318 Rydberg: Studies on the Rocky Mountain flora 



respectively. The typical species of Lychnis have 5-valved capsules 

 with entire valves. In the typical species of Melandrium the 

 valves are 2-cleft at the apex. In Wahlbergella the valves are also 

 more or less notched. In that respect the species belong rather to 

 Melandrium than to Lychnis. But the typical species of Melan- 

 drium are dioecious plants with ample long-exserted petals and of a 

 different habit from that of our native species. These all have 

 hermaphrodite flowers with very small and inconspicuous or even 

 no petals. In my opinion the genus Wahlbergella should be taken 

 up for our native species usually included in Lychnis. Lychnis 

 Drummondii (Hook.) S. Wats, is somewhat different in habit and 

 fruit and was referred to Elisanthe by Ruprecht, but I think 

 it can well be included in Wahlbergella. Of course L. striata Rydb. 

 is closely related to it and should be referred to the same genus, 

 whatever disposition of it is made. The species of Wahlbergella 

 in America are as follows: 



Wahlbergella Drummondii (Hook.) Rydb. comb. nov. 

 Silene Drummondii Hook. Fl. Bor.-Am. i: 89. 1830. 

 Elisanthe Drummondii Rupr. Fl. Cauc. i: 200. 1869. 

 Lychnis Drummondii S. Wats. Bot. King Exp. 37. 1871. 



Wahlbergella striata R\'db. comb. nov. 

 Lychnis striata Rydb. Bull. Torrey Club. 31: 408. 1904. 



Wahlbergella triflora (Vahl) Fries, Summa Veg. Scand. 155. 



1845 

 Lychnis triflora R. Br. Ross. Voy. App. CXLII (hyponym). 18 19. 

 Melandrium trifloruni Vahl, in Liebni. Fl. Dan. 14"': 5. 1843. 



Wahlbergella Taylorae (Robinson) Rydb. comb. nov. 

 Lychnis Taylorae Robinson, Proc. Am. Acad. 28: 150. 1893. 



Wahlbergella affinis (Vahl) Fries, Bot. Not. 1843: 143. 1843 

 Lychnis affinis Vahl, in Fries, Nov. Mant. 3: 36. 1842. 

 Melandrium affine Vahl, in Liebm. Fl. Dan. 14"*": 5. 1843. 



Wahlbergella montana (S. Wats.) R\ db. comb. nov. 

 Lychnis montana S. Wats. Proc. Am. Acad. 12: 247. 1877. 



