440 AEACE^. (arum family.) 



gated and naked above. Calyx 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. — Boot tuberous. Petioles of the com- 

 monly divided and veiuy leaves elongated and sheathing the scape. Fruit-clus- 

 ters naked. 



1. A. triphyllum, Ton-. CWake-Robin.) Leaves two, trifoliate ; leaf, 

 lets sessile, oblong-ovate, acuminate ; spathe tubular, dilated, flattened and 

 incurved above, acuminate, green, or variegated with white and purple, longer 

 than the club-shaped obtuse often dioecious spadix. (Arum triphyllum, i.) — 

 Low rich woods, Florida, and northward. March. — Plant 1° - 1^° high. Leaf- 

 lets 3' - 6' long. Root depressed, rugose, intensely acrid. 



2. A. polymorphuni. Loaf solitary, 3 - .'5 foliolate ; leaflets varying 

 from oblong to obovate, acute or slightly acuminate, nearly sessile, the lateral 

 ones entire, 2-lobcd or 2-parted to the base ; spathe, &c. as in the preceding. 

 (Arum polymorphum, Buckley. A. quinatum, Nutt. ?) — Mountains of North 

 Carolina. — Plant 1° - 1 J° high. 



3. A. Dracontium, Schott. (Dkagon-eoot.) Leaf solitary, pedately 

 9 - 13-foliolato; leaflets petiolcd, entire, lanceolate or oblong, acuminate ; spathe 

 tubular (green), concave and erect above, much shorter than the very slender 

 spadix. (Arum Dracontium, L.) — Rich woods, Florida, and northward. 

 March and April. — Plant 1 ° - 1 ^° high. Berries numerous on the flat rhachis, 

 1 - 3-seeded. 



2. PEIiTANDBA, Raf. Akrow-Akum. 



Spathe elongated, fleshy, convolute throughout, wavy on the margins, curved 

 at the apex, persistent at the base. Spadix long, wholly covered by the mo- 

 noecious flowers. Calyx and corolla none. Anther-cells 5-6, imbedded in the 

 thick peltate connective, opening by a terminal pore. Ovary 1-celled, with sev- 

 eral orthotropous ovules. Berry 1 - 3-seeded. Seed gelatinous, without albu- 

 men. Embryo large. Plumule conspicuous, curved. — A fleshy stemless marsh 

 herb, from a creeping rhizoma. Leaves sagittate, with the petiole sheathing the 

 base of the thick scape. Fruit-elusters enclosed in the fleshy persistent base of 

 the spathe. 



1. P. Virginica, Raf. Leaves several, oblong, acute, finely veined, and 

 with 2-3 intramarginal neiwes, the lobes obtuse ; scapes shorter than the leaves 

 recurved in fruit ; spathe lanceolate, acute, longer than the cylindrical spadix, 

 both early decaying above the fertile flowers ; berries green, in a globose cluster, 

 1-seeded. (Arum Virginicum, £.) — Marshes and wet places, Florida, and 

 northward. April and May. — Plant 1° high. Spatbes 2'- 4' long. 



3. XANTHOSOMA, Schott. 



Spathe convolute at the ba.'e, straight. Spadix sterile in the middle. Calyx 

 and corolla none. Anther-cells numerous, adnate to the conical truncate 



