ECOLOGY OF ISLE ROYALE. 239 



202. Unifolvum canadense (Desf.) Greene. False Lily-of-Valley, Two- 

 leaved Solomon's Seal. Rather open patches in rich, moist woods. I, 

 4; II, 2. 



203. Streptopus ampleaoicauUs (L) DC. Clasping-leaved Twisted- 

 stalk. Woods along portage to Siskowit Lake (V, 9). 



204. Trillium grandiflorum (Michx.) Salisb. Showy, White Trillium. 

 Flood plain of tWashington Creek. 



Iridaceae — Iris Family. 



205. Iris versicolor L. Larger Blue Flag. Common in low wet 

 places, as lake and bog margins. V, 5; III, 5; II, 5. 



Orchidaceae — Orchid Family. 



206. Cypripedium reginae Walt. Showy Ladies-Slipper. Wet places 

 in woods: not abundant. II, 1; near II, 5. 



207. Cypripedium Mrsutum Mill. Larger Yellow Ladies-Slipper. In 

 drier parts of woods than preceding. IV, 4. 



208. Orchis rotundifolia. Pursh. Small Eound-leaved Orchild. Rare: 

 tamarack forest. 



209. Halienaria orMculata (Pursh) Torr. Large Eound-leaved 

 Orchid. Rich woods near IV, 2; few localities. 



210. Haienaria oMusata (Pursh) Richards. Small Northern Bog 

 Orchid. Fairly common in forested bog margins, and bog forests. I, 

 4; II, 2; V, 5. 



211. Hahenaria hyperhorea (L) R. Br. Tall Leafy Green Orchid. 

 Bogs and wet woods : margin of Sumner Lake, II, 5. 



212. Hahenaria dilatata (Pursh) Hook. Tall White Bog Orchid. 

 Trembling bog margins of Forbes and Sumner Lakes, very abundant 

 in latter place. II, 5; III, 5. 



213. Habenaria psycodes (L) Gray. Smaller Purple-fringed Orchid. 

 Associated with E. dilatata as given above, and also abundant. Ill, o; 

 II, 5. 



214. Pogonia ophioglossoides (L) Ker. Rose Pogonia. Common 

 along wet bog margins. Ill, 5 ; II, 5. 



215. Arethus'a hulhosa L. Arethusa. Wet bog margins. Not so 

 common as preceding species. 



216. Gyrostachys romansoffiana (Cham.) MacM. Wet margins of 

 Sumner Lake and Forbes Lake. 



217. Listera cordata, (L) R. Br. Heart-leaved Twayblade. Moist 

 woods and ravines. 



218. Peramvwm repens (L) Salisb. Lesser Rattle-snake Plantain. 

 Cabin trail woods, V, 4, Siskowit. 



219. Peramium pubescens (Willd.) MacM. Downy Rattle-snake 

 Plantain. Rather dry woods. V, 4, III, 4. 



220. Peramium, menziesii (Lindl.) Morong. Menzies' Rattle-snake 

 Plantain. Rich woods. V, 4; III, 4. 



221. Acroanthes monophylla (L) Greene. ( ?) Sumner Lake mar- 

 gin. Ill, 5. 



222. Leptorchis liliifoUa (L) Kuntze. Large Twayblade. Moist 

 Avoods and along bog margins. Woods of I. 



