Pycnanthemum. LABIATiE. 61 



Tribe III. SATVREINEjE. Benlh. 



Calyx b-toothed and equal ; or 2-lipped, with the upper lip 3-toothed and the lower 2-cleft, 

 Corolla somewhat 2-lipped; the upper lip erect, flat, entire, or deeply emarginate ; 

 lower spreading, 3 -cleft ; the lobes nearly equal : tube about as long as the calyx. 

 Stamens 4, or sometimes 2, distant, diverging. 



CONSPECTUS OP THE GENERA. 



* Fertile stamens 4. 



6. ProNiNTHEMUM. Calyx equal or 2-Iipped, naked inside. Upper lip of the corolla oblong, entire or emarginate. — 



Herbs, with the whorls many-flowered and bracteate. 



7. Obioandm, Calyx almost equally 5-toothed, villous in the throat, Spikelets imbricate, with broad bracts. 



** Fertile stamens 2. 



8. CoLLiNsoNiA. Calyx 2-lipped ; upper lip truncate, 3-toothed. Corolla 4-lobcd ; the three upper lobes nearly equal ; 



the lower larger, toothed or fimbriate. 



9. Cdnila. Calyx almost equally 5-toothed. Upper lip of the corolla scarcely longer than the others, emarginate or 



nearly entire. 



6. PYCNANTHEMUM. Michx. Jl. 2. p. 7 ; Benth. Lab. p. 326. MOUNTAIN MINT. 

 [ From the Greek, pyknos, dense, and antkemon, a flower ; the flowers being in close heads or clusters.] 



Calyx oblong-tubular, about 13-nerved, equally 5-toothed, or more or less 2-lipped. Corolla 

 somewhat 2-lipped ; the upper lip flat, entire or slightly emarginate : lower lip almost 

 equally 3-lobed ; the lobes ovate, obtuse. Stamens 4, nearly equal, distant : anthers with 

 parallel cells. — Perennial herbs, corymbosely paniculate. Flowers small, white or flesh- 

 colored, in dense cymulose bracteate heads which are mostly terminal. 



* Calyx flipped : flowers in raiker loose cymose heads. Leaves pelioUd. 



1. Pycnanthemum incanum, Michx. Common Mountain Mint. Welsh Mint. 



Leaves ovate-oblong, petiolate, acute, remotely serrate, pubescent, hoary-tomentose under- 

 neath, the floral ones white on both sides ; flowers in compound cymose heads ; bracts linear- 

 subulate ; teeth of the calyx lanceolate, acuminate. — Michx. fl. 2. p.7 ; Pursh,fl. 2. p. 409 ; 

 Nutt. gen. 2. p. 33 ; Ell. sk. 2. p. 79 ; Bigel. fl. Bast. p. 238 ; Beck, bot. p. 272 ; Benth. 

 Lab. p. 327 ; Darlingt. fl. Cest. p. 344 ; Gray, in Sill. jour. 42. p. 45. Clinopodium 

 incanum, Linn. ; Willd. sp. 3. p. 132. Origanum incanum, Walt. fl. Car. p. 165 ; Dill, 

 hort. Elth. t. 74./. 85 ; Pluk. mant. t. 344./. 7. 



Stem 2-4 feet high, branching, obtusely 4-angled. Leaves \\ -2 inches long, acute 

 at the base, with small distant salient teeth ; the lower ones pale green above, and whitish, 

 velvety-pubescent underneath : petioles 4-8 lines long. Flowers in pedunculate compound 

 fastigiate heads or cymes. Bracts subulate, awned. Calyx hoary, pretty distinctly 2-lipped ; 

 the teeth with one or two bristles at the summit. Corolla white or pale rose-color, spotted 

 with purple, pubescent ; the upper lip small, oblong. Stamens a little exserted. Ovary 

 bearded. 



