Coi^oRADo Wee:d Seeds 
25 
4 . Foxtail Grass 
(Setaria Beauv., Chaetochloa Scribn.) 
Lemma awnless, wrinkled, roughened transversely by fine branching 
ridges, dull, oval in shape, rarely smooth and shiny; palet rugose, both 
tiansyersely and longitudinally, tip free from the inrolled lemma; rachilla 
absent; seeds 1.5-3 mm. long, 1-2 mm. wide, fiat on one side, deeply rounded 
on the other, half circular (hemispheric) in cross section. 
Key to Species 
Seeds 2.o-3 mm. long, 1.5-2 mm. wide, 1-1.5 mm. thick, deeply 
wrinkled transversely . . , 
.. , . _ „ 1 . . S. glauca 
seed.. I. 0 -. mm. long, 1 mm. wide, .5-. 8 mm. thick, wrinkles 
shallow; seeds dark brown and mottled, or spotted 2 8 viridis 
Chaeiomoa glauca 
cri n) . (Fig. 17). Seeds yellow ocher to mummy brown in color 
deeply wrinkled, rounded side strongly arched. 
Ohaetochloa viridis 
(L.) Senbn.) (Fig. 18).— Seeds bone-brown to black in color faintly 
wrinkled, mottled, faintly arched on the rounded side. 
Fig. 18. Green Fox- 
tail Setaria viridis). x 
12. Fruits (top and 
bottom) enclosed in 
g-lumes, fruit (left) top 
view, fruit (right) bot- 
tom view. 
5 . Crab-Grass 
( Sijn th erisma Walt . ) 
longitudinal lines, 
mm lol ^ “«rly so; palet also leathery; seeds 1-8 
mm. long, .5-1 mm. wide; rachilla absent. 
Key to Species 
Seeds I-I .5 mm. long, .5-.g 
l..iSr. 
wide, stout 2../S 
sanguinale 
humifusum 
