CLASS XX. ORDER I. 339 



Stem about two feet high, branching, angular. Lower leaves 

 lyrate or irregularly toothed, upper ones entire. Flowers pur- 

 ple, solitary, terminal. Calyx round-ovate, the scales black, 

 ovate, with a stiff fringe. Florets all fertile. 



This plant, not long since introduced from Europe, has be- 

 come very abundant and troublesome in Charlestown and Med- 

 ford. — July, August. — Perennial. 



NESCESSARIA. 



356. IVA. 

 IvA Frctescens. L. High Water Shrub. 



Leaves lanceolate, rough, with dots, deeply serrate; 

 stem shrubby. Willd. 



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

 shoots erect, furrowed. Branches axillary, or a little above the 

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

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

 cemes, small, drooping, green, without beauty. 



Class XX. GYNANDRIA. Stajnens situated on the 

 pistil. 



Order I. MONANDRIA. One stamen. 



357. Orchis. Corolla five petalled, the upper petal 

 arched ; lip with a spur from its base ; anther ter- 

 minal, parallel and affixed to the style. 



358. Neottia. Corolla five petalled ; the external 

 petals joining round the base of the lip ; anther parallel 

 to the style and affixed to it behind. 



359. Epipactis. Corolla erect, spreading; lip with- 

 out a spur, flat, pendulous, bifid at tip ; anther re- 

 sembling a lid, persistent. 



360. Malaxis. Corolla spreading, resupinate ; lip 



