96 ORCHIDACEAE 



'Mo.—Pennsylva7iia: Monroe; Carbon; Susquehanna; Wayne; 

 Tioga ; Huntingdon ; Northampton ; Dei^aware ; Erie ; Mont- 

 gomery ; Lancaster; Lackawanna; Pike; Chester. 



13. ISOTRIA Raf. 



Lip crested along a narrow line above the face : pedicel as long as the capsule 

 or longer. i. /. verlicillata. 



Lip crested over the face and lobes : pedicel shorter than the capsule. 



2. /. affinis. 



1. Isotria verticellata ( Willd. ) Raf. Whorled Pogonia. (Man. p. 

 297 ; I. F. /. III.) In moist woods, Ont. to Wis., Ind. and Fla. — Penn- 

 sylvania : Northampton ; Chester ; Lancaster ; Lebanon ; Schuyx- 

 Kii,i. ; Huntingdon ; Centre ; Montgomery ; Somerset ; Dela- 

 ware ; Allegheny. 



2. Isotria affinis (.\ustin) Rydb. Smaller Whorled Pogonia. 

 (Man. p. 297 ; I. F. /. ///S.) In moist woods, Conn., Pa. and N.J. — 

 Pennsylvania : Monroe, W^ater Gap ; Berks ; Philadelphia. 



14. POGONIA Juss. 

 1. Pogonia ophioglossoides (L.) Ker. Rose Pogonia. (Man. p. 297 ; 

 I. F.y! iii-f.) In meadows and swamps, Newfoundland to Ont., Fla. 

 and Kans. Also in Japan. — Pennsylvania : Tioga ; Luzerne ; Monroe ; 

 Northampton; Bucks; Chester; Erie, Saunders; Montgomery; 

 Lancaster ; Berks ; Lackawanna ; Pike ; Delaware. 



15. TRIPHORA Nutt. 

 1. Triphora trianthophora (Sw.) Rydb. Nodding Pogonia. (Man. 

 p. 298; I. F. /. 1115.) In rich woods. Out. (?) to R. I. Fla., Wis. and 

 Kans. — Pennsylvania : Bucks ; Philadelphia ; Lehigh ; Lancaster ; 

 Northampton ; Chester ; Delaware. 



16. ARETHUSA L. 

 1. Arethusa bulbosa L. Arethusa. (Man. p. 298; I. F. /. 11 19.) 

 In bogs, Newfoundland to Minn., N. C. and Ind. — Pennsylvania: 

 Wayne ; Chester ; Lancaster. 



17. ACHROANTHES Raf. 

 Lip entire at the acute apex. 1. -^. monophylla. 



Lip 3-toothed at the broad apex. 2. A. unifolia. 



1. Achroanthes monophylla (L. ) Greene. White Adder's-mouTh. 

 (Man. p. 303 ; I. F./. 11134.) In woods, Quebec to Minn., Pa. and Neb. 

 — Pennsylva?iia : Wayne ; Centre ; Susquehanna. 



2. Achroanthes unifolia (Michx.) Greene. Green Adder's-mouTh. 

 (Man. p. 303; I. V. f. II3S-) In woods and thickets, Newf to Minn., 

 Fla., Ala. and Mo. — Pennsylvania : Wayne; Monroe; Lackawanna; 

 Philadelphia ; Lancaster ; Franklin ; Huntingdon ; Armstrong ; 

 Centre ; Mifflin ; Del.\ware. 



