412 BRITISH FLOWERING PLANTS chap. 



that some naturalists have supposed it may have a 

 scent which we do not perceive. 



L. cordata. — The structure is essentially the same as 

 in the previous species. 



Spiranthes 



We have three species. S. autumnalis has the 

 radical leaves ovate or oblong ; in the other two they 

 are narrow. S. CBstivalis has the flowers in one row, 

 S. cernua in three. 



S, autumnalis (Ladies' Tresses). — The flowers are 

 upright, with a scent like that of a Hyacinth. 



S. aestivalis. — Occurs in Britain only in bogs in the 

 New Forest, and in Wyre Forest, Worcester. 



S. cernua. — Only found in a peat bog near Castle- 

 town in Cork County. 



GOODYERA 



G. repens. — Agrees generally with Epipactis in the 

 arrangements for fertilisation. The seeds are numerous 

 and very minute, only weighing '00002 of a gram. 



Cypripedium 



Flowers few, large, with an inflated lip. 



C. Oalceolus (Ladies' Slipper). — The lower lip has the 

 form of a slipper, whence the name. This genus has 

 two fertile anthers, which are rudimentary in other 

 Orchids, while the one which is functional in them is 

 here represented by a singular shield-like body. The 

 opening into the slipper is small, and partly closed by the 

 stigma and this shield like body which lies between the 

 other two anthers. The result is that the opening into 

 the slipper has a horse-shoe-like form, and that bees or 

 other insects which have once entered the slipper (Figs. 

 335, 336) have some difiiculty in getting out again. 

 While endeavouring to do so they can hardly fail to 

 come in contact with the stigma, which lies under the 

 shield -like representative of the middle anther. As 

 the margins of the lip are inflected {q), the easiest exit 



