12 CLASS II. ORDER I. 



15. COLLINSONIA. 

 CoLLiNSONiA Canadensis. L. Horse weed. 



Leaves heart-ovate ; stem smooth : teeth of the 

 calyx subulate, shorter than the tube. 



Plant three or four feet high. Stem smoisth, furrowed on four 

 sides, slightly pubescent. Leaves opposite, very large, serrate 

 and acuminate, the lower ones on long petioles, the upper pair 

 sessile. Panicle terminal, its branches opposite. Flowers dull 

 yellow; lower lip of the corolla fringed. Stamens distant, slen- 

 der, very long. Style very long, dark purple ; stigma bifid. — 

 Roxbury, road side. — July, August. — Perennial. 



16. CRYPTA. 



Crypta minima. Nutt. Small Cri/pta. 



Syn. Peplis Americana. ) „ , 

 Herpestis micrantha. j 



A minute plant, creeping and rooting in the mud and sand. — 

 Leaves wedge-obovate, opposite, entire, obtuse. Flowers axil- 

 lary roundish, very minute, white. Calyx leaves oval, concave. 

 Petals two or three concave. Stamens two or three. Cap- 

 sule globular. — Banks of Fresh Pond. — Mr. Tuckerman. — 

 August. 



17. CIRC^A. 



Circ^ea lutetiana. L. Enchanter' s nightshade. 



Stem erect ; leaves ovate, slightly toothed, opaque, 

 pubescent. 

 Syn. CiRC^A Canadensis. Muhl. 



Stem round ; Leaves opposite. Flowers in terminal racemes ; 

 petals inversely heart shaped, reddish white ; capsules roundish, 

 covered with minute hooks; stalks of the capsules bent back- 

 ward. — Moist woods, particularly on Chelsea beach island. — 

 June, July. — Perennial. 

 CiRC^A ALPiNA. L. Alpine enchanter' s nightshade. 



Stem branched ; leaves broad-heart shaped, mem- 

 branous, toothed. 



