DIDYNAMIA, GYMNOSPERMIA. 33 
grabrous; whorls sub-6-flowered ; calices di- 
varicate, spinous.— Mich. and Pursh. 
S. tenuifolia, Willd. ? 
S. arvensis, Walt. 
Rough Wound-wort. Hedge-nettle. 
From one to two feet high. In full flower very handsome. 
Flowers purple. Along the banks of rivers and creeks, and in 
low meadows, common; particularly along the bank-walks of 
the Delaware and Schuylkill. Perennial. July. 
270, LEONURUS. Gen. pl. 977. (Labdiate.) 
Calix pentangular, 5-toothed. Upper lip of © 
the corolla villous, flat, entire; lower lip 
3-parted, with the middle segment undi- 
vided. Lobes of the anthers parallel.” 
R. Brown.— Vutt. 
1. L. leaves cuneiform-ovate, three lobed, den- Cardiaca. 
tate; corollas larger than the prickly calix; 
middle segments of the lower lip acute.— Willd. 
Icon. Fl. Dan. 727. Engl. Bot. 286. 
Mother-wort. Mug-wort. 
About two feet high. Flowers white and red, or purple. In- 
troduced, and naturalized abundantly in all wastes near habi- 
tations. Perennial. July. 
271. GLECHOMA. Gen. pl. 970. (Ladiate.) 
Calix 5-cleft, subequal. Anthers approach- 
ing each other in pairs, each pair produc- 
ing the form of a cross.— Nutt. 
1. G. leaves reniform-crenate.—Willd. _hederacea. 
Icon. Fl. Dan. 789. Curt. Lond. 2. t. 44. 
Ground Ivy. Gill. Alehoof. 
A creeping plant, with blue Sowers, Mr. Nuttall is inclined 
4 

