CVII. AEACEu® 
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 
Male and female flowers always on the same plant, 
the two sexes separated . 
Margins of spathe-tube united ..... 
Spadix not prolonged above the flowers. 
Spathe-tube ovoid, not constricted, straight 
Spathe-tube constricted and abruptly bent at the middle 
Flowers 2-sexual. Spadix not prolonged nor enclosed in the 
spathe. Leaves like those of an Iris . ' . 
1. Ariscema. 
3. Typhonium. 
2. Sauromatum. 
4. Remusatia. 
5. Goncitanthus. 
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. fiavum. 
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. 
fiavum 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 . 
Spathe abruptly contracted into a short, tail-like tip 
Leaves digitately compound ; leaflets 5-7. Spathe grad- 
ually narrowed into a thread-like tail . 
Leaves pedately compound. 
Spadix prolonged in a tail-like appendage protruding 
from the spathe. 
Leaflets linear-lanceolate, sessile. Anthers blue or 
purple . ....... 
Leaflets ovate-lanceolate, mostly stalked. Anthers 
white or pale yellow ..... 
Spadix prolonged in a club-like appendage enclosed 
within the spathe ...... 
1. A. intermedium. 
2. A. W allichianum. 
6. A. Jacquemontii. 
3. A. curvatum. 
4. A. helleborifolium. 
5. A. fiavum. 
1. Arisaema intermedium, Bl . ; FI. Br. Ind. vi. 500. Stems 
1| 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, 
