92 SEED. 



Hibiscus, Poppy, &c, are examples. It is the most common 

 form of seed-vessel. 



The Siliqua or Silique (Fig. 15V) is a variety of the capsule, 

 composed of two carpels opening from the base upward, and 

 having a framework called the replum, which forms a spurious 

 dissepiment. When the silique is shut, it is called a silicula 

 or silicle (Fig. 158, r.) Cruciferous plants afford examples in 

 the Turnip, Cabbage, Peppergrass, &c. 



157. When two or more flowers are united to form a single 

 fruit, it is called a multiple fruit. 



The Sorosis is a multiple fruit, formed by a spike of flowers, 

 which becomes succulent. The Pineapple and Mulberry are 

 examples. (Fig. 159.) The Fig is, taken as a whole, a multi- 

 Fig. 159. 



Fig. 160. 



A Syconus. 

 Pineapple. 



pie fruit, formed by numerous flowers situated within the 

 hollowed-out peduncle. It is called a Syconus. (Fig. 160.) 



The Strobilus is a fruit-bearing spike, covered with scales, 

 each of which contains a flower, and which has two naked 

 seeds at its base. The Pine, Fir, Cedar, Hop, Cypress, and 

 Juniper are examples. 



Seed. 



158. The seed is a perfected ovule. No sooner has the influ- 

 ence of the pollen been felt by the ovule, than various changes 

 commence ; the foramen closes up, the integuments harden, and 

 the heretofore pulpy substance becomes consolidated or assimi- 

 lated. The most material change that takes place, however, is 

 the appearance of a new body, called the embryo. 



Silique? What ifl the replum? What is a silicula? — 157. What is a 

 multiple fruit? What iti a >.>[-.•>;> I Syconus ? Strobilus ? — 158. What 

 is a seed ? What changes occur when the pollen acts on the pistil ? What 

 the most material ? 



