DIDYNAMIA GYMNOSPERMIA, 387 



capsule 2-celled, oblique, opening on one side ; cell 2-seeded ; seeds 

 cartilaginous, cylindric-oblong, smooth. 



286. OROBANCHE. Calyx 4 5-clefl; segments often unequal; 

 corolla ringent ; capsule ovate, acute, 1-celled ; seeds numerous ; a 

 gland beneath the base of the germen. 



287. EPIPHEGUS. Polygamous; calyx abbreviated, 5-toothed; cor. 

 of the infertile flower ringent, compressed, 4-cleft ; lower lip flat ; 

 corolla, of the fertile flower minute, 4-toothed, deciduous : capsule 

 truncate, oblique, 1-celled, imperfectly 2-valved, opening only on 

 one side. 



DIDYNAMIA. 



GYMNOSPERMIA. 

 . 259. TEUCRIUM. Germander. 



T. canadense: hoary-pubescent; leaves ovate-lanceolate, serrate, all 



petiolate; stem erect; spike verticillate, crowded, long. 

 HAB. Low grounds. July Aug. 1}.; stem 12 18 inches high; 



bracts longer than the calyx ; flower purple. 

 T. virginicum: pubescent; leaves ovate-oblong, serrate; the upper 



ones subsessile ; stem erect ; spikes verticillate, crowded ; bracts 



longer than the calyx. 

 HAB. Low grounds. June Aug. 7J-. 



260. MENTHA. Mint. 



M. viridis: spikes interrupted; leaves sessile, lanceolate, acute, na- 



ked ; bracts setaceous, and with the teeth of the calyx somewhat 



hairy. 

 HAB. Low grounds. Aug. 1J.; a foot high; leaves smooth ; spikes 



long ; flowers purple. 

 M. canadense: flowers verticillate; leaves lanceolate, serrate, petio- 



late, hairy ; stamens as long as the corolla. 

 HAB. Sandy soils. Aug. Sept. If.; a foot high; flower pale 



purple. 

 M. borealis: ascending, pubescent; leaves petiolate, oval-lanceolate, 



acute at each end ; flowers verticillate ; stamens exsert. 

 HAB. Low grounds. July Sept. 1|.; stem 2 feet high, hairy 



backwards. 



261. HYSSOPUS. Hyssop. 



H. nepetoides : spikes verticillate, cylindric ; leaves subcordate, ovate, 

 acuminate, dentate. 

 34 



