272 LABI AT A E 



27. CUNILA L. 



1. Cunila origanoides (L. ) Britton. American Dittany. (Man. 

 p. S03 ; I. F. f.^i6y.) In dry woods and thickets, N. Y. to Fla., Ohio 

 and Ga. — Pennsylvania: Bradford; Monroe; Northampton; Lu- 

 zerne ; Bucks ; Delaware ; Chester ; Lancaster ; Frankon ; 

 Allegheny. 



28. LYCOPUS L. 



Calyx-lobes ovate, shorter than the nutlets. 



Stem not tuberous at the base : leaf-blades mainly ovate, i. L. Virguiicus. 



Stem tuberous at the base : leaf-blades mainly oblong. 2. L. C07ninnnis. 

 Calyx-lobes subulate or lanceolate. 



Corolla twice as long as the calyx : bracts minute. 3. L. sessilifolius. 



■ Corolla not twice as long as the calyx : bracts subulate. 4. L. Americaniis. 



'\ 1. Lycopus Virglnicus L. Purple Bugle-weed. (Man. p. 803.) 

 . In moist soil, N. Y. to Ala., Neb. and Kans. — Pennsylvania : Lacka- 

 I WANNA ; Monroe ; Luzerne ; Northampton ; Bucks ; Montgom- 

 I ery ; Delaware ; Chester ; Lancaster ; Lebanon ; Huntingdon ; 

 EkiE; Allegheny. 



2. Lycopus commxinis BickneU. Common Bugle-weed. (Man. p. 

 803.) In moist soil, Newf. to B. C, Va., Neb. and Ox^.- Pennsylvania : 

 Northampton ; Lancaster. 



3. Lycopus sessilifolius A. Gray. SESSILE-LEAVED WATER Hoar- 

 hound. (Man. p. 804 ; I. F./. 3169.) In wet soil, eastern Mass. to Fla. 

 —Pennsylvania : Lancaster. 



3. Lycopus Americanus Muhl. Cut-leaved Water Hoarhound. 

 (Man. p. 804 ; I. F. / j/7/. ) In wet soil, Newf. to B. C, Fla., Tex., 

 Utah and Calif. — Pennsylvania : Luzerne ; Columbia ; Norhtampton ; 

 Bucks ; Delaware ; Chester ; Lancaster ; Franklin ; Hunting- 

 don ; Allegheny. 



29. MENTHA L. 



Flower-clusters, at least most of them, in terminal spike-like panicles. 

 Plants glabrous or essentially so. 

 Panicles slim, mostly less than 10 mm. thick : leaf-blades sessile or nearly 



so. I. M. spicaia. 



Panicles stout, mostlj' over 10 mm. thick : leaf-blades petioled. 



2. M. piperita. 

 Plants pubescent, at least about the nodes of the stem. 



Panicles relatively thin, mostly less than 11 mm. thick. 

 Leaf -blades of a lanceolate or oblong-lanceolate type, mostly acute. 



3. JSI. longifolia. 

 Leaf-blades of an elliptic or ovate-oblong type, mostly obtuse. 



4. I\I. 7-olundi/olia. 

 Panicles relatively stout, mostly over 11 mm. thick. 



Leaf-blades sessile : panicles, at least the terminal one elongated. 



5. 3f. alopecuroides. 

 Leaf-blades, or those below the inflorescence, petioled : panicles short. 



Leaf-blades merely serrate. 6. M. aquatica. 



Leaf-blades incised and crisped. 7. M. oispa. 



Flower-clusters axillary, not in terminal spike-like racemes. 



