYCLOLOMA Moq. Winged Pigweed, Tumbleweed. 



1. C. atripHci folium. 



