HABENARIA 31 



localities and at about the same time as Orchis 

 spectahtlis. 



It rises like Hahenaria orbiculata from two thick shining 

 leaves that do not, however, lie flat on the ground, but 

 rise slightly. They are round or oval, three to five and a 

 half inches long, and sharply, smoothly veined. The whole 

 plant is small, from eight to fifteen inches high, and half 

 that length is taken up by the loose many-flowered raceme 

 of yellowish-green flowers. The flowers have tiny, sharp, 

 spreading green sepals, very narrow petals, and a narrow, 

 sharp-pointed lip less than half an inch long. The spur is 

 also slender and sharp and as long or longer than the 

 ovary. 



Hahenaria Hookeriana is a midland plant, growing from 

 June to September, from Nova Scotia to Minnesota, and as 

 far south as New Jersey, Pennsylvania and Iowa. 



There is an English orchid, Hahenaria chlorantha, that 

 closely resembles this orchid in its structure, and what 

 Darwin has observed concerning the plant familiar to him, 

 we have found true of Hooker's Orchid. 



"Hahenaria chlorantha depends • for its fertilisation," 

 says Darwin, "on the larger nocturnal Lepidopteras. The 

 anther cells are separated by a wide space of connective 

 membrane, and the pollen masses are enclosed in a back- 

 ward sloping direction. The inside discs front each other 

 and stand in advance of the stigmatic surface. Each disc 

 is circular and in the early bud consists of a mass of cells, of 

 which the exterior layers resolve themselves into matter 



