DIDYNAMIA— GYMNOSPERMIA. Mentha. 87 



the figure. M. lapponica, Wahlenb. Lapp. 161. t. 10, comes 

 very near to prcecox. 



12. M. agrestis. Rugged Field Mint. 



Flowers whorled. Leaves somewhat heart-shaped, strongly 

 serrated, rugose. Stem erect. Calyx bell-shaped, covered 

 all over with horizontal hairs. 



M. agrestis. Sole Menth. 33. t. 14. Comp. ed. 4. 101 . Engl. Bot, 



t'.SO. ^2120. 

 M. arvensis e. Sm. Tr. of Linn, Soc, v. 5.213, 216. FL Br. 624. 



In corn-fields and neglected gardens. 



About the Mendip hills, Shepton-xMallet, and Frome, Somersetshire, 

 abundantly. Mr. Sole. Very common in Sussex. Mr. Borrer. 



Perennial. August, September. 



Whether this be a distinct species or not, I will not dare to assert, 

 nor do I know any person competent to decide the question. It 

 has remained unchanged in my garden for 25 years, though 

 almost naturalized, and frequently removed. It is a larger more 

 hairy plant than M. arvensis, of a darker green, with an upright 

 copiously branched stem, whose hairs are deflexed. Leaves 

 ovate-heart-shaped, rugged, or somewhat plaited, coarsely ser- 

 rated. Iiiflorescence,Jiower- stalks and calyx, as well as corolla, 

 not materially different from the last, of which, if I were guided 

 solely by my own principles, founded on the calyx and^oit-er- 

 stalks, 1 should make it a variety. 



13. M. Pulegiwn. Penny-royal. 



Flowers whorled. Leaves ovate. Stem prostrate. Flower- 

 stalks and calyx all over downy; teeth fringed. 



M. Pulegium. Lin7i. Sp. PI.S07. Willd. v. 3. 82. Sm. Tr. of Linn. 



Soc.v. 5.216. FL Br. 624. Engl. Bot. v. 15. f. 1026. Hook. 



Scot. 181. Woodv. t.\7\. Sole Menth. 5\.t. 23. 

 M. n.221. Hall. Hist. v.\. 97. 

 Pulegium. Raii Syn. 235. How Phqt. 99. Bauh. Hist. v. 3. p. 2. 



256./. Fuchs. Hist. 198./. Briuif. Herb. v. 1. 227./. Matth. 



Valgr. V. 2. 65./ Camer. Epit. 471./ Riv.Monop. Irr. t.23. 



P. regium. Ger. Etn. 67\'J. Merr. Pin. 99. 



On wet commons, and about the margins of small brooks. 



Perennial. September. 



Much smaller than ai»y of the foregoing .species, with a strong, 

 acrid, very peculiar smell, resembling Thymus Nepefa. The 

 steins are somewhat procumbent, or quite prostrate, downy, 

 bluntlv quadrangular, throwing out radicles here and there. 

 Leaves scarcely iuilf an inch long, often much less, stalked, de- 

 flexed, ovate, obtuse, with a few shallow unequal scrratures, 



