0 
Colorado Agricultural Colli'GK 
Seeds without a white 
scar at the hilum 
Seeds marked with 
7-10 broken, white- 
tipped, transverse 
ridges 18 . . OXALIDACEAE (Oxalis) 
Seeds not marked with 
white - tipped 
ridges; seeds mark- 
ed with several 
concentric ridges 
converging at the 
base (hilum) 13. 
Seeds not dull black 
Seeds gray or drab in 
color, hairy, mot- 
tled with broken 
lines or spots 33, 
Seeds not gray or drab 
in color 
Seeds yellow to yel- 
low-red or brown 
in color 
Seeds thin and 
parchment-like, 
with a distinct 
margin 23 . 
Seeds not thin and 
parchment-like 
Seeds with one 
central, lon- 
g i t u d i n a 1 
groove with- 
in a loop-like 
c o n c e n trie 
line, both 
converging at 
the hilum . . .13. 
Seeds not groov- 
ed 
Seeds hooked 
on with a 
beak; seeds 
smooth ... 11. 
Seeds not hook- 
ed or beak- 
ed; seeds 
g r a nular, 
o b s curdy 
id t t e d , 
crustaceous 
(hard) ...28. 
BRASSICACEAE 
(Thlaspi) 
COMPOSITAE 
(Helianthus) 
ASCLEPIADACE A E 
(Asclepias) 
BRASSICACEAE 
(Lepidium, not 
campestre) 
RANUNCULACEAE 
(Ranunculus) 
SOLANACEAE (Solanum) 
Seeds variable in col- 
or, mostly ivory- 
yellow to drab; 
seeds with a lon- 
gitudinal mark 
or groove 
