216 
by the amount of nutrition which a plant obtains from soil. It 
sometimes happens that a particularly well developed specimen of a 
dioecious species may become monoecious, and I have observed such 
a case in A. Thunbergii and in A. heterophylla. With regard to 
these interesting phenomena, further observations and experiments 
are very much to be desired. : 
A. serratum grows in Central and South-Western Japan, while 
A. japonicum is widely distributed nearly all over the country and 
also even in China, Corea and in Manchuria. Where these two 
species occur together, hybridisation seems to take place between 
them. One sometimes comes across an intermediate form about 
which it is by no means easy to decide from herbarium material. 
In conclusion I may perhaps mention here the nomenclature and 
also the specimens represented in the Kew Herbarium. 
Arisaema japonicum— Blume, in Rumphia, i, 106 (1835). A. 
amplissimum, Bl. ; Mig. Prol., p.134. A. latisectum, Bl. ; Migq., l.c. 
A, japonicum var. angustifoliolata, Miq., l.c., p. 375. A. japonicum 
var. latisectum, Miq., l.c. A. japonicum var. latifoliolata, Schott. 
A, serratum forma Blumei, Makino, in Tékyé Bot. Mag., 1901, 
p- 129, partim. A. angustatum, Fr, et Sav. Enum. Pl. Japon., ii, 
pp. 3, 507. 
Japan, Without definite locality, ex Herb. Lugduno-Batav., 
J, Small, 1853; Nagasaki, Maximowicz, 1863,* Oldham, n. 818 ; 
mountains, Maries. 
Hina. Hupeh, Henry, 5371; Tientai Mt., prov. Chekiang, 
Faber, 1889. Kew, cult., type of Bot. Mag., 610-2130 m., 7916. 
_ SAPAN. 
Musashi, Watanabe, 1895. 
There is a specimen at Kew collected by Maximowicz at 
spathe is very large and deep purple in colour. 
Both Arisaema japonicum and A. Tahkedai produce bulbils on the 
corm, while, so far as I am aware, they are absent in A. serratum. 
e, herbarium specimens do not show this point, so that, 
at present, I am unable to be precise about this character. 
eee er ee ee 
* Makino, in Tékyd Bot. Mag., xxiv, p. 73. 
