72 ARACEAE 



Order 6. ARALES. ^ 



Plants terrestrial or aquatic with the flowers in a spadix, which is sometimes 

 subtended by or partly enclosed in a spathe. Fam. i. Araceae. 



Plants reduced to small floating thalloid structures, with one or few flowers in 

 a minute pouch. Fam. 2. Lemnaceae. 



Family i. ARACEAE Neck. Arum Family. 

 Flowers monoecious or dioecious, or the lower ones perfect {Calla): perianth 

 wanting. 

 Leaf-blades 3-many-divided or foliolate : axis of the spadix naked above. 



1. Arisaema» 

 Leaf-blades simple : axis of the spadix completely covered with flowers. 



Spathe wholly or partially convolute : flowers monoecious. 



2. Peltandra. 

 Spathe not convolute : lower flowers perfect. 3. Calla. 



Flowers perfect : perianth of se%'eral scale-like members. 

 Spadix surrounded by a spathe. 4. Spathyema. 



Spadix naked, merely subtended by a spathe. 



Spadix terminating the club-shaped scape. 5. Orontium. 



Spadix borne somewhat laterally on the leaf-like scape. 6. AcoRUS. 



1. ARISAEMA Mart. 



Leaf-blades palmately 3-divided : spathe involute below, hooded above : spadix 

 included, terete or obscurely angled. 

 Spathe with the convolute part even. i. A. triphyllum. 



Spathe with the convolute part fluted. 2. A. Sleuardsonii. 



Leaf-blades pedately divided : spathe convolute throughout: spadix exserted, 

 more or less flattened or 2-edged. 3. A. Dracontiuni. 



1. Arisaema triphyllum (L.) Terr. J.\ck-in-The-puIvPit. Indian 

 Turnip. (Man. p. 229; I. F. /. 8j6.) In moist woods, N. S. to Fla., 

 Minn., Kans. and La. — Pennsylvania: Northampton; Monroe; 

 ScHUYLKiix ; Chester ; Lancaster ; Franklin ; Delaware. 



2. Arisaema Ste-wrardsonil Britten. Stewardson Brown's Indl\n 

 Turnip. (Man. p. 1045.) In wet woods, eastern Pa. — Pennsylvania: 

 Monroe, Tannersville ; Sullivan. 



2. Arisaema Dracontium ( L. ) Schott. Green Dragon. (Man. p. 

 230 ; I. F. /. Sj7.) Mostly in wet woods. Me. to Minn., Fla. and Tex. — 

 Pennsylvania : Erie ; Susquehanna ; Lancaster ; Chester ; Dela- 

 ware ; Allegheny. 



2. PELTANDRA Raf. 



1. Peltandra Virginica (L.) Kunth. Green Arrow-arum. (Man- 

 p. 230; I. F.y. SjS.) In swamps or shallow water, Me. to Mich., Fla. 

 and La. —Pennsylvania : Monroe, Tannersville ; Dauphin, Harrisburg ; 

 Delaware, Tinicum ; Pike ; Chester ; Erie. 



3. CALLA L. 



1. Calla palustris L. Water Arum. (Man. p. 230; I. F. /. 880.) 

 In bogs, N. S. to Minn., Va. and Iowa. — Pentisylvatiia : Erie ; Monroe ; 

 Northampton ; Pike ; Susouehanna. 



