Rydberg: Studies on the Rocky Mountain flora 319 



Wahlbergella Kingii (S. Wats.) Rydb. comb. nov. 

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



Wahlbergella attenuata (Farr) Rydb. comb. nov. 

 Lychnis attenuata Farr, Contr. Bot. Lab. Univ. Pa. 2: 419. 1904. 



Wahlbergella Parryi (S. Wats.) Rydb. comb. nov. 

 Lychnis Parryi S. Wats. Proc. Am. Acad. 12: 248. 1877. 



Wahlbergella apetala (L.) Fries, Summa Veg. Scand. 155. 1845 

 Lychnis apetala L. Sp. PI. 1: 437. 1753. 



Melandryum apetalum Fenzl; in Ledeb. Fl. Ross. 1: 326. 1842. 

 Wahlbergella uniflora Fries, Bot. Not. 1843: 143. 1843. 



RANUNCULACEAE 

 Ranunculus rivularis sp. nov. 

 Ranunculus repens S. Wats. Bot. King Exp. 9. 1871 . 



A perennial with a fascicle of fibrous roots; stem hirsute, pro- 

 ducing long stolons sometimes over 1 m. long, rooting at the 

 nodes and there producing plantlets; leaves ternate, 5-15 cm. 

 wide, divisions petiolate, ovate, usually truncate or subcordate at 

 the base, 3-cleft and coarsely toothed; petals rounded-obovate, 

 about 4 mm. long, scarcely equalling the sepals; head of fruit 

 globose; achenes glabrous, beaks about one third their length. 



The type was determined as R. repens L. by Dr. Watson, but 

 is not so closely related to that species as to R. Macounii Britton. 

 It was probably on account of the creeping and rooting habit 

 that it was referred to the former. The small petals should at a 

 glance have revealed the error, for in R. repens the petals are 

 large and rounded, much exceeding the sepals. R. Macounii is 

 occasionally decumbent but not rooting, and the outline of the 

 leaflets or divisions is different and the beak about one half as 

 long as the body of the achenes. My own specimens from Kimball, 

 Nebraska, had stems over 1 m. long. It grows on wet river 

 banks. 



Nevada: Huntington Valley, August 1868, S. Watson 2/ 

 (type, in herb. Columbia University). 



Arizona: Clark Valley, August 1883, Rusby. 



Nebraska: Kimball, August 12, 1891, Rydberg 7. 



Texas- 1851 Wright 8 sq. 



