Mentha 



Labiatae 



823 



Miles 



50 



Map 1786 



Lycopus amencanus 

 van Longii Benner 



early authors as Lycopus europaeus L. when some of our manuals did 

 not separate this species from the European plant. All of our Indiana re- 

 ports for the European species should be referred to Lycopus americanus. 



Newf. to B. C, southw. to Fla., Tex., and Calif. 



5a. Lycopus americanus var. Longii Benner. (Bartonia 16: 46-47. 

 1935.) Map 1786. This variety is not well marked on account of a lineal 

 series of intermediates, but is amply distinct in the extremes. In Indiana 

 it is restricted mostly to our northern counties where it grows in habitats 

 similar to those of the species but usually in slightly wetter situations. 



Long Island, N. Y., Pa., Del. ; and in nw. Ohio, s. Mich., and n. Ind. 



7328. MENTHA [Tourn.] L. Mint 



Whorls of flowers in terminal spikes, or some in the axils of the upper leaves. 

 Plants glabrous or nearly so. 



Leaves sessile or nearly so; calyx generally about 1.5 mm long 1. M. spicata. 



Leaves petiolate; calyx mostly 2.5-3.5 mm long 2. M. piperita. 



Plants canescent, woolly-pubescent or pubescent. 



Leaves petiolate; petioles about 1 cm long. (See excluded species no. 546, p. 1087) 

 M . aquatica. 



Leaves sessile or nearly so. 

 Spikes canescent. 



Leaves acute, the margins sharply serrate 3. M. longifolia var. mollissima. 



Leaves rounded at the apex, the margins incised. (See excluded species no. 



548, p. 1087) M. longifolia var. undulata. 



Spikes not canescent, leaves obtuse 4. M. rotundifolia. 



Whorls of flowers axillary. 



Upper leaves much smaller than the lower ones. (See excluded species no. 547, 



p. 1087.) M. Cardiaca. 



Upper leaves not conspicuously reduced. 



Stems more or less pubescent; calyx more or less pubescent, especially the teeth; 

 corolla usually 4-5 mm long. 



Pedicels glabrous; calyx lobes usually less than 1 mm long 5. M. arvensis. 



Pedicels retrorsely pubescent; calyx lobes usually more than 1 mm long 



5a. M. arvensis var. sativa. 



Stems glabrous; calyx glabrous or nearly so; corolla about 2 mm long 



6. M. gentilis. 



