FORMS AND DISTRIBUTION OF BATRACHIUM. 



45 



petal. After being placed in this manner it appeared that the species 

 numbered 1-5 in the fifth edition of Babington's ' Manual of British 

 Botany ' lay in a straight line whose equation was x — 4< 1/ + 11 = 0, 

 that those numbered 6-8 lay in a parallel straight line whose equation 

 was X — 43^ + 6 = 0, and that the remaining four, 9-12, lay in a third 

 straight line, whose equation was x — y = 4. 



The accompanying figure was contained in the above-mentioned 

 paper. The unit of length is three-twentieths of an inch. 



Eefeeences. 



I. R. trichoplti/llus ^ 

 (13,6). 

 II. R. Drouetii (9, 5) 



III. R. heterophyllus 



(25,9). 



IV. B. con/usus (21, 



8). 

 V. R. Baudotii (17, 



7). 

 VI. R.Jloribundus 

 (26, 8). 

 VII. R. peltatm (30, 

 9). 

 VIII. n. tnpartitus, (0, 

 3). 

 IX. R. circinatus (I", 

 11). 

 X. R. flidtans, (18, 

 U). ) 



XI. R. ccenostis (9, 5). 

 XII. R. hederaceus (7, 1 

 8). J 



The names follow the 

 fifth edition of Babing- 

 ton's • Manual of British 

 Botany.' 



Axis of veins of petals. 



In the same paper it was noticed that while in E. confusus, Godr., the 

 flowering peduncles are nearly straight, and the stamens are longer than 

 the head of carpels ; in the allied R. Baudotii, Godr., the stamens are 

 shorter than the head of carpels, and the peduncles are much and firmly 

 arched. Thus a provision appears to be made to enable the pollen in 

 eacb case easily to reach the stigmas and fertilization to take place. 



