34 Principles of Plant Culture. 
cotyledons or seed-leaves. In the bean and pumpkin, the 
cotyledons form a pair of very clumsy leaves, which in the 
bean, at first point downward, but afterward become up- 
right, by the straightening of the hypocotyl beneath them. 
Fic. 7. Plantlet Fie. 8. Plantlet Fie. 9. Plantlet Fie.10 Plantlet 
of pumpkin. of bean. of Indian corn. of pea. 
In the pumpkin aud bean, the seed-leaves (cotyledons) are lifted above the 
surtace of the soil in germination. 
Ia the corn and pea, tne cotyledons are not lifted above the surface of the soil 
in germination. 
We observe that the pea has also a pair of cotyledons (c), 
that have not separated to the same extent as those of the 
bean and pumpkin, and are still beneath the soil. The 
corn, in common with other plants of its class, as sorghum, 
sugar cane, the reeds, grasses, etc., has but one cotyledon, 
and that is not easily made out without dissecting the seed. 
In Fig. 12, which shows a cross section of the germinating 
corn grain, the cotyledon appears at cot. 
The plants having two cotyledons form a very important 
class in botany, known as Dicotyledones (di-co-tyl-e’-dones) ; 
