Rydberg, Per Axel,  1860-1931. <br/><br/>
The American species of Limnorchis and Piperia, north of Mexico, 
by Per Axel Rydberg. 
 - New York,  1901. 
 - cover-title, p. 605-643.  illus.  24 cm. 
 - Contributions from the New York botanical garden.  no. 19 .
<br/><br/> Reprinted from the Bulletin of the Torrey botanical club 28, 25 Nov., 1901. 
<br/><br/><label>LCCN: </label>ca 09000053  
<br/><br/><label>Subjects--Topical Terms: </label><br/>Limnorchis.<br/>Piperia.<br/>Orchids--North America.
<br/><br/><label>LC Class. No.: </label>QK1  / .N515 no. 19