MINT FAMILY 749 



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



3. M. menthae 'folia. 

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



4. M. stricta. 

 Petioles 1-3 cm. long. 5. M. mollis. 



Heads or yerticillate glomerules several in the upper axils of the leaves ; stamens scarcely 

 exceeding the emarginate or cleft upper lip of the corolla. 6. M. 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 lance-ovate, 

 more or less cordate at the base, serrate, 4-6 cm. long, sparingly silky-pilose 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, glabrate below, softly lan- 

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

 rounded or truncate at the base, sharply serrate; corolla lilac-purple, softly 

 pubescent. Sandy soil: Colo. Submont. Je. 



3. M. menthaefolia Benth. Stem 3-10 dm. high, finely puberulent; leaf- 

 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, sharply serrate, 

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

 sides: Wyo. N.M. Ariz. Submont. Jl-S. 



6. 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 lilac, about 2.5 cm. long. Prairies and among bushes: Me. 

 Ga. Tex. B.C. Plain Submont. Je-Au. 



6. M. pectinata Nutt. Annual or perennial (?), with a taproot; stems 

 simple or branched at the base, 2-4 dm. high, canescent-strigose ; leaf-blades 

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

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

 green or purplish, lanceolate or oblong, spinulose-cuspidate; corolla yellowish 

 white, 15-18 mm. long, puberulent. M . citriodora Coult. M. Nuttallii A. Nels. 

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



21. POLIOMINTHA A. Gray. 



Low suffruticose canescent plants. Leaves opposite, entire. Flowers per- 

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

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

 toothed. Corolla 2-lipped, with two hairy rings in the throat; upper lip erect, 

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

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



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

 white, with fine tomentum, erect; leaves linear or oblong, 5-20 mm. long, sessile, 

 white-tomentulose; calyx 15-nerved, white-villous, 6 mm. long; corolla about 1 

 cm. long, rose or purplish. Sand hills: w Tex. s Colo. s Utah Ariz.; Mex. 

 Son. 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 axillary clus- 

 ters. Calyx 13-ribbed, commonly gibbous at the base, pubescent in the more or 

 less constricted throat, somewhat 2-lipped, the 2 lower calyx-lobes being differ- 

 ent and usually longer than the 3 upper ones. Corolla blue or purple, 2-lipped; 

 throat but little enlarged; upper lip erect, entire or 2-lobed; lower lip 3-lobed 

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

 duced filaments or wanting. Nutlets smooth. 



