130 DIDYNAMIA GYMNOSPERMIA. 



(1) flowers in whorls so close together as to resemble a 

 spike. 



(2) flowers in axillary clusters from many of the upper- 

 most leaves. 



Hab. Watery places, very common. Aug. Sept. 7/ 



Mr MACDONALD of Scalpa, in the Hebrides, having some 

 years ago suffered considerably by mice, put at the bot- 

 tom, near the centre, and the top of each stalk, as it was 

 raised, 3 or 4 stalks of wild mint, with the leaves on, ga- 

 thered near a brook in a neighbouring field, and never af- 

 ter had any of his grain consumed. He then tried the 

 same experiment with his cheese, and other articles kept 

 in store, and often injured by mice, and with equal effect, 

 by laying a few leaves, green or dry, on the Articles to be 

 preserved. 



3. M. rubra, flowers whorled ; leaves ovate ; stem upright, 

 zigzag (4f or 5 feet high) ; flower-stalks, and lower part of the 

 calyx, very smooth ; teeth hairy. Red Mint. 



Hab. Reedy banks of rivers. " About Whiteadder 

 Island," Thomp. I think I have observed it at the side 

 of the Blackadder, below Mungo's Wells, Berwick- 

 shire. Sept. If 



4. M. gentilis, flowers whorled ; leaves ovate ; stem much 

 branched, spreading; flower- stalks, and base of the bell-shaped 

 calyx, nearly smooth. Bushy Red Mint. 



(1) leaves of an uniform green colour. 



(2) leaves variegated with yellow. 



Hab. (1) Sides of Wooler Water, near the Haugh-head, 

 sparingly. (2) Side of the water course above the card- 

 ing-mill at Wooler, apparently wild. Aug. I/. 



5. M. arvensis, flowers whorled ; leaves ovate ; stem much 

 branched, diffuse ; calyx bell-shaped, covered all over with hori- 

 zontal hairs. Corn Mint. 



Hab. Moist sandy corn fields. " About New Water 

 Haugh," Thomp. Plentiful on the fields about Stoney- 

 muir Rig. June-Sept. If 



