269 Rydberg: Studies on the Rocky Mountain Flora 



green, sessile, long-acute, with 3—5 stronger nerves and 12—14 

 weaker ones : raceme terminal, simple, 3-6-flowered : pedicels 

 5—8 mm. long : petals and sepals linear, acute, about 4 mm. long 

 and less than i mm. wide, very thin, white : fruit not seen. 



This species is nearly related to V. stcllata and V. lUiacca, but 

 differs in the narrow petals and sepals, the slender rootstock and 

 the lighter green foliage. It grows in rich soil in caiions at an 

 altitude of 2000-2100 m. 



Colorado: Headwarters of Sangre de Christo Creek, 1900, 

 Rydberg & Vreeland, 64^ r (type); Dark Caiion, Pikes Peak, 

 1900, Fj-cd Clements. 



Limnorchis purpurascens sp. nov. 



A rather stout plant, 3-5 dm. high, with fleshy-fibrous roots. 

 Leaves ovate to lanceolate, acute, 6—10 cm. long, 1.5—3 cm. wide, 

 dark green : bracts lanceolate, the lower exceeding the flowers : 

 spike rather dense : flowers 10— 12 mm. long : lateral sepals green, 

 oblong-linear, or linear, obtuse, 4-5 mm. long ; the upper sepal 

 tinged with purple, broadly ovate, erect, obtuse : petals slightly 

 shorter, erect, purple, lanceolate, oblique : lip broadly linear-lan- 

 ceolate, about 5 mm. long, purplish, scarcely at all dilated at the 

 base, the edges almost straight : spur scarcely more than half as 

 long as the lip, much thickened and saccate. 



This species belongs to the L. Jiyperborea group, and is perhaps 

 nearest related to that species. It differs, however, in the purple 

 petals and lip and the shorter and more saccate spur. The spur 

 has almost the same form as that of L. stricta ; but from that 

 species it differs in the dense spike and the broader lip. L. pur- 

 purascens grows in damp woods at an altitude of 2700-3000 m. 



Colorado: Iron Mountain, 1900, Rydberg & Vreeland, 6^1^ 

 (type); Manitou, 1900, /vyv/ Clements, iy2 ; Georgetown, 1878, 

 M. E. Jones, j/7. 



Piperia gen. nov. 



Montolivaea Rydb. Mem. N. Y. Bot. Card, i : 106. 1900. 

 Not Reichenb. 



Professor C. V. Piper of the Agricultural Experiment Station 

 at Pullman, Washington, has called my attention to the fact that 

 the genus Montolivaea was based not on Platanthera elegans Lindley, 

 or Habenaria eleenns Bolander ; but on Montolivaea elczaiis Reich- 



