Coi,OKAi)o Weed Seeds 
69 
3. PuRSH’s Plantain {P la ntago 
purshii R. & 8.) (Fig. 131).— Seeds dull, 
mostly russet in color, long oval in out- 
line, rounded on one side and deeply con- 
cave on the other, the rounded side with 
a single transverse groove in the middle 
of the seed, the concave side with a 
lighter colored oval area, appearing as 
an oval within an oval, lighter in the 
middle and marked with two minute dark 
Fig. 131. P u r s h ’ s 
Plantain (Plantago pur- 
shii). A. Bottom view. B. 
Top view. X ' 
depressions (rarely one) ; 
mm. long, .7-1 mm. wide. 
seeds 1.5-2. 5 
4. Rib-grass, Buckthorn or Snake Plan- 
tain {Plantago lanceolata L.) (Fig. 132). 
Seeds shiny, mostly sudan-brown in color, 
rounded side smooth, the concave side with the 
margins inrolled and often nearly meeting so 
that the concave side may appear as a slit, only ; 
the depressions at the bottom of the trough-like 
depression may be darker than the seed or of 
the same color ; seeds 1.7-2. 7 mm. long, .7-1 mm. 
wide. 
Fig. 132. Rib- 
grass (Plantago 
lanceolata). Bot- 
tom view (left), 
top view (right). 
X 15. 
31. MADDER FAMILY 
(Rubiaceae) 
Fruit variable : A capsule, berry or stone fruit( drupe) ; seeds 
variable ; seed-coats thin and more or less translucent or hard and 
brittle in texture. 
Bedstraw, Cleavers 
{Galium L.) 
Fruit dry or fleshy, either bristly-hairy or with rounded projections or 
•smooth : seeds spherical or nearly so, often rounded on one side and concave 
on the other ; endosperm hard ; embryo curved. 
Key to Soecies 
Beeds 2.5-3 mm. in diameter 1..G. aparine 
Seeds 1-1.5 mm. in diameter 2..Q. boreale 
Fig. 133. Cleavers (Galium aparine). A. Top 
view. B. Bottom view, x 12. 
1. Cleavers, Goose 
Grass {Galium aparine 
L.) (Fig. 133). — Seeds 
neutral-gray to mouse-gray 
in color, spherical in shape, 
with a small pit-like depres- 
sion or scar on the surface : 
seeds rough, covered with 
short, hooked bristles ; 
fruits 2.5-3 mm. in dia- 
meter. 
