dle Britifo Species of Mentha. 217 
In ericetis et pafcuis humidis. Fl. Septembri. 
Herba odore acri, aromatico. Caules proftrati, ramofiffimi, repentes, 
pilofi, angulis obtufiufculis. Folia parva, petiolata, ovata, obtufa, 
i Eee ferrata, fubtüs praecipue fubhirfuta. — Ferticilii feles, pro 
foliorum ratione magni, numerofi, multiflor Braéee nullx. 
Pedicelli tomentofo-incani, feu pilis breviffimis, denfiffimis, un- 
dique te&i.— Calyx tubulofus, gracilis, fulcatus, refinofo-punc- 
tatus, pilis denfis, brevibus, porrectis, undique veftitus, dentibus 
ciliatis, acutis, inzqualibus, fauce villis albis conniventibus claufà. 
Corolla calyce dupló longior, purpurea; bafi alba, extus villofiffima, 
Stamina exferta. | 
Penny-royal. cannot be confounded with any other Britifh Mint, 
nor is it fübje& to any varieties worth notice. Culture makes it 
more luxuriant and eret. Sometimes the flower is white. "There 
are fome foreign fpecies carefully to be diftinguifhed from it by the 
different hairinefs of the calyx, as well as other marks. ‘They agree 
with it in the fhort foft clofe downinefs of its flower-ftalks, by which, 
without regarding its fmall leaves, and different habit, it is decidedly 
diftinguifhed from every other Britifh fpecies. This difference con- 
firms the remark I have fo often made, of the importance of thofe 
parts in characterizing the fpecies throughout the whole genus. 
| Vor. V. : TI M | XX. On 
