244 ARACEAE 
eium of 1 carpel, or of several united carpels. Fruit a pii or a utricle. 
—About 100 genera and 900 species, mostly in tropical regions 
Rooted per plants: pistillate flowers several or many. 
Fl erfect: perianth of several scale-like parts. 
x borne t Jaterally on the leaf-like 
sc ae arsh-plan Tribe I. ACOREAE. 
Spadix terminating the clavate or cylindric fleshy 
quatic plants. Tribe II. ORONTIEAE. 
Flowers monoeciou us or dioecious: perianth wanting. 
Le ds des entire: axis of the spadix completely 
red with flowers Tribe III. PELTANDREAE. 
Leaf- blades 3-many-divided : axis of the spadix 
ved a Tribe IV. AREAE 
Floating uc antis pistillate flower solitary. ribe V. PISTIEAE. 
I. ACOREAE 
s plants e ensiform leaves: E a mere flat prolonga- 
on of the s -1. ACORUS. 
II. ORONTIEAE 
Spadix naked, merely subtended by a deciduous spathe, narrowly 
eonic, yellow. 2. ORONTIUM. 
Spadix surrounded by a fleshy persistent spathe, globular, green. 3. SPATHYEMA. 
TANDR 
III. AE 
Scapose herbs with sagittate or hastate I due spathe green 
or with a white blade. 4. PELTANDRA. 
IV. AREAE 
o ud palmately divided: D convolute below, with a 
dilat Duce ood above: spadix include D. ARISAEMA. 
Leaf-bl ped pedately md spathe eonvolute throughout or 
slightly dilated at the tip: spadix with a long-exserted 
lender tip 6. MURICAUDA. 
/. PISTIEAE 
Floating plants: leaves imbricated on a Short caudex: spadix ad- 
nate to the spathe. 7. PISTIA. 
1. ACORUS L. Herbs with aromatic rootstocks. Leaves with narrowly 
linear blades. Spadix lateral, o ate, at the base of us linear spathe. 
Flowers perfect. Perianth of sige | 
narrow cones members: oe didy- 
cro Two spe- 
cies, one additional to the following in 
Japan. 
A. Calamus L.  Rootstoek horizontal: 
lea 5-20 . tall, aed pli scape 
dieci the 2n spathe erect: spadix 
ong.— : 
FLAG- oon )—Low rounds, meadows, an 
marshes, en provine p Fla. to Tex. 
Ida. On W.)—Spr.- 
sum. — Both plants and habit of growth resemble irises. 
