318 RypBERG: 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. 1: 89. 1830. 
Elisanthe Drummondii Rupr. Fl. Cauc. 1: 200. 1869. 
Lychnis Drummondii S. Wats. Bot. King Exp. 37. 1871. 
‘ Wahlbergella striata Rydb. 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). 1819. 
Melandrium triflorum Vahl, in Liebm. Fl. Dan. 14°: 5. 1843: 
’ Wahlbergella Taylorae (Robinson) Rydb. comb. nov. 
Lychnis Taylorae Robinson, Proc. Am. Acad. 28: 150. 1893. 
WAHLBERGELLA AFFINts (Vahl) Fries, Bot. Not. 1843: 143- 1543 
Lychnis afinis Vahl, in Fries, Nov. Mant. 3: 36. 1842: 
Melandrium affine Vahl, in Liebm. Fl. Dan. 14: 5. 1843: 
' Wahlbergella montana (S. Wats.) Rydb. comb. nov. 
Lychnis montana S. Wats. Proc. Am. Acad. 12: 247. 1877: 
