412 LABIATE. (MINT FAMILY.) 



2. C. Nuttallii, Gray. Smaller ; the flowering stems more upright (5 - 9' 

 high), with narrower mostly entire leaves and fewer-flowered clusters, while sterile 

 runners from the base bear ovate thickish leaves only 2-5" long. (C. glabella, 

 var. Nuttallii, Gray.) Niagara Falls to Minn., south to Mo. and Tex. 



2. Flowers in sessile dense many-flowered clusters, and involucrate with con- 

 spicuous setaceous-subulate rigid bracts ; calyx nearly naked in the throat. 



3. C. Clinop6dium, Benth. (BASIL.) Hairy, erect (1 - 2 high) ; leaves 

 ovate, petioled, nearly entire ; flowers (pale purple) in globular clusters ; hairy 

 bracts as long as the calyx. Borders of thickets and fields, naturalized exten- 

 sively, but indigenous from the Great Lakes to the Rocky Mts. (Eu., Asia.) 



16. MELISSA, L. BALM. 



Calyx with the upper lip flattened and 3-toothed, the lower 2-cleft. Corolla 

 with a recurved-ascending tube. Stamens 4, curved and conniving under the 

 upper lip. Otherwise nearly as Calamintha. Clusters few-flowered, loose, 

 one-sided, with few and mostly ovate bracts resembling the leaves. (Name 

 from fjLc\ur(ra, a bee ; the flowers yielding abundance of honey.) 



M. OFFICINALIS, L. (COMMON BALM.) Upright, branching, perennial, 

 pubescent; leaves broadly ovate, crenate-toothed, lemon-scented; corolla 

 nearly white. Sparingly escaped from gardens. (Nat. from Eu.) 



17. H E D E O M A, Pers. MOCK PENNYROYAL. 



Calyx ovoid or tubular, gibbous on the lower side near the base, 13-nerved, 

 bearded in the throat, 2-lipped ; upper lip 3-toothed, the lower 2-cleft. Co- 

 rolla 2-lipped ; upper lip erect, flat, notched at the apex, the lower spreading, 

 3-cleft. Fertile stamens 2; the upper pair reduced to sterile filaments or 

 wanting. Low, odorous annuals, with small leaves, and leose axillary clus- 

 ters of flowers (in summer), often forming terminal leafy racemes. (Altered 

 from f]$v6(r]j.ov, an ancient name of Mint, from its sweet scent.) 



* Sterile filaments manifest ; leaves oblong-ovate, petioled, somewhat serrate. 



1. H. pulegioides, Pers. (AMERICAN PENNYROYAL.) Erect, branch- 

 ing, hairy ; whorls few-flowered ; upper calyx-teeth triangular, the lower 

 setaceous-subulate ; corolla (bluish, pubescent) scarcely exserted (2 - 3" long) ; 

 taste and odor nearly of the true Pennyroyal (Mentha Pulegium) of Europe. 

 Common from N. Eng. to the Dakotas, and southward. 



* * Sterile filaments minute or obsolete ; leaves narrow, entire, sessile or nearly so. 



2. H. hispida, Pursh. Mostly low; leaves linear, crowded, almost gla- 

 brous, somewhat hispid-ciliate ; bracts spreading or reflexed ; upper flowers 

 rather crowded ; calyx-teeth all subulate, equalling the bluish corolla. Plains, 

 Minn, and Dak. to W. 111. and La. 



3. H, Drumm6ndi, Benth. Pubescent or puberulent, a span or two 

 high; leaves oblong to linear ; bracts mostly erect; calyx hirsute or hispid, its 

 teeth at length connivent, the lower nearly twice as long as the upper. Cen- 

 tral Neb. and Kan. to Tex., and westward. 



18. SAL VI A, L. SAGE. 



Calyx 2-lipped ; upper lip 3-toothed or entire, the lower 2-cleft. Corolla 

 deeply 2-lipped, ringeut ; upper lip straight or scythe-shaped, entire or barely 



