8o 



NEW YORK STATE MUSEUM 



Figure X 



Showy Ladies' -tresses 

 (Ibidium cernuum (Linnaeus) House) 



a spike, 4 to 5 inches long 

 and one-half to two-thirds of 

 an inch thick; flowers spread- 

 ing or nodding, each about 

 five-twelfths of an inch long in 

 three rows; lip oblong or ovate, 

 rounded at the apex, crenulate 

 or crisped on the margin. 

 Flowering in late summer and 

 autumn. 



Another common species 

 of Ladies'-tresses is Ibidium 

 strictum (Rydberg) House, 

 perhaps only a race of Ibid- 

 ium romanzoff ianum, 

 which has the sepals and 

 petals coherent and connivent 

 into a hood. It is common in 

 bogs and swamps during July 

 and August. 



Southern Twayblade 



(Ophrys australis (Lindley; 

 House) 



(Listera australis Lindley) 



Figure XI 



The Twayblades are 

 among the smallest of our 

 native orchids and require 

 sharp eyes to detect them 

 among the recesses of the 

 forest or bogs. The Southern 

 Twayblade is about 5 to 10 

 inches tall, with two ovate, 

 rather pointed, smooth and 

 shining sessile leaves slightly 

 above the middle of the stem 



