ORCHIDACEAE. 89 



7. IBIDIUM Salisb. Ladies' Tresses. 



Callosities at the base of the lip obsolete ; lower sepals coherent with the petals 



and upper sepal. i. G. stricta. 



Callosities nipple-shaped, directed downward; lower sepals free. 



2. G. porrifolia. 



1. Ibidium strictum (Rydb.) House. (Spiranfhes RomamoMana of Coul- 

 ter's Man.; not Cham.; Gyrostachys stricta Rydb.) In springy places, rich 

 hillsides and open woods from Newf. to Alaska, Pa. and Colo. — Alt. 5000- 

 10,000 ft, — Gunnison; West Cliff; Cabin Caiion; Jack's Cabin; Parlin; Waha- 

 toya Creek; Marshall Pass; Twin Lakes; Empire. 



2. Ibidium porrifolium (Lind.) Rydb. In marshes from Ida. to Wash., 

 Colo, and Cal. — Camp Harding, near Pike's Peak. 



8. OPHEYS (Tourn.) L. Twayblade. 



Lip broad at the base, with distinct auricles, slightly cleft at the apex ; leaves 

 oblong to oval. i. L. borealis. 



Lip narrow and narrowed at the base, 2-cIeft for about half its length into linear- 

 lanceolate lobes, without auricles, but with a pair of divergent teeth ; leaves 

 reniform. 2. L. nephrophylla. 



1. Ophrys borealis (Morong) Rydb. (Listera borealis Morong) In woods 

 from Hudson Bay to the Mackenzie and Mont.; also in Colo. — Saguache 

 Range. 



2. Ophrys nephrophylla Rydb. (Listera cordata Am. auth., partly; not R. 

 Br. ; Listera nephrophylla Rydb.) In woods from Mont, to Alaska, Colo, 

 and Ore. — Alt. 10,000-11,500 ft. — Larimer Co.; Slide Rock Cafion, West La 

 Plata Mountains; Beaver Creek; Franklin. 



9. PERAMIUM Salisb. Rattle-snake Plantain. 



Lip evidently sackate, with recurved margins. i. P. ophiodes. 



Lip scarcely sackate, with incurved margins. .i. P. Memiesii. 



1. Peramium ophioides (Fernald) Rydb. In woods from Prince Edwards 

 Island to the Black Hills of S. D., N. C. and Colo.— Alt. about 8500 ft.— 

 Minnehaha; Pike's Peak. 



2. Peramium Menziesii (Lindl.) Morong. (Goodyeara Menziesii Lindl.) 

 In mountain woods from Que. to B. C, N. Y. and Calif. — Alt. 7500-9000 ft.^ 

 Mt. Abram, Ouary; Pagosa Peak. 



10. ACROANTHES Raf. Adders' Mouth. 



I. Acroanthes monophylla (L.) Greene. In woods from Que. to Minn., 

 Pa. and Colo. — Alt. about 7500 ft. — Glen Mountain Falls. 



II. CYTHEREA Salisb. Calypso. 



1. Cytherea bulbosa (L.) House. (Calypso borealis Salisb.) In cold 

 woods from Lab. to Alaska, Me. and Calif. — Alt. 8000-10,000 ft. — Telluride; 

 East Indian Creek. 



