318 OKDEU . JO. -AK1CE/E. 



1. PISTIA, L. Spatlie tubular at base, spreading above. Fls. 8 , tew, 

 the upper $ in an involucre, of 3 8 anther-cells. $ Fl. solitary, of a 1- 

 celled ovary and thick style. Berry several-seeded. ? 



P. wpath ulata MX. Floating free in still water ; leaves 12', obovate-spatulate, rosu- 

 late, the veiiis lamellated beneath ; epathe 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, if Root tuberous. 

 Scape sheathed with the petioles. 



1 A. tripliylliim Torr. Jack-ln-the-pulplt. Stem a large corm fiercely acrid ; scapo 



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

 striped, inflected over the club-shaped epadix. Rocky wood*. April + . 



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



leaflets oval to lance-oval, acute, or obtuse, cuspidate, narrowed 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 711 lance- 



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



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

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

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

 petioles sheathing the scape. May, June. 



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



ward ; spathe green, 4 6' long ; berries green, 1-3-seeded. Marshes. 9 18'. 



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



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



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, 8-G-seeded. if tz Rhizome creeping. Leaves cordate. 



. pal ustris L. Shallow waters, Pa., and N. Scape 4 6'. Leaves 2 3'. 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, if T Leaves all radical, very large. 

 S. Jcetidus Salisb. Swamps, meadows : common. Leaves cordate-oval, 12 20'. 



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

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

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



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

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



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

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

 and fruit 3-celled, capsular, co-seeded. U Rhizome thick, aromatic. Lvs. 

 ail radical, linc/ir-ensiform like the scape. 



