63. EUBIACEiE. '85 



10. Ophiorrhiza Linn. 



Sir J. D. Hooker remarks, in Ms " 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 course of my study in the fields, I have found that Hookee's opinion 

 is quite correct. When I was collecting in the Arisan ranges, last spring, J. 

 found two different forms of flowers on two very similar plants. This diver- 

 gence of flowers may be attributed partly, in some cases, to the sexual, 

 and partly, in the other, to the specifical difference. 



Diclwtomous 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 1^ cm. (3) 

 ( 2 ) Plants longer, nearly. 50 cm. long, leaves larger 12 cm. long. 



0. parvijlora and liuhiuensis. 



Plants smaller at most 20. cm. in height, leaves smaller 5 cm. long. 



.... ..... 0. injlata and jMrnila,. 



( 3 ) Stigma-lobes linear. (4). , . 

 Stigma-lobes rounded, (6). 



(4 ) Leaves oblong, lanceolate, usually abruptly acuminate towards the apex, 



attenuate at the base. (5).- 

 Leaves ovate, obtuse or ac ate at- the apex, rounded or abruptly acute 



at the base 0. japonica form, longistigma. 



( 5 ) Leaves pale glaucous beneath in dried specimens. . . 0. dimorphantha 



form, longistigina. 

 Leaves dark greenish above, reddish purple beneath, in dried specimens. 



.0. monticola, form, longistigma, 



( 6 ) Leaves oblong or lanceolate. (7). 



Leaves' linear-lanceolate. 0. stenopJiyUa. 



( 7 ) Leaves quite glabrous or very thinly pubescent. (8). 



