936 THE JOURNAL OF BOTANY 
The Mints are treated in a masterly manner, and in eS 
with recent researches. ‘In England, as in France and Germ 
there are five well-defined species of Mentha. Of these, s 
legium alone has it not yet been demonstrated that it forms 
hybrids wi with any of the other four species. M. aquatica, M.arvensis, 
M. rotundifolia, and M. silvestris all hybridize among themselves, ~ 
and ya blends which present difficulties to the ‘study of the 
many forms w ich are met with. The indefinite ape to 
Calamintha Ne i Clinopodium Nepeta Kuntze), S. Cala- 
mintha Scheele (Melissa Calamintha L., Calamintha officinalis 
Moench, Clin m Calamintha Kuntze), and S. grandiflora 
Clinopodium grandiflorum Kuntze, Calamintha sylvatica Bromt.). 
The reasons for the union of these genera are explained by Briquet 
in nd sae referred 
he genus of the eae Self-heal, Prunella vulgaris L. 
Sp. PL. ed. i. p. 600 (1753), Mr. Williams adopts the ancient form 
of the name, Brunella. He writes: ‘ Sticklers for the more pro- 
y Linneus four not count.” ains 
this verti it may be noted that Hill, in his British fait 
