Colorado Weed Seeds 
Yellow Sweet Clover {Melilotu.s 
officinalis (L.) Lam.) (Fig, 95). — 
Seeds dull or occasionally shiny, 
grape-green in color, smooth, 1.5-2.3 
nm. long, 1-1.5 mm. wide, oblong to 
long oval in outline, notched at one 
?nd, regular in shape. 
t, 
. White Sweet Clover {Melilotus alba 
Desv.) (Fig. 96), — Seeds mostly dull, 
i)ld-gold in color, smooth; other characters 
IS in 1/. officinalis. 
17. GERANIUM FAMILY 
(Geraniaceae) 
A few species of Geranium seed are occasionally found in 
i:rimson clover and red clover. Seeds of these crops are imported 
from other states and the greater part of the crimson clover sold 
in the United States comes from Europe. 
1 Of the many species of Geranium found in Colorado none of 
;he seeds have appeared in our commercial samples of seed thus 
far. The scarcity of these seeds in crop seeds may be due largely 
:o the method of seed dispersal. The sudden contraction of the 
:oiled awn, resulting from contact with moisture, to which the 
ywn is highly sensitive, ruptures the fruit and the seeds are shot 
3ut, sometimes traveling several feet. 
Some of the Colorado species have been introduced from 
Europe, possibly in such importations as named above, others are 
:hought to be native. 
Fig. 96. White Sweet Clover 
(Melilotus alba), a. Seed. b. 
Pod. X 11. 
Fig. 95. Yellow Sweet Clover 
(Melilotus officinalis), a. & b. 
Seeds, c. Pod. x 11. 
