4G8 ME. F. N. WILLIAMS OS THE GENUS DIAKTHTJS. 



Species Candolleanje. 



In the ' Prodromus,' vol. i. pp. 355-365, De Candolle enume- 

 rates 113 species. It will be interesting to scrutinize this list 

 with the view of comparing the number of good species with those 

 which are at present known and recognized. Of the 113 there 

 given, 66 are maintained as species in the present monograph ; 

 the other 47 are to be accounted for by a process of elimination. 

 Of these, thirteen cannot be identified at all ; they include : 

 D. armerioides, Hafin., clavatus, Desf., grandiflorus, Poir., 

 Hornemanntj Ser., rnarginatus, Poir., pomeridianus, Linn., 

 pumilus, Vahl, punctatus, Spreng., pungens, Linn., silenoides, 

 Poir., Sternbergii, Schleich., suavis, Willd., and virgineus, 

 Linn . 



One is a garden form, 



D. latifoliiiSj "Willd. 

 One is a hybrid, 



JD. saxatilis, Pers. ( = coIlinus-fmonspessulanus). 

 Two species are to be referred to other genera ; they are : 



D. carolinianus, Walt. = Dodecatheon Meadia, Linn. 



D. spinosus, Desf. = Acanthophyllum spinosum, C. A. Meg. 

 Seven are absorbed in D. sinensis, viz. : 



D. alpestris, Balb. ; asper, Willd. ; caucaseus, Sims ; 

 Fisclieri, Spreng. ; ibericus, Willd. ; montanus, Bieb. ; 

 ruthenicus, Roem. 

 Six names are sunk, as being synonyms of other species, viz.: 



Burchellii, Ser. = crenatus, Thunb. 



cephalotes, Ser. = capitatus, Balb. 



divaricatus, Urv.=tripunctatus, S. et S. 



Mussini, Hornem. = squarrosus, Bieb. ? 



purpureus, Lam.=pungens, Gren. et Godr. ? 



svffruticosa, "Willd. = Bisignani, Ten.? 



The remaining 17 species enumerated are reduced to the rank 

 of varieties, and are as follows : 



aggregatus, Poir.=barbatus, var. aggregatus. 



Balbisii, Ser. = Carthusianorum, var. glaucophyllus, 



Wierzb. 

 bicolor, Bieb., rnonadelphus, Vent., ocJiroleucus, Fisch., et 



pollens, Sibth. & Sm. = cinnamomeus, var. glaber. 

 bi/lorus, Sibth. & Sm. = cinnabarinus, var. alpinus, Boiss. 



