Class XIX. Order IV. 317 



come very abundant ami troublesome in Charlestown and Med- 

 ford. July, August. Perennial. 



NESESS4H14. 



330. IVA. 

 IVA FRUTESCENS. L, High Water Shrub. 



Leaves lanceolate, rough, with dots, deeply serrate ; 



stein shrubby. Willd. 



A fleshy shrub, about the borders of salt marshes. Annual 

 shoots erect, furrowed. Branches axillary, or a li'tle above the 

 leaves. Leaves ovate-lanceolate, serrate, three nerved, some- 

 what rough, upper ones entire. Flowers in a sort tof leafy ra- 

 cemes, small, drooping, green, without beauty. 



Class XX. GYNANDRIA. Stamens situated on 



the pistil. 

 Order 1. MONANDRM. One stamen. 



331. OLICHIS. Corolla five petalled, the upper pe- 

 tal arcned ; lip with a spur from its base : anther ter- 

 minal, parallel and affixed to the style. 



332. NEOTTIA. Corolla five petalled ; the external 

 petals joining round the base of the lip ; anther paral- 

 lel to the style and affixed to it behind. 



333. EPIPACTIS. Corolla erect, spreading; lip 

 without a spur, flat, pendulous, bifid at tip ; anther re- 

 sembling a lid, persistent. 



3-34. MALAXIS. Corolla spreading, resupinate ; lip 

 concave, spreading, ascending ; anther resembling a 

 lid. 



335. ARETHUSA. Corolla five petalled, somewhat 

 ringent ; lip without a spur ; anther resembling a lid, 

 persistent. 



