404 AUACK.K. (auim I amii.y.) 



1. C. nucifera, I^. (Cocoa.) Stem 40° -60° high; leaves very long, the 

 divisions narrow 1\ lunceolato ; spatlie deejih' grooved ; spadix long, hranch- 

 iiig ; nut vcrv large, ovale. — South Florida. Introduced. 



Okiiku 1;37. AKACE-^. (Aklm Fa.milv.) 



Cliiefly acrid steiuless herbs, iroiii tubeious ur creeping rootstocks, 

 with entire or divided oi'teii veiny leaves, and jieriect or monoecious 

 flowers borne on a spadix, and commonly enclosed in a spathe. — 

 Calyx and corolla wanting, or the former with scale-like sepals. 

 Stamens short, hypogynous : anthers extror.se, commonly sunk in the 

 thick connective. Ovary 1 -several-celled, with 1- several ovules 

 in each cell. Stigma se.ssile. Fruit fleshy, indehiscent. Embryo 

 straight. Albumen mealy or fleshy, sometimes wanting. 



Synopsis. 



• C.ilyx and corolLa none. Spadix enclosed In a Bpathe. Flowers monoecious. 

 ■>- Fertile flowers numerous. Spadix free. 



1. ARISi;M.\. Spadix barren above. Leaves 3 - Beveral-lobed. 



2. PELTANDRA. Spadix flowering throughout. Leaves sagittate. 



<- -^ Fertile flowers solitarj*. Spadix aduate to the spathe. 



3. PISTIA. Free-floating aquatics. Fertile flowers solitarj-. 



* • Calyx manifest. Flowers perfect. 

 <- Spadix enclosed in a spathe. 



4. STMPLOCARPUS. Spatho thick and fleshy, convolute, pointed. Spadix globular. 



Sepals and stamens 4. 



•«- ♦- Spadix naked. 



5. OROXTIUM. Spadix terminating the club-sh'.pal w^iito-topped scape. 



6. ACORUS. Spadix attached to the side of the flattened Isaf-like scape. 



1. ARISiEMA, Mart. Indian- Tcrxip. 



Spathe convolute below, dilated and commonly arched above, withering. 

 Spadi.x covered below with monoecious or dioecious flowers (the lower ones 

 fertile), elongated and naked above. Caly.x and corolla none. Stamens 4 in 

 a whorl, very short: anther cells 2-4, distinct, opening at the top. Ovary 

 1-celled, with 5-6 erect orthotropous ovules. Stigma sessile. Fruit a 1 - 

 few-seeded scarlet berry. Embryo in the axis of mealy albumen. — Root 

 tuberous. Petioles of the commonly divided and veiny leaves elongated and 

 sheathing the scape. Fruit clu.sters naked. 



1. A. triphyllum, Torr. (Wake-'Robin.) Leaves two, trifoliate; 

 leaflets sessile, oblong-ovate, acuminate; spathe tubular, dilated, and incurved 

 above, acuminate, green, or variegated with white and purple, longer than the 

 club-shaped obtuse often dioecious spadix. — Low rich woods. !March. — 

 Plant lo - H° high. Leaflets 3' - 6' long. Root depressed, rugose, intensely 

 acrid. 



2.' A. quinatum. Leaves single and 3-foliate, or two, and the lower 

 one 3-foliate, the other subquiuate ; leaflets elliptical, acute; spathe acute; 



