54 
Colorado Agricultural College 
5 . Medick, Lucerne 
{Medicago (Tourn.) L.) 
Pods 1- to several seeded, coiled or 
curved, spiny, net-veined, or smooth, seldom 
splitting open at maturity ; seeds regular or 
irregular in shape and size, generally kidney- 
shaped or broadly oval in outline, with a 
characteristic projection near the hilum. 
Black Medick, Nonesuch {Medicago 
lupulina L.) (Fig. 92). — Pods black, marked 
with a distinct network of veins ; seeds lime- 
green to clay color, somewhat flattened, 
broadly oval to kidney-shaped, with a distinct 
[projection near the hilum, regular in siiape, 
1.5-2 mm. long, 1-1.3 mm. wide. 
Fig. 92. Black Medick 
(Medicago lupulina). Seeds 
(top), pod (bottom) x 12. 
6. Clover, Trefoil 
{TrifoUum {Tourn.) L.) 
Fig. 93. Low Hop Clover (Tri- 
folium procumbens). A. Top 
view. B. Edge view, x 22. 
Pods oblong, circular in cross-section, 
splitting open by 1 suture, 1-6 seeded; 
seeds oval, broadly oval to nearly spheri- 
cal, notched ; hilum usually in the middle 
of one edge. 
Low Hop Clover {Trifolium procum- 
heus L.) (Fig. 93). — ^Seeds shiny, cinna- 
mon-buff to honey-yellow in color, notch 
and hilum near the top; seeds nearly 
cylindrical, .8-1 mm. long, .5-.7 mm. in 
diameter. 
7 . Sweet Clover, Honey Clover 
{Melilotus {Tourn.) Jlill) 
Pods short and thick, straight, oval in outline, often nearly spherical, 
marked with a network of veins, seldom splitting open at maturity ; seeds 
few, regular in shape, flattened, notched near the ends. 
Key to Specie.s 
Surface of seeds rough 
Surface of seeds smooth 
Seeds grape-green in color 
Seeds old-gold in color 
Annual Sweet Clover {Melilotus 
indica {L.) All.) (Pig. 94). — Seeds 
(lull, bnffy-brown to dee'' olive in color, 
rough as though covered by minute 
grains, often tvith part of the pod 
persisting and giving the seed a scurfy 
appearance; seeds 1.2-1. 7 mm. long, 
.8-1.5 mm. wide, broadly oval in out- 
line, slightly flattened on two sid(‘s, 
notched at one end, regular in slia])e. 
1.. M. indica 
2.. M. officinalis 
alba 
Fig, 9 4. Annual Sweet 
Clover (Melilotus indica). 
A. Seed. B. Pod. x 12. 
