215 : 
there exist certain other characters, by which we can distinguish 
two different plants. Owing to the encouragement I have received 
from Mr. T. Makino, I continued my investigations and came to 
the conclusion, that A. serratum and A. japonicum must be regarded 
as two distinct species. Recently I was able to examine a number 
of specimens preserved in the Kew Herbarium, some of which have 
been referred to by the previous workers. The result of this 
comparison agreed very well with that of my former study, and 
seems to me not to be superfluous to publish here. The principal 
points by which we can distinguish these two species are as follows :— 
The central one of the pedately-arranged leaflets : 
more or less long-stalke 3 ... A, japonicum 
generally sessile or shortly stalked ... A. serratum 
The elongate appendage of the spadix : 
slender and sometimes more or less atten- 
uated towards the apex and slightly 
curve ess = ow ... A, japonicum 
stout, clavate, more or less thickened at 
pex - wee sve .. A, serratum 
The tubular part of the spathe : 
cylindrical, slightly recurved at the 
mouth, generally longer than the 
lamina Ri =r ae ... A, japonicum 
infundibuliform, much recurved at th 
mouth, generally equal in length to 
the lamina... ie iggy .. A, serratum 
The characteristics represented by the flower are well marked in 
living specimens, but are rather obliterated by pressing them. 
The colour of the flower and of the patches on the stem is but little 
reliable, since there often occurs an intermediate condition, and also 
it shows a certain degree of modification every year. The serration 
on the leaf-margin does not afford a character distinguishing for 
species or varieties in many species of Arisaema. As in these two 
plants, Engler regards the serration as a principal character distin- 
guishing A. Sazensoo from A. amurense.* In nature these plants 
was ; and in general, the male plant is smaller than the female, It 
appears to me, that the question of sex in this genus is determin 
* Engl., Le., p. 550. 
