Colorado Weed Seeds 
7 
Seeds regular in 
shape, margin- 
less, roughen- 
ed with blunt 
project! ons 
which are more 
distinct on the 
e^jges 14 . .CAPPARIDACEAE 
(Cleome) 
Seeds irregular in 
shape, broadly 
margined, 
smooth, the 
sides faceted. . 21 . .CACTACEAE (Opuntia) 
Seeds not flattened on two sides; 
Seeds flattened on one side, 
rounded on the other ; seeds granu- , a t- 
lar, buff to olive in color 2 1 . . CUSCUTACEAE 
(Cuscuta) 
Seeds not ovate in shape 
H. Seeds fiattenea 
•j-Seeds flattened on more than 
two sides 
Seeds flattened on three sides; 
seeds triangular in cross- 
section ^ 
Seeds flattened on more than 
three sides; seeds not tri- 
angular in cross-section 
Seeds truncate 
Seeds prismatic 22. 
Seeds not prismatic; seeds 
thimble-shaped, mark- 
ed with transverse 
and longitudinal 
grooves 29. 
Seeds not truncate; smooth, 
irregular, with several 
flat sides 15 . 
fSeeds not flattened on more than 
two sides 
ffSeeds flattened on tw^o sides 
Seeds oblong in shape 
Seeds not grooved 
Seeds rounded on one 
side, either truncate 
or rounded at the 
apex 27- 
Seeds not rounded on 
one side 
Seeds 1.2-1. 5 mm. long 
with a distinct 
white margin; 
seeds smooth 33. 
Seeds 2-2.5 mm. long; 
not margined; 
seeds 6-8 ribbed, 
rough 34 
.POLYGONACEAE 
Polygonum, Rumex > 
ONAGRACEAE 
(Oenothera) 
, SCROPHULARIACE AE 
(Verbascum) 
, ROSACE AE (Rosa) 
. LARIAT AE (Lycopus, 
Leonurus, Salvia, 
Nepeta) 
.COMPOSITAE (Achillea) 
.CICHORIACEAE 
( Sonchus) 
