96 UNIVERSITY OF MISSOURI STUDIES [244 



279. L. borealis (Cham.) Rydb. Northern bog orchis. 

 Springs on mountainside at Eldora, 8600-10000 ft. (Dan- 

 iels, 842). 



Montana to Alaska; Colorado to Washington. 



280. L. laxiflora Rydb. Loose-flowered bog orchis. 

 Common in deep mountain canons, 6500-10000 ft. (Dan- 

 iels, 602). 



Oregon to Colorado and Utah. 



105. PIPERIA Rydb. Piper's orchis. 



281. P. Xlnalaschensis (Spreng.) Rydb. [Habenaria Una- 

 laschensis S. Wats.] Alaskan Piper's orchis. 



Under pines on north slope of Green Mt., very rare, 6000- 

 8100 ft. (Daniels, 470). Also on South Boulder Peak, S500 

 ft. (Rydberg). 



Montana to Alaska; Colorado to California. 



106. IBIDniM Salisb. Ladies' tresses. 



282. I. Romanzoffianum strictum (Rydb.) Daniels. Nov. 

 comb. [^Gj/rostac/ij/s stricta Rydb.] Narrow - spiked 

 ladies' tresses. 



One plant in a deep canon on the north slope of Green 

 Mt.; common in springy bogs at Eldora, 7000-10000 ft. 

 (Daniels, 769). 



Newfoundland to Alaska; Pennsylvania to Colorado. 



107. OPHRYS (Tourn.) L. Twayblade. 



283. 0. borealis (Morong) Rydb. [Listera borealis Morong]. 

 Northern twayblade. 



Deep canons on north slope of Green Mt., very rare, 6500- 

 8100 ft (Daniels, 607). 



Hudson Bay to Mackenzie; Colorado to Montana. 



283^. 0. nephrophyUa Rydb. [Listera nephrophylla Rydb.] 

 Kidney-leaved twayblade. 

 Redrock lake loioo ft. (Ramaley and Robbins). 

 Alaska to Colorado and Oregon. 



