134 Karl M. Wiegand and Arthur J. Eames 



111. C. Grayii Carey. 



Alluvial woods and meadows ; scarce. June 20-Aug. 



Renwick woods; Freeville, s. of Fir Tree Swamp (D.) ; Big Gully Point; Utt 

 Point; roadside ditch w. of Rowland Island; two miles n. of Montezuma; Galen, 

 abundant on the Clyde River flats. 



Vt. to Mich., southw. to Ga. and Mo. ; absent on the Coastal Plain. A plant of 

 the richer soils of the interior. 



20. ARACEAE (Arum Family) 



a. Spadix subtended by a spathe ; leaves broad. 

 b. Spathe enveloping the spadix. 



c. Spadix elongated ; perianth wanting ; plant monoecious or dioecious. 

 d. Upper part of the spadix not flower-bearing, smooth ; leaves deeply divided 



or compound. 1. Arisaema 



d. Upper part of the spadix, as well as the lower part, flower -bearing ; leaves 

 simple, sagittate. 2. Peltandra 



c. Spadix globular; perianth present; plant with perfect flowers. 



3. Svmplocarpus 

 b. Spathe flat, divaricate or reflexed ; flowers perfect, without perianth. 



4. Calla 



a. Spadix naked, without an obvious spathe, cylindrical; flowers perfect, with perianth; 

 leaves linear. 5. Acorus 



1. Arisaema Mart. 



a. Leaves 3-foliolate, not pedate; spathe hooded, the hood 2-5 cm. wide, short- 

 acuminate ; spadix blunt. 

 b. Tube of the spathe not fluted, usually indistinctly striped; margins of tube at 

 summit contiguous, often overlapping, conspicuously flaring; leaves glaucous 

 beneath. 1. A. triphyllum 



b. Tube of the spathe fluted, green-and-white striped ; margins of tube at summit 

 with a more V-shaped opening between them, less flaring ; leaves green beneath. 



la. A. t., var. Stewardsonii 

 a. Leaves pedately 7-11-foliolate; spathe straight, narrow; spadix ending in a very 

 long caudate tip. 2. A. Dracontium 



1. A. triphyllum (L.) Schott. Indian Turnip. Jack-in-the-Pulpit. 



Woodlands, in damp rich mucky soil and humus ; frequent in ravines and in the 

 vicinity of swamps, but generally absent from boggy places. May. 



N. S. to Minn., southw. to Fla., La., and Kans., including the Coastal Plain. 



It has not been possible to separate A. pusillum (Peck) Nash in this region from 

 this species by any constant characters. 



la. A. triphyllum (L.) Schott, var. Stewardsonii (Britton) G T. Stevens. (See 

 Britton & Brown, 111. Fl., ed. 2, 1:443. 1913. Rhodora 23: 136. 1921. A Stew- 

 ardsonii Britton.) 



Mossy and boggy swamps, in calcareous regions, rarely in somewhat drier situa- 

 tions ; frequent. May. 



Headwaters Swamp; Michigan Hollow Swamp; between Slaterville and Dryden 

 Lake; Renwick woods; Ellis Hollow Swamp; Ringwood ; McLean Bogs; Howland 

 Island; Montezuma flats; Clyde River flats. 



N. S. to N. J. and Pa. ; probably rare or absent on the Coastal Plain. 



Generally in this region A. Stezvardsonii is distinct from A. triphyllum, having 

 the characters given in the key and inhabiting boggy soils ; but occasional plants are 

 found in less boggy places, and these often combine in different ways the characters 



