90 ORCHIDACEAE 



1. Sisjnrinchium mucronatum Michx. Michaux's Blue-EVED Grass. 

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

 sylvania : Monroe ; Pike. 



2. Sisyrlnchium angxistlfolium Mill. Pointed Blue eyed Grass. 

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

 Colo. — Pennsylvania : Monroe ; Northampton ; Delaw.\re ; Frank- 

 lin ; Lancaster ; Erie ; Chester ; Allegheny. 



3. Sisyrinchium graminoides Bicknell. Stout Blue-eyed Grass. 

 (Man. p. 287 ; I. F.y". /oSj. ) 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. y. /0S4. ) In moist fields and brackish marshes, Newf. 

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



3. IRIS L. 



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. y. 

 1069.) In marshes and wet meadows, Newf. to Man., Fla. and Ark. — 

 Pennsylvania : Monroe ; Northampton ; Lanca.ster ; Huntingdon ; 

 Perry ; Erie ; Chester ; Allegheny. 



2. Iris prismatica Pursh. Slender Blue-i-LAG. (Man. p. 2S3 ; I. F. 

 f. 10J4.) 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. yi 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. Cvpripedium. 



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. Galkorchis. 



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 be- 

 low. 3. Perularia. 

 Valves of the anthers not dilated at the base. 



Glands of the stigmas surrounded by a thin membrane. 



4. COELOGLOSSUM. 



