432 



WEED FLORA OF IOWA 



Lamb's Quarters (Chenopodium album L.). 



Seeds one-twentieth in. in diameter, often surrounded by thin 

 glandular utricle which varies from grayish to straw-color; se.ed 

 dark brown, shining, firmly attached to pericarp, edge rounded, 

 lower, convex with a curved groove; seed somewhat irregular in 

 shape; some seeds also surrounded by the pericarp and star-shaped 

 calyx. In seed of small grains, clover and grasses. 



Figure 269A 



A 



Figure 269C 



Fig. 289. A. Lamb's Quarters (Chenopodiui i album I. a to b, different views of 

 seed ; d, g, f, seed with utricle ; i, calyx attached. 



B. Maple-leaved Goosefoot (Chenopodiwm hybridum). a, seed in envelope; b, 

 c, general view of seed ; d, cross section ; e, natural size. 



C. Western Lamb's Quarters (Chenopodium mttrale). A, B and C, views of 

 seed ; D, the natural size. 



(After Hillman, A and B, Bull. Mich. Agr. Exp. Sta. ; C. Bull. Nev. Exp. Sta.) 



Maple-leaved Goosefoot (Chenopodium hybridum h.). 



Seeds dark grayish black, circular, 2.5-3 mm. in diameter, flat- 

 tened double-convex, with distinct margin, slightly indented by a 

 notch; scar on middle of one face; seed shining, black, when en- 

 velope is entirely removed. 



Spinach (Spinacia oleracea L.). 



Fruit broadly ovate, one-sixth in. in length, size variable ; utricle 

 unarmed, wrinkled, sometimes tuberculate. straw-colored; achene 

 closely enveloped by utricle; scar elevated. 



