30 HAY AND FODDER. 
Fig. 3.—Field Horsetail—Equisetum arvense. 
a Ordinary, green, summer form, with whorls of simple branches. 
b Brown, spring form, bearing cones and attached to an under- 
ground stem, with a food-tubercle. 
¢ A branch of the “bushy” type, with many secondary branches. 
d Branch segments, with pointed teeth (leaves) at the tip, and 
narrowed base. a, b and c about half, and d about twice 
ea ee ei Me 
