Mentha. LABIATE. 591 



lateral lobes of the corolla commonly united rather to the upper than to the lower : calyx 

 with short entire lips. 



13. Scutellaria. Calyx with a strong projection on the upper side, becoming casque-shaped, 



finally splitting and the upper part usually falling. 



14. Salazaria. Calyx with no projection on the back, enlarged and bladdery-inflated in fruit. 



* * Anthers all alike 2-celled. Embryo straight, as in the order generally. 



15. Brunella. Calyx reticulate-veiny, strongly bilabiate ; upper lip truncate-3-toothed, lower 



2-cleft. Filaments 2-forked at apex, one fork bearing the anther. 



16. Marrubium. Calyx 5-10-nerved, 10-toothed. Stamens enclosed in the short tube of the 



corolla. 



17. Stachys. Calyx 5- 10-nerved, 5-toothed. Stamens rising out of the throat and under the 



upper lip of the corolla. 



II. Nutlets rugose-reticulated, somewhat united at base or obliquely fixed : corolla most deeply 

 cleft between the two upper lobes. 



TRIBE VI. AJUGOIDEvE. Stamens ascending parallel, and protruded from the cleft on the 

 upper side of the corolla, which thus divides completely the upper lip : the anterior longer 

 than the posterior pair. 



18. Trichostema. Calyx campanulate, 5-cleft. Corolla with 5 somewhat similar oblong lobes; 



the limb oblique in the bud and containing the spirally coiled stamens. 



1. HYPTIS, Jacq. 



Calyx somewhat equally 5-toothed. Corolla short ; the lower lohe saccate, 

 abruptly deflexed at the contracted and callous-margined base ; the other 4 lohes 

 nearly equal and flat. Stamens 4, declined, included in the sac of the lower lobe. 

 Herbs or low shrubs, of very many South American and Mexican species, a few 

 reaching the United States. 



1. H. Emoryi, Tow. Minutely scurfy-tomentose and canescent, shrubby, 4 or 

 5 feet high, with slender branches : leaves ovate or oval, obscurely crenate, an inch 

 or less in length, slender-petioled : flowers in loose short-peduncled axillary clusters : 

 pedicels about the length of the somewhat turbinate calyx, both densely scurfy. 

 Bot. Ives Colorado Exp. 20. H. lanata, Torr. Bot. Mex. Bound. 129, a slip for 

 H. laniflora, excl. syn. 



Gravelly ravines of the Mohave (Fremont, Cooper) and eastward, Emory, Newberry, &c. Canon 

 Tantillas, within the borders of Lower California, Paltrier. "Fragrant." Corolla 2 or 3 lines 

 long, apparently purplish. 



H. ALBIDA, HBK., a related Mexican species, sparingly occurs in Arizona, but no nearer than 

 Camp Grant, Paliner. 



H. LANIFLORA, Benth., and H. TEPHRODES, Gray, are known only from the southern part of 

 Lower California. 



H. POLYSTACHYA, HBK., which is probably only H. spimta, Poiteau, an annual species, of 

 Mexico, &c., is doubtfully enumerated in Bot. Beechey's voyage ; but nothing like it is known 

 from California. 



2. MENTHA, Linn. MINT. 



Calyx about equally 5-toothed. Corolla with a short included tube, and a cam- 

 panulate almost equally 4-cleft border; the upper lobe broadest, either entire or 

 sometimes emarginate. Stamens 4, nearly equal, erect, distant. Odorous perennial 

 herbs, usually multiplying by creeping shoots or rootstocks ; with very small flowers 

 in dense clusters, the two opposite ones forming an apparent whorl, either in the 

 axils or else spicate at the top of the branches : corolla whitish or purplish. 



1. M. Canadensis, Linn. About a foot high, sweet-scented, sometimes soft- 

 pubescent, sometimes almost glabrous : leaves from oblong-ovate to almost lanceolate, 

 sharply serrate, acute, short-petioled : flowers all in short axillary clusters, the sum- 

 mit of the stem being sterile : calyx hairy, its teeth short. 



