63^ 



Rydberg : The American Species of 



linear-lanceolate, acute, a little shorter than 

 the upper sepal ; lip linear, obtuse, about 

 10 mm. long; spur filiform, about 15 mm. 



long. 



(Fig. 25.) 



This is characterized by its large flowers 



and reduced leaves. 



Type : " On dry southward slopes of the 

 Pinos Altos Mountains, New Mexico, in 



1880. 



J 1 



Fig, 25. 



• 



New Mexico: White Mountains, 1897, 

 E 0. Wooton, 344 ; Pinas Altos Mountains 

 E. L. Greene. 

 Mexico: State of Chihuahua, Sierre Madre, 1887, C. G. 



Pringle, 1374. 



PI PERI A Rydb. Bull. Torr. Club, 28: 269. 



1 90 1 



Somewhat leafy-stemmed plants, but the leaves are usually 

 near the base and withering at or before the anthesis, the stem- 

 leaves being reduced and bract-like : tubers spherical or rounded 



ellipsoid ; flowers greenish or white ; sepals and petals 



1 -nerved 



or very obscurely 3-nerved ; the upper sepal ovate or lanceo- 

 late, erect ; the lateral ones spreading, linear to lanceolate, their 

 bases united with the claw of the lip ; upper petals free, lanceolate 

 or linear-lanceolate, oblique, but not cordate ; the blade of the lip 

 linear-lanceolate to ovate, obtuse, truncate or hastate at the base, 

 concave but with a longitudinal low ridge in the middle produced 

 by the undulation of the lip ; the claw, if it can be called so, united 

 with the bases of the lower sepals, bordered with an erect margin 

 which connects the lip with the column ; anther cells unusual 1> 

 large for the size of the flower, parallel, opening nearly laterally . 

 stigma a small beak in the angle between the anther-cells ; ovary 

 sessile, ellipsoid in fruit. 



The principal differences between Limnorchis and 

 the following : 



Pip 



Limnorchis 



Piperia 



Tubers elongated fusiform, Tubers rounded. 



root-like. 



Stem leafy ; leaves remaining 

 until fruit is set. 



Stem leafy at the base ; leaves 

 withering at or before anthesis. 



