GOOSEFOOT FAMILY 61 



2. Plants herbaceous, annual 



a. Bracts of the fruit united only at the base 



(1) Bracts ovoid or orbicular, thin, the fruit 



appearing broadly winged A. hortensis 



(2) Bracts triangular, thick, often warted A. pdtula 



b. Bracts united beyond the middle 



(1) Fruiting bracts 3-4 mm. long 



(a) Bracts horned and warted A. argentea 



(b) Bracts smooth, toothed A. truncata 



(2) Fruiting bracts 1-2 mm. long 



(a) Bracts entire, united at the edges A. ovdta 



(b) Bracts 3-toothed, free at the edges A. Wolfii 



Chenopodium Linne 1753 Goosefoot, Lamb's Quarters 



(Gr. chen, goose, podion, little foot, from the leaf) 



(Blitum L.) 



PL 8, fig. 3. 



Sepals 2-5, somewhat united, somewhat fleshy, occasionally colored, 

 petals none, stamens 1-5, ovary 1-celled, styles 2-3, fruit 1-seeded, enclosed 

 • in the calyx ; flowers perfect, usually in spikes or heads ; leaves alternate, 

 simple, usually toothed or lobed ; mostly annual. 



1. Leaves silvery-mealy, at least below 



a. Leaves coarsely toothed or lobed, lance-ovate 



to ovoid 



(1) Plants low and spreading, much branched 

 ■ at the base, 2-15 in. high 



(a) Leaves oblong or lance-oblong, each 



edge sharply 3-5-toothed C. glducum 



(b) Leaves triangular-ovate, mostly 3-lobed C. incdnum 



(2) Plants tall, erect. 2-8 ft. high; leaves 



ovoid, toothed or lobed C. album 



b. Leaves entire, or nearly so, linear to lance- 



oblong C. IcptophS'Uum 



2. Leaves green, not silvery-mealy 



a. Leaves pinnatifid. sticky-hairy 



(1) Flowers single, 5 mm. wide, on forking 



branches C. cornutum 



(2) Flowers densely clustered, 1-1.5 mm. wide, 



on spike-like stems C. botrxs 



b. Leaves smooth 



