63. RUBIACERX. 85 
10. Ophiorrhiza Yasw. 
Sir J. D. HookER remarks, iu his ** Fl. Brit. Ind. HI. p. 77," that the 
characters taken from the position of the stamens on the corolla-tube, the 
hairiness within of the latter, the length and smoothness or hairiness of the 
style, and the form of the stigma are probably sexual to a very great degree. 
In the eourse of my study in the fields, I have found that Hooxrm's opinion 
is quite correct. When I was collecting in the Arisan ranges, last spring, I 
found two different forms of flowers on two very similar plants. — "This diver- 
gence of flowers may be attributed partly, in some eases, to the sexual, 
and partly, in the other, to the specifical difference. 
JDichotomous Key to the Species. 
(1) Bracteoles 0, flowers very much smaller, less than. 5 mm. in. length. (2) 
Bracteoles conspicuous or small, flowers. larger, longer than 1j em. (3) 
(2) Plants longer, nearly 50 em. long, leaves larger 12 em. long. 
JU T O. parviflora and. liukiuensis. 
Plants smaller at most 20 em. in height, leaves smaller 5 em. long. 
Luise TI O. inflata: amd. punila. 
(3) Stigma-lobes linear. (4). 
Stigma-lobes rounded. (6). 
(4) Leaves oblong, lanceolate, usually abruptly aeuminate towards the apex, 
attenuate at the base. (5). 
Leaves ovate, obtuse or aeute at the apex, rounded or abruptly acute 
atWthesbases qw eMe i erst O. jeponica form. longistiqma. 
(5) Leaves pale glaucous beneath in dried specimens... O. dimorphanthe 
form. longistignut. 
Leaves dark greenish above, reddish purple beneath, in dried specimens. 
. O. monticola, form. longistigma. 
(6) Leaves oblong or lanceolate. (7). 
lienves Imnear-lanceolate. 3 :..... 20. 2L AER ete ene O. stenophylla. 
(7) Leaves quite glabrous or very thinly pubeseent. (8). 
