RYDBERG : STUDIES ON THE Rocky MOUNTAIN FLORA 23 
The Rocky Mountain specimens agree in this respect with L. 
virosa. They have also the obtuse lower leaves of that species 
as figured by Morison, as illustrated in Sweet’s English Botany, 
in Baxter’s British Phaenogamous Botany, and in the Flora von 
Deutschland. Allioni’s illustration of ZL. augustana shows only 
the upper part of the plant, but all the leaves shown are decidedly 
acute. 
Lactuca polyphylla sp. nov. 
Biennial; stem stout, about 1 m. high, glabrous; leaves sessile 
and slightly auriculate-clasping, very numerous, linear-lanceolate, 
entire, acuminate, 1-2 dm. long, glabrous, not at all spinulose; 
panicle conical, much branched, about 3 dm. long, 1.5 dm. broad; 
involucres about 1 cm. high; outer bracts lanceolate, about half 
as long as the linear-lanceolate inner ones; achenes nearly black, 
3-4 mm. long, oval, indistinctly 3-nerved, transversely rugose; 
beak about 2 mm. long. 
The type was determined as Lactuca integrifolia Bigel., but 
it differs from that purely eastern species in the numerous more 
willowlike leaves, the stout stem, the numerous heads in a more 
compact panicle and the short beak of the achenes. 
Ipauo: Lake Pend d’ Oreille, Aug. 5, 1885, E. L. Greene (type. 
in herb. Columbia Univeristy). 
New York BoTANICAL GARDEN, 
Bronx Park, NEW YorK CIty 
