318 TRANSACTIONS OF THE [Sess. lxxix. 



glabrous and there is a general want of long articulated 

 hairs upon the plant. Occasionally there may be an 

 indication of these long hairs, particularly at the base of 

 the umbels and of the calyx. The Assam plants are larger 

 and they have more prominently all over long articulated 

 hairs. On the under surface of the leaf of the lamina 

 these hairs occur on the veins, and they are particularly 

 prominent below the umbels and at the base of the calyx 

 where they form quite a beard. These differences, however, 

 are not sufficiently prominent to warrant a real diagnosis 

 of forms, and as the Naga Hills may be looked upon as a 

 northern extension of the Manipur highlands, the isolated 

 specimens from the two localities which I have had under 

 examination may be treated for the present as only slight 

 variants within a limited area of one form of P. Listeri, 

 King, leaving it to future exploration to determine whether 

 there is actual segregation of the forms in nature. The 

 combined form is, however, I think, deserving of a dis- 

 tinctive name in this series, and its distribution over an 

 area so far south-east of Sikkim — the home of the type 

 P. Listeri, King — suggests the name P. austrolisteri, Balf. 

 til., for the microform. 



The physiognomic imprint of P. Listeri, King, and 

 P. austrolisteri, Balf. fil., is distinct from that of 

 P. obconica, Hance. The assemblage of characters in 

 foliage, inflorescence, and flower suffices to establish them 

 as a central form of which doubtless many modifications 

 have yet to be discovered. 



I now refer to the plant known as 



P.filipes, Watt. (Plate XXXI) 



Sir Joseph Hooker 1 was doubtful of the distinctness of 

 P.filipes, Watt, from P. Listeri, King, "having only very 

 imperfect specimens of this last." I also am in some 

 difficulty, not because of want of specimens of P. Listeri, 

 King, but because of the imperfection of material of 

 P. filipes, Watt. I have seen enough, however, to enable 

 me to say with certainty that type P. Listeri, King, is 



1 Hook. f. in Fl. Brit. Ind., iii (1882), 485. 



