14 S. KIKKAWA: 
The Classification of Rice with regard to its 
Cultivation. 
(1) Common or aquatic rice and upland rice. 
This is the classification according to quantity of water required and 
is very familiarly known to farmers in rice-growing countries. Some: 
kinds of upland rice may be descendants of true upland species, such as 
Oryza granulata, Nees (Figs. 1, 2 and 5) and Oryza latifolia, Desv. (Figs. 
3 and 11), which according to Sir GEORGE Warr are still found in moun- 
tainous districts of India. They have perennial woody root stocks and 
leaves without air-chambers; but all the upland rices, so far as the writer 
knows them, cultivated in the chief rice-growing countries, have no spe- 
cialities in morphological and histological characters. Sir Grorcr Warr 
places all upland cultivated rice under his variety abuensis and does not 
regard these as in any material way derived from O. granulata but con- 
siders O. latifolia, Desv. (=O. officinalis, Wall.) almost intermediate 
between O. granulata and O. sativa, from the standard of botanical strue- 
ture. If, therefore, hybridization has contributed toward the production 
of any of the forms of the less aquatic rices, then he believes attention 
should be first directed to O. latifolia. 
Its remarkable inflorescence, forming umbellate divisions, borne on 
long naked peduncles, are characters frequently met with in certain cul- 
tivated rices. But the variety abuensis (based on a wild rice found by I. F. 
Durute on Mount Abu in Rajaputana) might quite well have originated 
all the races of cultivated upland rices without calling in the aid of either 
O. granulata or O. latifolia just as O. coarctata, Grif., (Figs. 4, 7, 8, 9 
and 10), the wild rice of the Indus valley, of the lower Gangatie valley’ 
and of certain of the river basins of Burma, is quite unconnected with 
the aquatic cultivated rice.! 
The writer has often experienced in several districts of Japan that 
some of the so called upland rices grow better and produce more in flooded: 
1. Sir GEORGE WAtTT?’s opinion, directly told to the writer. 
