104 MIDDLESEX FLORA. 



POGONIA, JUSS. 



P. ophioglossoides, Nutt. 

 Common. June-July. 



P. verticil lata, Nutt. 

 Ashby (VV. H. Manning) ; Tewksbuiy (Rev. H. C. Duganne) ; 

 Lowell (Dr. F. Nickersou) ; Billerica (Baldwin's Orchids of N. E.).' 

 Rare. May-June. 



Calopogon, R. Br. 



C. pulchellus, R. Br. 



Common. June-July. 



MiCROSTYLIS, Nutt. 



*M. ophioglossoides, Nutt. 



Wilmington (E. H. Hitehings and Miss M. E. Carter). "Very rare. 

 July. 



LiPARis, Rich. 



*L. llliifolia. Rich. Twayblade. 



Cambridge, (Bigelow's Fl. Bost.); Natick (Austin Bacon). Very 



rare. June. 

 L. Loeselii, Rich. 



Tewksbury and Chelmsford (Dr. C. W. Swan) ; Woburn (Miss 



M. E. Carter) ; Ashland (Rev. Thos. Morong) ; Belmont (C. E. 



Perkins); W. Medford (Mrs. P. D. Richards). Rare. June. 



CORALLORHIZA, Hall. 



C. innata, R. Br. 



Stonehaui and Medford (C. E. Perkins) ; Bedford (C. W. Jenks) ; 

 Natick (Baldwin's Orchids of N. E.) ; Tewksbury (B. D.Greene). 

 May-June. 

 C. multiflora, Nutt. 

 Rather common. July-Sept. 



Cypripedium, L. 



* C. arietinum R. Br. Ram's-head Lady's Slipper. 



Concord, introduced from Vermont by Miiiot Pratt. June. 

 C. parviflorum, Salisb. Smaller Yellow Lady's Slipper. 



Groton (Miss. H. E. Haynes) ; Westford (Baldwin's Orchids of 



N. E.) ; Acton (Walter Deane; specimen in herb, of); Concord, 



introduced by Minot Pratt. Very rare. June. 

 C. pubescens, Willd. Larger Yellow Lady's Slipper. 



Reading and Lexington (Baldwin's Orchids of N. E.) ; Ashland 



(Rev. Thos. Morong) ; Stowe (Walter Deane ; specimen in herb, of) ; 



Concord, introduced by Minot Pratt. Very rare. June. 



