686 Rydberg: Rocky Mountain flora 



Madronella oblongifolia sp, nov. 



Perennial, sufifruticose at the base; stems 1-3 dm. high, gray- 

 ish puberulent or in age glabrate ; leaf-blades oblong, 1-3 cm. 

 long, minutely puberulent, or in age glabrate, entire, obtuse, 

 usually with distinct, but short, slender petioles ; bracts pale or 

 tinged with rose, finely puberulent, ciliate on the margins, oval, 

 9-12 mm. long; calyx about I cm. long, pilose; its teeth lance- 

 olate, and strongly ciliate; corolla white to rose-colored, 12-14 

 mm. long, puberulent. 



This has been confused with M, odoratissima^ but differs in 

 the shorter pubescence, which is sometimes wholly lacking on the 

 older leaves, the merely puberulent instead of pilose bracts, the 

 more distinctly petioled leaves, and more suffruticose habit. It 

 grows on mountain sides at an altitude of 1500-3000 m. 



Utah : Mount Nebo, 1905, Rydberg & Carlton yyo6 (type, in 

 herb. N. Y. Bot. Gard.), yj^y and Jjoo ; mountains north of Bul- 

 hon Creek, near Marysvale, yijS; American Fork, 1885, Leonard 

 lyS ; Logan, Aug. 9, 1895, Shear J164. ; same locality and date, 

 Rydberg; Alta, July 30, 1879, M. E. Jones nog ; Central Utah, 

 1873, P'^^'U 75- 



Mentha glabrior (Hook.) Rydb. sp. nov. 



Mentha canadensis glabrata Benth. Lab. 181. 1833. Not M, 

 glabrata Vahl. 1794. 



Mentha canadensis glabrior Hook. Fl. Bor.-Am. 2: ill. 

 1838. 



Mentha canadensis borealis Piper, Contr. U. S. Nat. Herb, il : 

 492, in part. 1906. Not M. borealis Michx. 1803. 



This differs from Mentha canadensis in the almost glabrous 

 leaves and stem, and much shorter pubescence on the calyx. 

 Recently several botanists have included M. Penardi {M. arvensis 

 Penardi Briq.) in M. canadetisis glabrata or M. arvensis glabrata, 

 but I think they are distinct, \nM. Penardi the leaves have much 

 shorter petioles, nearly always shorter than the flower-clusters, 

 the stem is more hairy and the calyx-teeth are lanceolate and 

 acute, much longer than broad. M. glabrior has the abruptly 

 acuminate calyx-lobes of M. canadoisis but they are not so short. 

 This species has been taken as M, borealis Michx., and even Ben- 

 tham cited the latter as a synonym, but by reading Michaux's 



