THE MONOCOTYLEDONES 2095 



After having eaten the nectar they try to get out again the same way but 

 the walls are strongly arched and they cannot get out that way. Instead 

 they squeeze their way through one of the lateral openings after having 

 crept under the stigma. In doing so they brush one side or other of their 



Fig. 2031. — Cypripediiim calceoliis. Lady's Slipper. A, Flower. B, Labellum pouch in 

 section, showing the stigmas in receptive position. In A a bee is shown escaping from 

 a lateral opening of the pouch and pushing past the laterally placed anthers. {After 

 Kertier and Oliver.) 



body against the soft, viscid anther which forms the side of the lateral 

 opening. When they visit a second flower this pollen is brushed off on the 

 stigma as they creep under it and cross-pollination is ensured. Once 

 again they become smeared with fresh pollen as they creep out of the 

 prison. 



Many species of Cypripediiim are cultivated and a number of extremely 

 beautiful hybrid forms have been produced by orchid-growers. 



II. Monandrae 



Stamen solitary, representing the abaxial member of the outer whorl. 

 This abaxial member is actually seen in the adaxial position owing to the 

 twisting or resupination of the ovary through 180°. The lateral stamens 

 are completely abortive or are represented only by small staminodes, which 

 are considered to belong to the inner whorl. The pollen united in masses 

 or in poUinia. The two lateral stigmatic lobes are functional, the median, 

 anterior one extending back into a small rostellum placed below and in 

 front of the anther lobes and bearing the viscidia to which the caudicles 

 are attached. 



A. Basitonae 



Caudicle arising from the base of the pollinium. Anthers erect, or 

 more or less resupinate, very closely adnate to the broad-based column. 

 Never deciduous after flowering. PoUinia always granular. 



2L 



