WOOTON AND STANDLEY FLORA OF NEW MEXICO. 541 



Range: Mountains of New Mexico and Arizona. 



New Mexico: Pinoa Altos Mountains; Lookout Mines; Holts Ranch; Hanover 

 Mountain; White Mountains. Transition Zone. 



This is evidently near L. floribunda, but differs in foliage characters. Piper ^ sepa- 

 rates the two by differences in the corolla appendages, but the distinctions used by 

 him in his key seem to us not to exist in the plants. 



3. MERTENSIA Roth. Lungwort. 



Perennial herbs, 1 meter high or less, with alternate simple leaves and blue, pink, 

 or white flowers in paniculate terminal clusters; calyx lobes narrow, usually somewhat 

 enlarged in fruit; corolla tubular to funnelform-campanulate, the limb 5-lobed, with 

 small crests in the throat; stamens included, at least not surpassing the limb; ovary 

 4-parted, the nutlets attached laterally near the base to a slightly elevated receptacle. 



KEY TO THE SPECIES. 



Leaves glabrous on both surfaces, glaucous, thick and fleshy... 1. M. caelestina. 

 Leaves pubescent on one or both surfaces, or at least pustulate, 

 not glaucous above, thin. 

 Leaves densely pubescent on both surfaces. 



Stems in dense clumps from a woody base 2. M. amoena. 



Stems mostly solitary, never in clumps from a woody 

 base. 

 Calyx lobes densely pubescent, not hispid-ciliate; 



basal leaves numerous 3. M. amplifolia. 



Calyx lobes glabra te on the back, hispid-ciliate; 



basal leaves usually wanting 4. M. lateriflora. 



Leaves glabrous beneath or nearly so. 



Calyx divided to about the middle; plants low, 30 cm. 



high or less 5. M. fendleri. 



Calyx divided almost to the base; plants 40 to 100 cm. 

 high. 

 Leaves merely pustulate on the upper surface, 

 somewhat glaucous beneath; calyx lobes his- 

 pid-ciliate 6. M. cynoglossoides. 



Leaves pubescent on the upper surface, green on 

 both sides; calyx lobes not hispid-ciliate. 

 Calyx lobes lanceolate, acute; most of the cau- 

 line leaves petioled or narrowed at the 

 base ; tube and limb of corolla abou t equal . 7 . M. pratensis . 

 Calyx lobes oblong, mostly obtuse; cauline 

 leaves broad and sessile at the base; 

 limb of the corolla much shorter than 

 the tube 8. M. grandis. 



1. Mertensia caelestina Nels. & Cockerell, Proc. Biol. Soc. Washington 16: 46. 

 1903. 



Type locality: Truchas Peaks, above timber line, New Mexico. Type collected 

 by Mrs. W. P. Cockerell. 



Range: Northern New Mexico. 



New Mexico: Truchas Peak; Taos Mountains. Mountain peaks, in the Arctic- 

 Alpine Zone. 



1 Bull. Torrey Club 29: 536. 1902. 



