LABfAT^. 275 



PVCNANTHEMUM. 



Tribe 4. SATUREINEiE. 



Calyx 5-toothed and equal, or bilabiate ivith the upper lip trijid and the lower bifid. Corolla 



sxibbilabiate^ upper lip erect, flat, evtire or bifid, lower spreading, trifid, lobes subequai ; tube about 



as long as the calyx. Utamens 2 — 4, distant, straight, diverging. 



10. PYCNA'iNTHEMUM. 



Heads surrounded by an involucre of many bracts; calyx 

 tubular, striate; upper li[) of tl»e corolla mostly eniire ; sta- 

 mens distant, 2 as long as the upper lip, 2 shorter. 



Gr. irvKvoi. dense, and av^oi, a flower ; the flowers of this genus are in 

 close heads. Lower lip of cor. trifid, the middle lobe longest. Anth. with 

 parallel cells. 



•Stamens e.xserted. 



1. P. INCA'NUM. Mz. Clinopodiumincanum. Willd. 



Leaves oblong-ovate, acute, subserrate, with short petioles and hoary 

 tomentum ; heads of flowers compound, terminal and lateral, pedunculate ; 

 brads subulate. Grows in rocky woods and hills. Stem Sfeet high, obtusely 

 4-angled. erect, and, like the rest of the plant, covered with soft, whitish 

 down. Leaves whitish beneath. Flowers pale red with purple spots, on 

 white, tomentose peduncles, in dense heads, and with numerous bracts, of 

 which the inner ones are setaceous, bearded at the end ; the outer ones are 

 lanceolate. Plant aromatic. July, Aug. Per. Wild Basil. 



2. P. ARISTA'TUM. Mz. 



Leaves lance-ovate, subserrate, with very short stalks, whitish ; verticils 

 and terininid /tend sessile ; bracts aw ned. Native of dry woods. Stem ] — 3 

 feet high, downy, erect. Leaves an incli long, punctate, nearly sessile, the 

 upper ones a little canescent with down. Flowers white, small, in numerous, 

 compound, dense, hoary, terminal, sessile whorls and heads. Aromatic — 

 tastes like pennyroyal. July, Aug. Per IVild Basil. 



3. P. LINIFo'liUM. p. Brachystemum Virginicum. Mx. 

 Stem straight, smooth ; 6;-ffnc/iC5 trichotomous, fastigiate ; leaves linear, very 



entire, ri-nerved, smooth ; lieads terminal, dense, in a fasciculate corymb. An 

 erect plant with fastigiate branches, a foot and a half high, growing in ex- 

 siccated swamps, &c. Like both the above species it tastes and smells 

 strongly like pennyroyal. Stem often purplish, slightly 4-angled, corymbose 

 at the summit. iLeaves very narrow, entire, sniootli and punctate, with 

 fascicles of smaller ones in the axils. Flowers small, white, in numerous, 

 small, roundish heads, mostly terminal, and with imbricated bracts. Aug. 

 f- sr. Virginian Thyme. 



* * Stamens included. 



4. P. VERTICILLA'TUM. Mx. p. lanceolatum. P. 

 Stem straight, corymbosely branched, pubescent on the angles ; leaves sub- 

 sessile, ovate-lanceolate and linear-lanceolate, feather-veined, entire; verticils 

 sessile, fasciculale-corymbed ; bracts linear-lanceolate, acuminate; stamens 

 exserted. This species much resembles the preceding, but is distinct in 

 several important characters. Grows in dry woods and hills. Stem 2 or more 

 feet high, square, with obtuse angles, somewhat scabrous. Branches corymb- 

 ed, dowiiy above. Leaves varyino; in width from one si.\th to one half of 

 their length. Flowers collected in dense, canescent heads. Corolla purplish 

 white with darker spots. Aug. Per. H'horled Pycnant/iemum. 



