CVII. AKACEiE 
539 
Flowers 1-sexual. 
Spadix prolonged above the flowers. 
Margins of spathe-tube not united. 
Male and female flowers usually on different plants, 
if on the same, the two sexes contiguous . .1. Arisama. 
Male and female flowers always on the same plant, 
the two sexes separated 3. Typhonium. 
Margins of spathe-tube united . . . . .2. Sauromatum. 
Spadix not prolonged above the flowers. 
Spathe-tube ovoid, not constricted, straight . . .4. Remusatia. 
Spathe-tube constricted and abruptly bent at the middle 5. Gonatcmthus. 
Flowers 2-sexual. Spadix not prolonged nor enclosed in the 
spathe. Leaves like those of an Iris . . . .6. Acorus. 
1. ARISiEMA. From the Greek arisamos, conspicuous, dis- 
tinguished. — Temperate and tropical Asia, N. America. 
Erect herbs ; root tuberous, usually globose ; stems sheathed 
at the base by membranous scales. Leaves one or two, digitately 
or pedately compound, base of stalk sheathing. Margins of 
spathe-tube free, overlapping ; limb open, arching over the mouth 
of the tube. Spadix prolonged above the flowers into a short or 
long, usually tail-like appendage, club-shaped in A. flavum. 
Flowers 1-sexual, the male and female usually on different plants, 
if on the same spadix the sexes are contiguous and not separated 
by a barren interval. Male flowers more or less scattered, con- 
sisting of a shortly stalked head of about 3 anthers, except in A. 
flavum where the anthers are sessile and united. Female flowers 
crowded, ovary 1 -celled, ovules usually 2. Neutral organs none, 
or, if present, few, awl-shaped and placed above the flowers of 
either sex. Fruiting spike naked ; berries red, usually 1-seeded. 
The tuberous roots are poisonous in the raw state. 
Leaves digitately compound ; leaflets 3. 
Spathe gradually narrowed into a long, acute point . 1 . A. intermedium. 
Spathe abruptly contracted into a short, tail-like tip . 2. A. Wallichianum. 
Leaves digitately compound ; leaflets 5-7. Spathe grad- 
ually narrowed into a thread-like tail . . . 6. A. Jacqtiemontii. 
Leaves pedately compound. 
Spadix prolonged in a tail-like appendage protruding 
from the spathe. 
Leaflets linear-lanceolate, sessile. Anthers blue or 
purple 3. A. curvatum. 
Leaflets ovate-lanceolate, mostly stalked. Anthers 
white or pale yellow . . . . . . 4. A. helleborifolium. 
Spadix prolonged in a club-like appendage enclosed 
within the spathe 5. A. flavum. 
1. Arissema intermedium, Bl . ; FI. Br. Ind. vi. 500. Stems 
H ft. Leaf usually single, sometimes two, digitately compound ; 
leaflets 3, sessile, ovate, long-pointed, the side ones oblique, 
6-10 x 3^-4 in., the middle one 6-9 x 3-5 in. Spathe green, 
striped with purple and white ; limb gradually narrowed into a long, 
acute point. Spadix prolonged in a very slender, far-protruding, 
