382 MR. F. X. WILLIAMS OX THE GENUS DIANTRL'S. 



tetragoni. Folia lanceolata acuta plana 5-nervia; radicalia 

 44 mm., vagina folii diam. duplo longiore, caulina 30 mm., 

 vagina folii diam. sequante, subfloralia lanceolato-linearia. Inflo- 

 rescentia fastigiis faaciculorum regulariter trichotomorum, floribus 

 densis brevissime pedicellatis inodoris. Bracteae 4 lanceolate 

 acuminate ad calycis apices. Calyx viridis v. rubescens apice 

 attenuato, dentibus acuminatis. Petala contigua ; lamina =^ 

 unguis. Capsula oblonga. Semina granulata. 



b. latifolius, Ser. in DC. Prodr. i. p. 356 ; auct. Pinks Cent. 

 Eur. p. 21. 



Folia latiora. Inflorescentia fasciculis simpliciter trichotomis. 



c. aggregatus, Poir. Encyc, Supplem. iv. p. 124 ; Ser* in DC. 



Prodr. i. p. 356 ; Sweet, Fl. Gard. ii. t. 166. 



Asperiusculus. Flores capitulis aggregate. Bractese calyeem 

 superantes. 



d. rariflorus, Schur, Enum. PI. Transsilvanicp, p. 92 ; auct. 

 Pinks Cent. Eur. p. 21. 



Flores non dense aggregati. Bractese breviores. Petala pallida 

 rosea. 



Geogr. limits'. 



N. Moscow (prov.), 55°. E. China, 120°. 



o 



S. K China, 35°. W. Republic of Andorra, 2 



Rohrbach sinks in this species Thunberg's D. japonicus (?ee 

 no. 2S) ; but D. barbatus differs from it in the following points : 

 Stems 4-angular, and sometimes branched above ; leaves lanceo- 

 late, plane, and not contorted at the base, 5-nerved ; sheath of 

 the radical leaves twice as long as broad ; fascicles fastigiate ; 

 flowers of a darker red, denser, and consequently on shorter 

 pedicels ; bracts very scarious, lanceolate, as long as the calyx ; 

 calyx contracted at the base of the purple teeth ; petals broader, 

 obovate-cuneate ; and capsule oblong, — so that they seem as dif- 

 ferent as any two pinks can well be. An experiment of Darwin's 

 further illustrates the distinction. In his investigations into the 

 power of mutual cross-fertilization of the commoner pinks, he 

 found that if the flower of D. barbatus were fertilized by the pollen 

 of D. superbus it yielded a proportional 81 seeds, when fertilized 

 by the pollen of D. japonicus a proportional 66 seeds, relatively 

 to the 100 seeds produced by its own pollen. There seems a 

 discrepancy in various descriptions of the species as to whether 

 the petals are bearded or not. 1 have followed Eeicheubach 



