

Ryduerg : Studies on the Rocky Mountain Flora 33 



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upper leaves : pedicels very short, often sparingly strigulose : calyx 

 divided to near the base ; sepals oblong, obtuse, ciliate on the 

 margins, 2-3 mm. long, scarcely more than half as long as the 

 tube of the corolla : corolla dark blue, about 7 mm. long : tube 

 nearly equaling the throat and limb : stamens short, included in 

 the tube, filaments very short, not broader than the anthers. 



This species is nearest related to M. Tweedyi, but differs in 



the shorter, obtuse calyx-lobes, the broader and thinner leaves 



and the stem which is not depressed or prostrate. It grows at an 



altitude of 2000-3500 m. 



Colorado: Pikes Peak, 1900, Fred. Clements (type); Garden 

 of the Gods and Pikes Peak, 1894, Ernst A. Bessey ; Argentine 

 Pass, 1878, Marcus E. Jones, 54. 



^Mertensia membranacea sp. no v. 



A tall erect perennial with a rather thick tap-root. Stem gla- 

 brous or sparingly hirsute above, 6-8 dm. high : leaves all petioled, 

 or the upper sessile ; blades ovate, acute or more often short acu- 

 minate, 4-8 cm. long, 1.5-4 cm. wide, very thin, hispid-stringulose 

 on both sides : flower-clusters terminal and in the axils of the upper 

 leaves, branched and many-flowered : pedicels 5-10 mm. long, his- 

 pidulous: calyx-lobes 2-3 mm. long, hispidulous, lanceolate, acute, 

 one-third or one-fourth as long as the tube of the corolla : corolla 

 about 1 cm. long ; the pale blue or almost white tube longer than 

 the dark blue limb and throat : limb about 4 mm. broad : stamens 

 much shorter than the limb ; filaments dilated and broader than 

 the anthers : nutlets strongly rugose and spotted. 



This species is related to M. paniculata. Mr. Bessey and my- 

 self collected it in 1897, but as the specimens were rather poor, 

 they were referred doubtfully to that species, 

 ter specimens have now been received, it has been possible to draw 

 a description. It diners from M. paniculata, in the thinner leaves 

 which almost always show an acumination, in the short calyx-lobes 

 which scarcely enlarge in fruit and the smaller and numerous 

 flowers. It grows in moist places at an altitude of 300-2000 m. 



Idaho : Priest River, 1900, D. T. MacDougal, j (type) ; Cedar 

 Mountain, 1892, Sandbeig, MacDougal & Heller, 420. 



As 



Montana : Electric 



& 



Mentzelia ctenophora sp. nov. 



A 



~ diffuse cespitose scabrous perennial. Stems 3-6 dm. long, 

 branched, in age straw-colored : lower leaves linear or linear-ian- 



