DIDYNAMIA, GYMNOSPEHMIA. 
S3 
grabroiis ; 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. pi. 977. (^Labiates.) 
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.” 
a. Brown. — Jfutt. 
1. L. leaves cuneiform-ovate, three lobed, den- caviiiaca. 
tate; corollas larger than the prickly calix; 
middle segments of the lower lip acute. — Willd. 
Icon. FI. 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. pi. 970. {Labiates.) 
Calix 5-cleft, subequal. Anthers approach- 
ing each other in pairs, each pair produc- 
ing the form of a cross. — JTutt. 
1. G. leaves reniform-crenate. — Willd. haieracea. 
Icon. FI. Dan. 789. Curt. Lond. 2. t. 44. 
Ground Ivy. Gill. Mehoof. 
A creeping plant, with blue flowers. Mr. Nuttall is inclined 
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