274 LABIATiE. 



upper lip entire ; lower 3-lobed ; tube dilated. Stamens 2. 

 Style bifid at the summit. 



B. hirsuta Benth. : plant hairy ; leaves on long petioles, ovate, rounded 

 and somewhat cordate at base, hairy on both sides ; lower teeth of the 

 calyx short, without awns. Moiiarda hirsuta Pursh. 



Low woods. Mass. and N. Y. to Car. W. to Miss. June, July. %. — Stem 

 2 — 3 feet high, branched. Ijcaves usually with a tuft of down near the midrib 

 beneath. Whorls 2^—4, on the upper part of each branch. Corolla small, pale 

 blue, dotted with purple. Hairy BlephUm. 



III. Satureine-e. Corolla somewhat 2'lipped; the lips Jlat. Sta- 

 mens 4, (sometimes 2,) straight, diverging ; the lower pair longer. 

 Anthers not dimidiate. 



7. PYCNANTHEMUM. MicA.— Mountain Mint. 



(From the Greek nvKvos, dense, and avOcftov, a flower ; in allusion to the in- 

 florescence.) 



Heads of flowers surrounded by an involucre of many bracts. 



Calyx ovoid or tubular, about 13-nerved, 5-toothed, more or 



less 2-lipped. Corolla somewhat 2-lipped ; upper lip nearly 



entire ; lower trifid, the lobes ovate and obtuse. Stamens 4, 



nearly equal, distant. Anthers with the cells parallel. 



1. P. incanum Mich. : leaves oblong-ovate, petiolate, acute, remotely 

 serrate, tomentose-pubescent beneath ; the upper ones hoary on both sides ; 

 heads compound, pedunculate, cymose ; bracts hnear-subul^e. Clinopo- 

 dinm incanum Linn. 



Low fields. Can. to Car. and Alabama. July— Sept. %.—Stem 2—3 feet 

 high, branching above, 4-angled, pubescent. Flowers pale-red, in dense lateral 

 and terminal cymes. Nearly the whole plant is covered with a vihite soft 

 down. Hoary Pycnanthemum. 



2. P. clinopodioides Torr. (f* Gr.: leaves oblong-lanceolate, on short 

 petioles, acute at each end, slightly serrate, smooth above, villous-pubes- 

 cent beneath ; heads cymose, contracted ; teeth of the calyx short, subulate. 



Dry rocky hills Kingsbridge on the Island of New York. Torr. Aug., 

 Sept. %. — ^tem H— 2 feet high, sparingly branched. I-eare^ pale-green, but 

 never hoary, (the floral ones slightly.) Heads more than half an inch in diam- 

 eter. Distinguished from the preceding principally by the want of hoariness in 

 the foliage, and the small size of the heads. {Torr.) 



Basil-leaved Pycnanthemum. 



3. P. aristatum Mich. : leaves lanceolate-ovate, subserrate, on very short 

 petioles, nearly smooth on both sides ; heads dense, sessile ; bracts acumi- 

 nate, subulate ; corolla pubescent within. Nepeta Virginica Linn. 



Woods. Md. to Car. W. to Tenn. July, Aug. 11.— Stem 1—2 feet 

 high. Upper leaves hoary. Flowers very small, white, in one or two sessile 

 whorls and a terminal head. Brads and calyx terminated by long awns. 



Spear-leaved Pycnanthemum. 



4. P. Torrei Benth. : stem strict, pubescent ; leaves varying from linear- 

 lanceolate to oblong-linear, smoothish, acute, remotely toothed, tapering 



