104 MIDDLBSEX FLORA. 



POGONIA, JuSS. 



P. ophioglossoides, Nutt. 

 Common. June-July. 



P. verticillata, Nutt. 

 Ashby (W. H. Manning) ; Tewksbury (Eev. H. C. Duganne) ; 

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

 Bare. May-June. 



Calopogon, R. Br. 



C pulchellus, R. Br. 



Common. June-July. 



MiCROSTTLIS, Nutt. 



*M. ophioglossoides, Nutt. 



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

 July. 



LiPAEis, Rich. 



*L. liliifolia. Rich. Twatblade. 



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. 



CORALLOKHIZA, Hall. 



C. innata, R. Br. 



Stoneham 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. 



Ctpeipedium, L. 



*C arietinum IL. Br. Ram's-head Lady's Slippek. 



Concord, introduced from Vermont by Minot 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. Laegeb 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 I-'ratt. Very rare. June. 



