90 ORCHIDACEAE 



1. Sisjrrinchium mucronatum Michx. MiCHAUX's Bi,UE-EYED Grass. 

 (Man. p. 286.) In meadows and fields, Mich, to N. J. and Va. — Penn- 

 sylvania : Monroe ; Pike. 



2. Sisyrinchium angustifoUum Mill. Pointed Bi,ue eyed Grass. 

 (Man. p. 286 ; I. F. /. 108^.) In fields, Newf. to B. C, Va., Kans. and 

 Colo. — Pennsylvania : Monroe ; Northampton ; Dei,aware ; Frank- 

 iviN ; I/ANCASTER ; ERIE ; Chester ; Allegheny. 



3. Siayrlnohium graminoides Bicknell. STouT Blue-eyed Grass. 

 (Man. p. 287 ; I. F./. /oS^. ) In grassy places, sometimes in woods, Mass. 

 to Fla. and La. — Pennsylvania : Monroe ; Northampton ; Armstrong; 

 Lancaster ; Pike ; Montgomery ; Chester ; Delaware ; Alle- 

 gheny. 



4. Sisyrinchium Atlanticum Bicknell. Eastern Blue-Eyed Grass. 

 (Man. p. 287 ; I. F./. /084.) In moist fields and brackish marshes, Newf. 

 to Fla. , mostly near the coast. — Pennsylvania . Bucks, Penn Valley. 



3. IRIS Iv. 



Plants usually over 3 dm. tall : outer perianth-lobes larger than the inner. 



Leaf-blades over i cm. wide. i, /. versicolor. 



Leaf-blades less than i cm. wide. 2. /. prismatica. 



Plants usually less than i dm. tall : outer and inner perianth-lobes nearly equal. 



3. /. verna. 



1. Iris versicolor L. Larger Blue-flag. (Man. p. 282 ; I. F. /. 

 io6g.) In marshes and wet meadows, Newf. to Man., Fla. and Ark. — 

 Pennsylvania: Monroe; Northampton; Lancaster; Huntingdon; 

 Perry ; Erie ; Chester ; Allegheny. 



2. Iris prismatica Pursh. SlEnder BluE-FLAG. (Man. p. 283 ; I. F. 

 f. 10^4. ) In wet grounds,, N. B. to Pa. and N. C. , mainly near the coast. 

 — Pennsylvania : Lancaster, New Texas ; Delaware ; Chester. 



3. Iris verna L. Dwarf Iris. (Man. p. 284; I. F. / 1080.) On 

 shaded hillsides and in woods. Pa. to Ga. and Ky. — Pennsylvania : Lan- 

 caster, Wakefield. 



Order 10. ORCHIDALES. 



Family i. ORCHIDACEAE Lindl. Orchid Family. 



Anthers 2 ; lip a large inflated sac. i. Cypripedium. 



Anther solitary : lip various. 

 A. Anther adnate to the column, erect, persistent, 

 a. Lip with a tubular spur at the base : anther adnate to the apex of the 

 column ; sacs separate. 

 Glands of the stigma enclosed in a pouch. 2. Galeorchis. 



Glands of the stigma not enclosed in a pouch. 

 * Lip or its lobes neither laciniate nor fringed. 

 Anther-sacs mostly parallel : stems not scape-like. 



Valves of the anthers dilated at the base, enclosing the glands h^- 



l°w. 3. Perularia. 



Valves of the anthers not dilated at the base. 

 Glands of the stigmas surrounded by a thin membrane. 



4. COELOGLOSSUM, 



