MINT FAMILY 749 



Leaf-blades ovate-cordate; plant pale, more or less cinereous. 



3. A/, mcnthaefolia. 



Leaf-blades lanceolate, with rounded or truncate base; plant gruou. 



4. M, stricta. 



Petioles 1-3 cm. long. 6. M, mnUis, 



Heads or verticillate glomerules several in the upper axiLs of the loaves; stamens scarcely 



exceeding the emarginate or cleft upper lip of the corolla. 6. A/, pectinata. 



1. M. comata Rydb, Stem 4-6 dm. high, simple; lower leaves with peti- 

 oles, which are about 1 cm. long, the upper subsessile; blades ovate or hinco-ovate, 

 more or less cordate at the base, serrate, 4-G cm. lon^, sparingly silky-nilose on 

 both sides; corolla red-purple, almost wine-color, densely villose-puberulent. 

 Hillsides: Colo. Submont, Jl-Au. 



2. M. Ramaleyi A. Nels. Stem 3-6 dm. high, glabmtc below, softly Inn- 

 ately white-pubescent upwards; leaf-blades lanceolate or ovate-lanceolate, 

 rounded or truncate at the base, sharply serrate; corolla hlac-i)ur])le, softly 

 pubescent. Sandy soil: Colo, SubmonL Je. 



3. M. menthaefolia Benth. Stem 3-10 dm. high, finely puberulcnt; lonf- 

 blades short-petioled or the upper subsessile, ovate or ovate-lanceolate, at least 

 the lower cordate at the base, more or less cinereous, with short pubescence; 

 corolla rose or lilac, 2-2.5 cm. long. Hillsides and valleys: Sask.— Man.— 111.— 

 Tex.— Utah— Ida.— Alta. Plain— Mont, Je-Au. 



4. M. stricta Wooton. Stem 3-6 dm. high, slender, minutely pubescent; 

 leaf-blades ovate or deltoid-lanceolate, 4-6 cm. long, acuminate, shar}>lv serrate, 

 minutely pubescent on both sides or glabrate above; corolla bright purple. HiU- 

 sides: Wyo. — N.M. — Ariz. SubmonL Jl-S. 



5. M. mollis L. Stem 3-10 dm. high, finely pubescent; leaf-blades elongate 

 deltoid-lanceolate, sharply serrate, 2-5 cm. long, finely puberulent, often paler 

 beneath; corolla hlac, about 2.5 cm. long. Prairies and among bushes: Me. 

 Ga.— Tex.— B.C. Plain— SubmonL Je-Au. 



6. M. Dectinata Nutt, Annual or perennial (?), ^\^th a taproot; stems 



sun 



lanceolate or oblanceolate, distantly serrulate, minutely stngiUose or glabrate, 

 cihate on the margins, densely punctate, 2-4 cm. long; bracts 12-16 mm. long, 

 green or purplish, lanceolate or oblong, s}>inulose-cuspidate ; corolla yellowish 

 white 15-18 mm. long, puberulent. M, citriodora Coult. M, ^ulialhi A. JNels. 

 Plains, especially in sandy soil: Neb.— Tex.— Ariz.— Utah. Plain— SubmonL 



21. POLIOMINTHA A. Gray. 



Low sufTruticose canescent plants. Leaves opposite, entire. J^lowers per- 

 fect in small axillary cymes or glomerules, the floral leaves often reduced and 

 bract-like. Calvx cylindric, 13-15 striate, bearded in the throat, equally 5- 

 toothed. Corolla 2-lipped, ^\-ith two hair>' rings in the throat; upper hp erect, 

 emarginate; lower lip spreading, 3-cleft, the middle broad lobe emargmate. 

 Anther-bearing stamens 2; posterior filaments rudimentary, subulate. 



1 P incana (Torr.) A. Gray. Low shrub, 3-6 dm. high; branches silvery 

 w^hite, with fine toraentum, erect; leaves hnear or oblong, 5-20 mm. long, sessile 

 white^tomentulose; cah-x 15-ner%-ed, white-viUous, 6 mm. long; corolla about 1 

 cm long, rose or purp ish. Sand hills: w Tex,-s Colo.-s L tah-Ariz.; Mex. 



San. Ap-Au. 



22. HEDEOMA Pers. Mock Pennyroyal. 



Annual or perennial herbs, usually aromatic. Leaves opposite, small, entire 

 or sparingly toothed. Flowers perfect, in remote or contiguous, axdiary clus- 

 TJ'' C& 13.ribbed, commonly gibbous at tlie ^Z^:J>-^,^^^^^ 



purpl 



ent and usuallv longer than the 3 upper ones. CoroUa blue or purpie, ^-"PPe^. 

 twrbut Uttle enfarged; upper lip erect entire «f ^-lobed ; lo.-er hp 3-1^^^ 

 and spreading. Stamens 4, or usually only 2 fertile, the other with mucn re- 

 duced filaments or wanting. Nutlets smooth. 



