638 Rydberg : Rocky Mountain' flora 



Mertensia picta sp. nov. 



Perennial, perfectly glabrous, except the hispidulous-ciliate 

 margins of the leaves and calyx-lobes ; stem 3-5 dm. high, pale 

 and somewhat bluish below, more or less angled; lower leaves 

 petioled ; blades oval or elliptic-ovate, 5-9 cm. long, obtuse or 

 acutish, rounded or somewhat truncate at the base, finely pustu- 

 late but not hairy on the surfaces, thin ; upper leaves lanceolate or 

 ovate-lanceolate and subsessile ; inflorescence leafy and with short 

 branches ; pedicels and calyx more or less pustulate ; calyx-lobes 

 linear-oblong, obtuse, in fruit nearly 2 mm. long, the back with 

 a thickened pale spot ; corolla blue ; its tube 6-7 mm. long and 

 2-3 mm. wide ; throat and limb together 5-6 mm. long, the latter 

 about 5 mm. wide ; filaments dilated, about 2 mm. long and wider 

 than the anthers ; nutlets ovate in outline, strongly and irregularly 

 reticulate- crested on the back. 



This is closely related to M. ciliata but distinguished by the 

 pale-spotted and thickened calyx-lobes. 



Colorado : Estes Park, Larimer County, 1903, Ostcrlwut 

 28 2 j (type); Mount Baldy, 1901, Clements 288. 



Mertensia polyphylla platensis var. nov. 



Like the species, but the calyx-lobes linear, fully 3 mm. long ; 

 basal leaves large ; blades about 1 dm. long, cordate at the base 

 and cuspidate at the apex. 



Along streams at an altitude of 3000 m. 



Colorado: Bob Creek, La Plata Mountains, 1898, Baker, 

 Earle & Tracy j8o (in part). 



Mertensia alba sp. nov. 



Perennial ; stem pale, 6-8 dm. high, more or less branched ; 

 lower leaves petioled, upper sessile ; blades lanceolate or elliptic- 

 lanceolate, acute or acuminate at both ends, glabrous beneath, his- 

 pidulous-strigose above and on the margins ; pedicels and calyx 

 strigose ; lobes linear-lanceolate, acute, about half as long as the 

 tube of the white corolla ; corolla-tube about 8 mm. long, and 4 

 mm. wide ; throat and limb together of about the same length ; 

 the latter 8-10 mm. wide ; nutlets irregularly crested-tuberculated, 

 and finely pubescent. 



This is a species of the M. paniculata group and nearest related 

 to M. pratensis, but it lacks the dense white pubescence of the 

 calyx characterizing that species and the corolla in all specimens 

 seen is white. 



Colorado: La Plata River, 1898, Baker, Earle & Tracy 



