(i6 9 ) 



Moehringia lateriflora (L.) Fenzl. Dawson (Williams); 

 Five-finger Rapids (Tarleton).- 



Merckia fhysodes Fisch. Mouth of Klondike (Williams) ; 

 above Stewart River (Tarleton). 



Arenaria laricifolia L. Dawson (Williams). 



Arena ria triflora (L.) S. Wats. Lebarge Island (Tarleton). 



Arenaria Dawsonensis Britton, sp. nov. 



Glabrous. Stems very slender, several times forked, 1.5-3 

 dm. high. Leaves narrowly linear, smooth, blunt-pointed, 

 the lower 1— 1.5 cm. long, 0.5-1.3 mm. wide, firm, the lowest 

 sometimes with fascicles of smaller ones in their axils, the 

 uppermost reduced to bracts ; lower internodes 4-6 cm. long ; 

 pedicels filiform, divergent-ascending, straight ; sepals oblong- 

 lanceolate, acute, strongly 3-nerved, 4 mm. long, 1-1.5 mm. 

 wide, the calyx impressed at the base ; petals oblong, a little 

 shorter than the sepals or equalling them; pod narrowly 

 ovoid, membranous, 3-valved, a little longer than the sepals : 

 seeds oval-oblong, reddish brown, 0.6-0.7 mm. long, rough- 

 ened with low irregular ridges. 



Dawson, R. S. Williams, July 16, 1899. 



Apparently nearest to A. Michauocii (Fenzl.) Hook., but 

 with short petals, merely acute sepals and much longer inter- 

 nodes. 



Family Ranunculaceae. 



Actaea arguta Nutt. Five-finger Rapids (Tarleton). 



Anemone Richardsoni Hook. Near mouth of Bonanza 

 (Williams) ; near Selwyn River (Tarleton). 



Anemone farviflora Michx. Dawson (Williams) ; White 

 Horse Rapids and Lake Bennett (Tarleton). 



Anemone globosa Nutt. Lake Lebarge and White Horse 

 Rapids (Tarleton). 



Pulsatilla hirsutissima (Pursh) Britton. Near Hootalinqua 

 (Williams) ; Lake Bennett and Lake Lebarge (Tarleton). 



Ranunculus Yukonensis Britton, sp. nov. 



Group of R. Purshii. Stems almost filiform, 1 dm. long 

 or less, sparingly pubescent toward the end. Leaves slender- 

 petioled, 6-14 mm. wide, dissected into linear, entire or 



