FLORA OF THE UPPER SUSQUEHANNA. 103 



VALLISNERIA L. 



V. spiralis L. Eel-cikass. Tape-hrass. Common in all the 

 larger streams throughout our range. Whole plant submerged. 

 Leaves narrow, often several feet long. Remarkable from the 

 fact that at the time of flowering the pistillate llowers are raised 

 to the surface of the water on slender scapes, and the stemless 

 staminate flowers break loose from the parent plant, and rise to 

 the surface in order to pollinate them. By the coiling of the 

 scape the fruit is drawn under water to ripen. 



ORCHIDACE/E. 



ACHROANTHES Raf. 



A. monophylla ( L.) Greene. Adder's Mouth. Rare. Swamps, 

 occasional, Bro7un. Oxford; infrequent, ' O?'///*?. The only 

 stations. ( Micros fy lis vionophyllos Lindl. ) 



A. unifolia (Michx. ) Raf. Adder's Mouth. Very rare. Open 

 woods west of Clarke's stone quarry, Oxford, Coville. ( Mic- 

 rosiylis ophioglossoides Nutt.) 



LEPTORCHIS Thouars. 



L. Loeselii (L.) MacM. Fe.n Orchis. Twayblade. Rare. Edge 

 of road, upper side of Wellsburg Narrows, Lucy. Western side 

 Warn's Pond. Oxford, Co7>ille. South Mountain bog, Mills- 

 Paugh. Swamp near Barton, Fenno. The only stations. 

 ( Liparis Lcrselii Richard. ) 



CORALLORHIZA R. Br. 



C. Corallorhiza (L. ) Karst. Coral-root. Near Oxford; rare, 

 Coi'ille. Susquehanna, occasional, Graves. (C. innalaK. Br.) 



C. multiflora Nutt. Large Coral-root. Not uncommon in 

 dry, rich woods. Plant leafless, brownish or yellowish in color ; 

 lip of the flower three-lobed; spur prominent. 



C. odontorliiza (Willd.) Nutt. Smaller Coral-root. Crawlev- 

 ROOT. Common in the eastern part of our range. Not reported 

 west of Broome county -Similar to the preceding. Plant 

 smaller ; lip of flower white, spotted with purple, two-toothed 

 at base. Considered medicinal. July. 



