LABIAIVIC. (mint FAMILY.) 347 



• Calyx srarceli/ at all 2-lipped, the teeth and bracts awl-shaped and awn-pointed, 



ri</id, nalid, as /oiifj as the corolla : Jloivtrs in rather dense mostly terminal heads: 

 Iciiris ri</i(l, sli</litlij pctiolvd. 



1. P. aristitum, Michx. IMimitdy hoary-puln'iiilciit (l°-20 lii;,rli) ; 

 leaves ovate-oldonf; ami oMoii^-laiK-eolate, acute, spariiijily ileiiticulatc-serratc 

 (I '-2' Ion;;), ruimdisli at tiie liasc. — riae barrens, from New Jersey southward. 



Var. hyssopifblium, Gray. Leaves narrowly ol)lon;4 or broadly linear, 

 nearly entire aiidobtusc. (P. hyssopifolium, Benth.) — Virginia and southward. 



# ♦ Calyx 2-lipped from the greater union more or less of the 3 upper teeth, which, 



with the l)racts, are subulate and bearded with some spreadinij hairs: /lowers m 

 dense and compound Jlatteiicd cymes, which become considei'ably expanded in fruit.' 

 learrs membranaceous, petioled. (S/>ecies 2-5 incline to run toyelher. ) 



2. P. Tlillia, Benth. Leaves greener and loosely sojldowny, only the floral 

 ones whitened, otherwise icsembling those of the next; cymes dense; bracts 

 much surpassing thejlowirs, their long awn-likc points and the awn-pointcd calyx- 

 teeth bearded with long loose hairs. — Dry ground, mountains of Virginia and 

 southward. 



3. P. inc^num, Miehx. Lcm-es ovate-oblong, acute, remotely toothed, 

 downy ultove and mostly hmry icith ivhiiish wool underneath, the uppermost ichitcned 

 bothgides; cymes 0}>en ; bracts linear-awl-shaped and, with the caly.x-tceth, more 

 or less awn-pointed. — Hocky woods and hills. New England to Michigan, and 

 southward. — Plant 2° -4° high, the taste intermediate between that of Penny- 

 royal and Spearmint, as in most of the following species. Very variable. 



4. P. clinopodioides, Torr. & Gr. Leaves ohlong-lanceulate, scarcely 

 toothed, sliDrt-pctioleil, not whitened ; the upper surface often smooth, the lower 

 as well as the stem downy; cymes contracted ; bracts and calyx-teeth short-subu- 

 late, the latter nearly one half shorter than the tube. — Dry copses, S. New York 

 to Pennsylvania. Connects No. 3 with No. Ci. 



* * * Calyx usually almost equally 5-toothed : flowers crowded in loose heads or dense 



clusters at the end of the branches and in the uppermost axils; the brads shorter 

 than the 2-Hpped corollas : leaves almost sessile. 



5. P, Torr6yi, Benth. Somewhat pubescent; stem strict and nearly 

 simple {•2°-3° high) ; leaves thin, linear-lanceolate, tapering to both ends (mostly 

 2' long and 2" -3" wide), nearly entire; the awl-shaped calyx-teeth and bracts 

 cancscent. — Dry soil, S. Now York to Pennsylvania. — Intermediate in aspect 

 between No. 4 and No. 8. 



tj. P. pil6sum, Nutt. More or less downy with lontj and soft whitish hairs, 

 much brauihed al)Ove ; hares lanceolate, acute at l>oth ends, or th.: lower oratr-lan- 

 ceolatf, nearly entire, the jloral not whitened; caly.x-tecth ovate-lanceolate, acute, 

 and with the bracts hoary-hairy. — Dry hills and plaitis, \V. Pennsylvania to 

 Illinois, and southwanl. 



"• P. mtlticum, Pers. Minnttly lifHiry throughout, or becoming almost 

 smooth, corymbosdy much branched { 1° - 2J° high) ; leaves ovate or broadly ovate- 

 lanceolate, varying to lanceolate, rather rigid, acute, rounded or slightly htartsltu/ted 

 at the base, mostly sessile and minutely sliarji-toothed, prominently veined, green 

 when old ; the floral ones, bracts, and triangulai- or ovate calyx-tccth, hoary with a 



