334 



MORPHOLOGY. 



Ripened, ovule. - 



The seed. 



665. Synopsis of the seed. 



Aril, rarely present. 



Ovular coats (one or two usually present), the 



testa. 



Funicle (stalk of ovule), raphe (portion of 

 funicle when bent on to the side of ovule), 

 micropyle, hilum (scar where seed was 

 attached to ovary). 

 Remnant of the nucellus (central part of 



ovule); sometimes nucellus remains as 

 Perisperm in some albuminous seeds. 

 Endosperm, present in albuminous seeds. 



Embryo within surrounded by endosperm 'when this is present, 

 or by the remnant of nucellus, and by the ovular coats which 

 make the testa. In many seeds (example, bean) the endo- 

 sperm is transferred to the cotyledons which become fleshy 

 (exalbuminous seeds). 



666. Parts of the ovule. In fig. 401 are represented three 

 different kinds of ovules, which depend on the position of the 



-A 



Fig. 401. 



A, represents a straight (orthotropus) ovule of polygonum; B, the inverted 

 (anatropous) ovule of the lily; and C, the right-angled (campylotropus) ovule oi 

 the bean, f, funicle; c, chalaza; k, nucellus; at, outer integument; t't, inner 

 integument; tn, micropyle; em, embryo sac. 



ovule with reference to its stalk. The funicle is the stalk of the 

 ovule, the hilum is the point of attachment of the ovule with 

 the ovary, the raphe is the part of the funicle in contact with 

 the ovule in inverted ovules, the chalaza is the portion of the 

 ovule where the nucellus and the integuments merge at the base 

 of the ovule, and the micropyle is the opening at the apex oj 

 the ovule where the coats do not meet. 



