150 GROWTH AND WORK OF PLANTS 



The lower part of this lip is prolonged into a long straight spur. 

 The upper part of the lower lip, at the point to which the incision 

 extends that indicates the lobes, is of a deep orange color and 

 arched upward so that it closes the " throat " of the corolla. This 

 is called the palate, and when at rest it closes the throat. By 

 pulling apart on the two lips the throat is exposed, and at the same 

 time it is seen that the incision which separates the two lips is 

 much deeper than those which separate the petal lobes of each lip. 



245. The stamens are four in number and are seated on the 

 corolla near the base of the broad part of the throat around the 

 ovary. The stamens are of two forms (dimorphic), the two lower 

 ones being shorter than the upper ones. They are shown in 

 fig. no attached to the base of the corolla tube, the corolla having 

 been removed from the receptacle and the lower lip cut away. 

 The anther lobes are two in number and nearly confluent at one end, 

 where the filament is inserted between them, and diverge some- 

 what from this point. Each locule opens by a longitudinal slit 

 along the inner face, the face opposite to the attachment of the 

 filament. 



246. The pistil is single and entire. The ovary is superior 

 oval in shape and two-loculed. There is a thickened placenta on 

 either side of the partition which is covered with numerous ovules 

 which fill the locules. The style is simple, short filamentous and 

 slightly enlarged at the end, the upper surface being the stigma. 



The Sweet Pea. 



247. The flowers of the sweet pea are produced singly or 

 in loose clusters of two or three on long flower stems or peduncles. 

 The calyx is regular, gamosepalous, green, and divided into five 

 even or nearly even pointed lobes which represent the sepals. 

 It is inferior. 



248. The corolla is irregular and peculiar in form, said to be 

 butterfly-shaped (papilionaceous). The upper petal is the broader 

 one, nearly rounded and with a short limb. It usually stands 

 erect, and is known as the " banner " or " standard." The two 

 lateral petals are irregularly wedge-shaped, and are forked at the 



