10 Class II. Order I. 



lip linear, lower lip with two lateral lobes and a linear middle 

 segment. Style longer than the stamens; stigma bifid. Chelsea 

 beach island. Waltham. July, August. Perennial. The taste 

 of the whole plant resembles that of thyme. 



A second variety has deep purple flowers and bractes of the 

 same colour ; leaves a little more villous. This appears to be 

 the M. Kalmiana of Pur&h. I am inclined with Michaux to con- 

 sider m;my of the supposed species as mere varieties. 



12. CUNILA. 



Subgenus HEDEOMA. Calyx gibbous at base -fertile stamens as 

 long as the corolla. 



CUNILA PULEGIOIDES. Pennyroyal. 



Leaves oblong, few toothed ; flowers whorled. 



%. HEDEOMA PULEGIOIOFS. Pers. 



A well known pungent and strong scented plant. Leaves op- 

 posite ; lanceolate-oval, with a few teeth on each side. Flowers 

 in numerous whorls ; calyxes with the upper lip ending in three 

 points, the lower in two bristles. 



This plant, having found its way into England, was described 

 as a new species of mint, under the name of mentha exigua, until 

 Dr. Smith detected the error. 



In dry grounds. July, August. Annual. 



13. COLL1NSONIA. 



COLLINSONIA CANADENSIS. Horse weed. 



Leaves heart-ovate ; stem smooth ; teeth of the 

 calyx subulate, shorter than the tube. 



Plant three or four feet high. Stem smooth, 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 bitid. 

 Roxbury, road side. July, August. Perennial. 



