606 Rvdberg : The American Species of 



taken out of Platanthcra and Gymnadenia. I therefore described 

 in my Catalogue of the Flora of Montana the new genera Lysiella 

 and Limnorchis and in Dr. Britton's Manual Gymnadcniopsis* In 

 the latter I also reestablished Blepkariglotds Raf. In the Bulletin 



of the Torrey Botanical Club,f I 



Pip 



ipsis, Beph 



or Piperia are mentioned by Pfitzer, which shows that he was not 

 well acquainted with these plants. 



This revision is based on the material found at the New York 

 Botanical Garden together with a few specimens cited from the 

 Canby Herbarium. A few of the Habcnariac, described from 

 Mexico and Central America may belong to Limnorchis or Piperia. 

 I have not seen, however, any species from there referable to either 

 genus, but as several are unknown to me I have limited my work 

 to the North American species growing north of Mexico. One of 

 the Siberian specimens in the Columbia University herbarium is 

 evidently a Limnorchis, but as it is wrongly named and rather 

 scrappy, I have left it without consideration. 



The illustrations are drawn by the writer and represent two 

 views of each species on a scale twice the natural size. 



LIMNORCHIS Rydb. Mem. N. Y. Bot. Gard. i: 104. 19 00 



Leafy -stemmed plants with elongated fusiform root-like tubers 

 and fleshy-fibrous roots : flowers whitish or greenish or tinged with 

 purple ; upper sepal ovate to almost orbicular, erect, 3-7-nerved 

 but usually 5 -nerved ; lateral sepals from linear to ovate-lanceolate, 

 free from the lip, 3-nerved, seldom 4-5-nerved, spreading or often 

 somewhat reflexed ; upper petals erect, usually slightly shorter 

 than the upper sepal, from narrowly to broadly lanceolate, 3-nerved, 

 oblique at the base and semi-cordate, that is cordate on the lower 

 side ; lip entire, usually indistinctly nerved, flat or slightly con- 

 cave, reflexed, free, not clawed, from linear to rhombic-lanceolate, 

 obtuse ; column short and thick ; anther-cells parallel, openini 

 in front ; stigma broadly triangular ; ovary sessile, in fruit elon- 

 gated ellipsoid. 



The mode of propagation in many orchids is very peculiar. 

 Near the base of the stem is produced a short offset, tuber-, corm- 

 or root-like in appearance, usually fleshy. In the upper portion 



:: ' Wrongly printed as Gymnandeniopsis . 

 f2S : 269. 1901. 



