RYDBERG: STUDIES ON THE Rocky MOUNTAIN FLORA 317 
Ammodenia oblongifolia (T. & G.) Rydb. comb. nov. 
Arenaria peploides major Hook. F\. Bor.-Am. 1: 102. 1831. 
Honckenya oblongifolia T. & G. Fl. N. Am. 1: 176. 1838. 
Arenaria sitchensis Dietr. Syn. Pl. 2: 1565. 1840. 
B. T. Butler has collected in Montana what seems to be Are- 
naria laricifolia L. At least it is the same plant as the one col- 
lected by Turner on the Porcupine River, Alaska, on the strength 
of which A. laricifolia is included in the American flora. 
Sagina occidentalis S. Wats. has been collected in Idaho by 
Leiberg. 
CARYOPHYLLACEAE 
WAHLBERGELLA Fries, Bot. Not. 1843: 143. 1843 
The treatment of the Silenoid genera of this family has been 
very different in this country and in Europe. S. Watson and 
B. L. Robinson admitted only two genera, Silene and Lychnis, 
while Pax* admitted beside Silene the genera Lychnis, Melan- 
dryum, and Viscaria, and Williamst admitted Lychnis, Coronaria, 
Viscaria, Eudianthe, and Melandrium. The only distinction given 
by Watson and Robinson is the number of styles, in Silene 3, 
in Lychnis 5, but Robinson admits that in some species of Szlene 
the styles are sometimes 4 or 5. The number of styles is therefore 
not a very reliable character. Continental authors usually dif- 
ferentiate Silene from Melandrium (by Americans included in 
Lychnis) by the partially septate capsule of the former. According 
to Robinson this character is unreliable in our American species. 
Perhaps the species included in Silene without septum should be 
“moved to Melandrium or to Eudianthe. As these. doubtful 
Species are not found in the Rockies, I shall give no opinion on them 
here. It is evident that the genus Lychnis as treated in America 
‘Ss an unnatural and composite group. Williams’ treatment is 
Perhaps the most logical. Pax included our native American 
Pecies of Lychnis in Melandrium but divided the genus in three 
subgenera. One of these subgenera corresponds to Eudianthe 
~ Only 3 styles. -The other two subgenera correspond to the 
original species of Mf. elandrium and the genus Wahlbergella of Fries, 
* 
Ye & Prantl, Nat. Pflanzenf. 3: 1b: 70, 73- 1889. 
Our. Bot. 31: £70, 171." 1803; 
