1326 A TEXTBOOK OF THEORETICAL BOTANY 



The calyx consists of five fused sepals, inside which is a globular corolla, 

 composed of five petals completely fused together except at their apices. 

 The corolla is brownish in colour but the inside is darker in tint and may serve 

 as a nectar guide. The corolla is bilobed, the two posterior petals standing 

 more or less erect, while the three lower ones form a drooping, outwardly 

 projecting lip. There are four stamens and a staminode, the latter attached 

 to the petals. The two anterior stamens are longer than the two posterior 

 ones and in the early stage the filaments are so curved that they bring the 



Fig. 1240. — ScrophiiJaria nodosa. A, Flowering shoot. B, Flower in section. 

 Early stage with stigma presented. C, Later stage with style withered and 

 anthers presented. 



anthers down almost to the floor of the corolla tube. The staminode occu- 

 pies a posterior position and is brown in colour. It may also serve as a 

 nectar guide. The gynoecium consists of two carpels, and the style is 

 curved forward so that it rests against the posterior part of the corolla tube, 

 and, in the early stage of flowering, it projects above the opening, in the 

 median position. Nectar is secreted in the base of the corolla. The flowers 

 are markedly protogynous and in the first stage a wasp visiting the flower 

 will, when it inserts its head, come into contact with the stigma and any 



