434 93. AEACE.E. 



definite. Antli. turned outwards. Ovary free, with 1 or more 

 cells. Stigma sessile. Fr. succulent. Embryo slit on one side. 

 Arum has abundant raphides, Acorus none. 



Tribe I. ORONTEJE. Spath like a continuation of stem. Fl. 

 perfect. 



1. ACORUS. Fl. on a sessile spadix, appearing lateral. Peri- 

 anth 6-leaved, inferior, persistent. Starn. 6 ; filiform. 



Tr. II. AREsE. Spath convolute at the base. Fl. monoecious. 

 Perianth 0. 



2. ARUM. Perianth 0. Male fl. of 1 sessile 2-celled anther. 

 Fern. fl. placed lower, of ] pistil. Top of spadix naked. 



1. AC'ORUS Linn. Sweet Flag. 



1. A. Calamus (L.) ; st. with a long leaflike prolongation 

 (or spath) beyond the spadix. E. B. 356. R. x. 429. St. 5 

 6 feet high, resembling the 1., swordshaped, flattened. Spadix 

 completely covered by the flowers, 2 3 in. long, lateral. St. 

 and 1. sweet-scented when crushed. In water, rare ; except in 

 Norf. and Suff. ^Between Lisburn and Moira, Co. Down. P. 

 VI. VII. E. I. 



2. A'KTJM Linn. Cuckoo-pint. 



1. A. maculdtum (L.) ; /. vernal all radical hastate-sagittate 

 with deflexed lobes, petiole as long as leaf-limb, spadix club- 

 shaped straight falling short of the spath. E. B. 1298. R. vii. 

 8. ---Root tuberous. L. with branching veins, green or spotted 

 with purple. Spath ventricose below and above, constricted in 

 the middle, with inflexed edges when open. Spadix usually 

 purple blunt ; with ovaries at the base ; above them whorls of 

 stamens ; then a few filaments, probably abortive pistils ; club 

 naked. Berries scarlet, remaining after the rest of the plant has 

 disappeared ; seeds mostly 4 or 3. or rarely 2. Hedge-banks 

 and thickets. P. IV. V. E. S. I. 



2. ^.tto/'tt?eim(Mill.); /. appearing before the ivinter all radical 

 triangular-hastate with divaricate lobes, petiole longer than leaf- 

 limb, spadix clubshaped straight falling snort of the widely spread 

 spath. R. vii. 11. L. dark blue-green, sometimes with yellowish 

 veins, rarely spotted, blunt. Spath ventricose below, opening 

 nearly flat and very broad above, folding down in front when fl. 

 are in perfection so as to close the opening like a flap, ultimately 



