AR0IDEJ5. (ahum FAMILY.) 815 



ai-y axes, the lower pistillate, the upper stamiaatc. Stamuiatc jloicevs : 

 perigouium consisting of entire of bifid, membranous scales, dispersed 

 among the stamens. Stamens about -3, with short, at length elongated 

 filaments and two-celled anthers. F'lHtillutc Jloicers : consisting of ses- 

 sile, free or twin, 1-celled ovaries each -with a ])erigonium of o pales. 

 Style short, thick, stigma unilateral. Fruit contracted at base, deci- 

 duous with pales, indehiscent, somewhat drupe-like, with a spongy 

 epicarp and a bony endocarp, the seed adherent to shell — Aquatic 

 herbs. 



S. rainosilin, lluds. % .5 to 1 or more; stem erect, branched. 

 Leaves sword-shaped, triquetrous at base. Heads arranged in a leafy 

 l)anicle, sessile or rarely peduncled; pales of perigonium nearly linear, 

 abruptly spathulate toward tip, entire; stigma linear; fruits obpyru- 

 midal, stipitate, beaked — May — Standing water. 



Order CXVI. AROIDE.E. (Arum Familvj. 

 Corinoits 2)l<^^'^'^ts with acrid juice ^ simple or corajjoumL 

 often veined^ leaves, and flowers croioded on a fleshy spadio}, 

 ichich is often surrounded hj a spathe — Flowers usually 

 monoecious and naked, occasionally perfect, and furnislied 

 with a more or less perfect perigonium. Anthers 2-eelled. 

 Ovaries free, 1-8-celled. Fruit indehiscent, (in ours) berry- 

 like. Testa of seed leathery, nsually thick. Embryo straight, 

 in axis of albumen. 



* Leaces entire. 



1. AlilSAItUM. iSpalhe .04 to .05 long, .01 broad. Leaves sagittate, with flowers. 



2. BIARUM. Spathe .OG to .2 long. Leaves linear, oblong or lanceolate, after flowers. 

 o. AEUM. Spathe .1 to .35 long. Leaves sagittate or hastate, before flowers. 



* * Leaves pedatehj dissected. 

 4. IlELICOPHYLLUM. Most of the sterile stamens between tlie two sorts of fertile flowers. 



1. ARISARUM, Targ. Ahisarum. 



Spathe at length caducous, tube long, straight, closed, somewhat 

 contracted at throat, limb curved forward, hood-like. Spadix 

 coalesced at back with lower part of spathe, with U-5, pistillate flowers 

 ou one side, and just above them a loose spike of staminate flowers, 

 ending in a long, stalked, Aliform or clubed-shaped appendage. Pktil- 

 late flowers : ovary immersed in lower part of spadix, 1-celled, x. -ovuled, 

 :.tyle cylindrico-conical, stigma hemispherical, tasseled. 0\iiles 

 attached to the basilar placenta by short funicles, orthotropous, erect. 

 Staminate floioers : flowers monaudrous, short-stalked, anther i")eltately 

 attached, horseshoe-shaped, the two cells dehiscent by a coutiuuou* 

 slit. Berries aggregated. Seeds about G, ovoid, acute, longitudinally 

 wrinkled, borne on an obconical funiclc with a strophiole longer and 

 thicker than funicle — Cormous herbs, with s.igittate loaves appearing 

 with flowers. 



A, vulj;are, Targ. '^. Petioles slender, much longer than 

 blade; blade ovate-cordate to sagittate, .1 long, .08 broad, obtuse or 

 acute, auricles rounded or acute, more or less divergent. Peduncle 

 about as long as petiole, much longer than spathe; spathe cylindrical, 

 .00 to .07 long, white-and-rcd-lined, ending in a purple, ovate to 



