318 OKDEB 130. ARACEJB. 



1. PISTIA, L. Spathe tubular at base, spreading above. Fls. 8 , few, 

 the upper $ in an involucre, of 38 anther-cells. $ Fl. solitary, of a 1- 

 celled ovaiy and thick style. Berry several-seeded, xr 



P. Bpatkulata MX. Floating free in still water ; leaves 12', obovate-spatnlate, rosu- 

 late, the veins lamellated beneath ; Bpathe white. E. Fla. 



2. ARIS2EMA, Mart. DRAGON-ROOT. INDIAN TURNIP. Spathe con- 

 volute at base. Spadix with a long naked summit, flower-bearing at base. 



$ Fls. above the fertile, each merely a cluster of 4 or more stamens. $ 

 Ovary 1-celled, stig. flat. Berry red, 1- or few-seeded. 1C Root tuberous. 

 Scape sheathed with the petioles. 



1 A. trlph^llum Torr. Jack-in-tJie-pulpit. Stem a large corm fiercely acrid ; scapo 



round, thick, 812' ; leaves 2, trifoliate ; leaflets oval, pointed, sessile ; spatho 

 striped, inflected over the club-shaped spadix. Rocky woods. April + . 



2 A. q u iiiatum Wood. Leaves 1 or 2, with very long sheaths, one or both quinate ; 



leaflets oval to lance-oval, acute, or obtuse, cuspidate,^iarrowed to a petiolule. Ga. 

 to Car., in hilly woods. 1 2f. (A. polymorphum Buckley.) 



3 A. Dracoiitium Schott. Green Dragon. Leaf mostly 1, pedate, with 7 11 lance- 



oblong leaflets ; spadix subulate, longer than the spathe. Bogs. 2f. 



3. PELTANDRA, Raf. Spathe convolute. Spadix staminate above, 

 pistillate below. Anth.-cells 8 12, opening at top, adnate to a thickened 

 peltate connectile. Berries 1- GO - seeded. ?{ Leaves sagittate, the long 

 petioles sheathing the scape. May, June. 



1 P. Virginica Raf. Leaves sagittate-hastate, the base lobes long and turned out- 



ward ; epathe green, 46' long ; berries green, 1-3-seeded. Marshes. 9 l^. 



2 P. glauca Feay. Leaves sagittate- cordate, lobes rounded ; spathe white and open 



at the top, 3' ; berries OO-seeded, red. Coastward, S. (Xanthosoma, Sen.) 



4. CALLA, L. Spathe ovate, spreading, white. Spadix covered with 

 the naked fls. Perianth 0. Fil. 6, slender, with 2-celled anthers. Berry 

 red, depressed, 3-6-seeded. if ? Rhizome creeping. Leaves cordate. 



C. palustris L. Shallow waters, Pa., and N. Scape 46'. Leaves 23'. July. 



5. SYMPLOCARPUS, Salisb. SKUNK CABBAGE. Spathe shell-form, 

 thick, close to the ground in early Spring, preceding the leaves, incurved 

 at base and apex. Spadix oval, covered with the dull purple, perfect fls. 

 Perianth 4-parted. Berries 1-seeded. U? Leaves all radical, very large. 

 S. foetidus Salisb. Swamps, meadows : common. Leaves cordate-oval, 12 20 7 . 



6. ORONTIUM, L. GOLDEN CLUB. Spathe 0. Spadix cylindrical, 

 yellow, crowning the naked scape. Perianth 4-6-sepalled. Sta. 46. Fr. 

 a dry utricle, 1-seeded. iixr Leaves lanceolate, all radical. 



O. aqnaticnm L. Pools and brooks. If. Very smooth. Scape thickened upward, 

 green at base, white above, the summit (flowers) golden yellow. June. 



7. AOORUS, L. SWEET FLAG. Spathe 0. Spadix cylindric, sessile, 

 issuing from the side of a leaf-like scape. Perianth 6-sepalled. Sta. 6. Ova 

 wxd fruit 3-celled, capsular, oo-seeded. u Rhizome thick, aromatic. Lvs. 

 aU radical, linear-ensiform like the scape. 



