318 ORDER . JO. -AK1CE.E. 



I 



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

 the upper $ in an involucre, of 3 8 anther-cells. 2 Fl. solitary, of a 1- 

 celled ovary and thick style. Berry several-seeded. 7 



P. -4]>jttlni lata MX. Floating free in still water ; leaves 12', obovate-spatulate, rosn- 

 late, the veins lamellated beneath ; spathe 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. U Root tuberous. 



Si-ipe sheathed with the petioles. 



1 A. triphj'llnm Torr. Jack-in-the-pulplt. Stem a large corm fiercely acrid ; scape 

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

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



U A. q H iuatii in 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. Dracontlum 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. 7{ Leaves sagittate, the long 

 IK tioles sheathing the scape. May, June. 



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



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



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, while. Spadix covered with 

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

 red, depressed, 3-6-seeded. 11 zz Rhizome creeping. Leaves cordate. 



C. palustris L. Shallow waters. Pa., and N. Scape 4 6'. Leaves 2 3'. July. 



5. SYMFLOCARPUS, 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. nz? Leaves all radical, very large. 

 S. foetidus Salisb. Swamps, meadows: common. Leaves cordate-oval, 1220'. 



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

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

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



O. aqiiiiticnm 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, Go-seeded, l Rhizome thick, aromatic. Lvs 

 ail radical, liuear-ensiform like the scape. 



