16 



lufetianai 



canadensis* 

 Pursh. 



mines- 



DIANDRIA, MONOGYNIA. 



17. Circjea. Gen. pi. 31. (Onagrae.J 



Cal. short, -2- parted. Petals 2. Stigma emar- 

 ginate. Caps, ovate, hispid, 2-celled, not 

 opening; cells 1-seeded. Nutt. 



1. C. stem erect, leaves ovate, denticulate, opake, 

 somewhat smooth. Vahl. 

 Icon. Eng. bot. 1056 ? (Pursh). 



Enchanter's Nightshade* 



From one foot to eighteen inches high. Flowers small, 

 reddish-white. Very common in damp shady woods, and 

 particularly abundant along the Schuylkill, towards the falls. 

 Perennial. July. 



18. Lemna. Gen. pi. 1400. (Najades.) 



CaL of one entire leaf. Stamens alternately- 

 developed, seated upon the ovarium at its 

 base. Style cylindric, stigma funnel-form. 

 Capsule 2 to 4-seeded, Nutt. 



1. L. leaves elliptical, flat both sides, cohering at 

 their base ; roots rarely solitary. Willd. 

 Icon. Eng. bot. 1095. 



Duck-weed. Duck-meat. 



A little floating aquatic plant of a beautiful green colour, 

 covering the surface of stagnant waters and ditches. Leaves 

 the size of a large spangle, two or three cohering together at 

 their base. Flowers very minute proceeding from a pouch- 

 like marginal division of the lamellae of the leaves . Very com- 

 mon ; and always abundant where found. In a pool, three or 

 four squares south of the Pennsylvania Hospital ; and near Ken- 

 sington, most abundant. Ducks greedily devour it — hence 

 its name. Annual. June. 



poiyrMza: 2. L. leaves elliptical flat, cohering at their base, 

 roots bundled. Willd. 

 Icon. Vail. par. t. 2p. f. 2. (Pursh). 



