668 Oeder 131.— AKACa<E. 



GENEBA. 



{ 8padix enveloped in a spathe. (*) ' 



• Flowers covering only the base of the spadix. Perianth Arisama. 1 



• Flowers covering the whole spadix, and (a) 



a Monoscious. Perianth 0. Berry 1 -seeded. Bpathe coBTolate Peltasdba. 2 



a Monoecious. Per. 0. Berry 8 to 6-5eeded. Spathe large, revolute, white. Bioiiardia. 8 



a Perfect. — Perianth 0. Spathe open, white Calla. 4 



—Perianth regular. Spathe shell-form, purplish Simplocarpu8. 6 



g Spadix naked, having no spathe, — terminal, yellow Oro.vtium. 6 



— lateral ; scape loaf-like AeoEus. 7 



1. ARIS^^fflA, Martins. Dragon-root. Indian Turnip, {apov, 

 arum, C7r;|iia, a sign.) Spathe convolute at base, limb arched or some- 

 what plain ; spadix covered with flowers below, naked and elongated 

 above ; flowers diclinous, achlamydeous ; 3 above the fertile, each flower 

 consisting of 4 or more stamens with anthers opening at top ; $ ovary 

 1-celled; stigmas depressed; ovules 2 to 6, orthotropous, erect from the 

 base of the cell; berry red, 1 or few-seeded. — 1i Scape arising from a 

 a corm or tuberous rhizome, sheathed with petioles of the radical, 

 veiny Ivs. (Arum, L.) 



1 A. triphyllum L. Jack-in-the-pulpit. Acaulescent; Ivs. trifoliate, mostly 

 in pairs, leaflets oval, acuminate ; spadix clavate, obtuse; spathe ovate, acuminate, 

 flat and inflected above. — A curious and well known inhabitant of wet woodlands, 

 Can. to Ga. W. to the Miss. The stem is a rugous, fleshy, subterraneous corm 

 giving off radicles in a circle from tlie edge. Scape 8 — 12' high, erect, round, 

 embraced at the base by the long sheaths of the petioles. Leaflets, 2 — 1' long, 

 J' as wide. Spathe green without, usually variegated within with stripes of dark 

 purple alternating with pale green. Spadix much shorter than the spathe, vary- 

 ing from green to dark purple. Fruit a bunch of bright scarlet berries. The 

 corm loses its fiercely acrid principle by drying, and is then valued as a carmina- 

 tive, &c. Apr., Jn. (Arum, atrorubens Ait.) 



2 A. quinatum. Acaulescent ; Ivs. with very long sheaths, in pairs one or both 

 quinate; Ifts. oval-lanceolate, acuminate, narrowed at base to a short petiole or 

 sessile ; spadix long and slender, nearly inclosed in the ovate-lanceolate spathe, 

 which is briefly inflected at the pointed apex ; berry 1 to 2-seeded. — Ga. and S. 

 Car. (Curtis.) Scape 1 to 2f high. Lvs. with long petioles and still longer sheatha 

 Lfts. 5 to 10' long, spathe 3 to 5' (Arum quinatum Nutt.) — Perhaps identical with 

 A pentaphyllum (Sohott.) of India. 



/3. OBTDSO-QUXNATUM. Lfls. rounded-obtuse, mucronate, abruptly narrowed to 

 a long petiolule. — Georgia ^eay, Pond). 



3 A. Draoontium S<::hott. Geeen Deagok. Acaulescent; If mostly solitary, 

 pedate; lfts. 7 to 11, oblong-lanceolate; spadix subulate, longer than the convo- 

 lute, oblong spathe. — Less common in N. Eng. than the former species, found in 

 wet places, banks of streams, U. S. Stem a fleshy, subterraneous corm. Scs^ 

 slender, 10' to 2f high. Ijeaf on an erect, sheathing pCtiole, which is diohotomous 

 above, each half bearing 2 — i leaflets with an odd one at the fork. Leaflets 5 to 

 8' long, one-third as wide. Spathe green, 1 — 2' long, rolled into a tube at bas& 

 Spadix slender, with its long, tapering point much exsertod. Fruit a bunch of 

 red berries. Jn., Jl. (Arum Dracontium 1.) 



2. PELT'ANDRA, Eaf. (Gr. nsXrr], a shield or target, dvSpeg.) 

 Spathe convolute ; spadix covered with flowers, staminate above, pistil- 

 late below ; perianth ; anthers 8 to 12, attached to the margin of a 

 peltate, oblong, connectile, and opening by a terminal pore; berry 1- 

 celled, 1 to 3-sceded. — 2f Kt. fibrous. Lvs. sagittate. 



1 p. Virginica Eaf. Acaulescent; lvs. oblong, hastate-sagittate, acute at apex, 

 the lobes obtuse; spathe elongated, incurved, green, wavy on the Tnargin; spadix 

 covered with staminate flowers the greater part of its length. — A smooth, dark 

 green plant, in wet grounds, Jf. T. and Ms. to Car. Leaves radical, numerous, 



