232 PITTONIA. 
full description by Ledebour, of that Old World type, this 
Rocky Mountain plant makes no manner of approach to that. 
' T. murILUM. Foliage and involucres nearly or quite 
glabrous, the scapes arachnoid-villous: leaves narrow, 
simply and deeply runcinate-pinnatifid, the lobes narrow 
and acute: scapes many, erect from the very base; outer 
involueral bracts lanceolate and oblong-lanceolate, nar- 
rowed above, thence widening to a triangular cleft tip; 
inner ones lanceolate, but with a long linear tip, this occa- 
sionally bicorniculate, but more commonly with one of the 
two horns obsolete: achenes muricate at summit, the 
angles below somewhat serrate or tuberculate; the beak 
barely twice the length of the achene. 
Johnson River, Alaska, 27 June, 1899, Capt. E. F. Glenn; 
the type specimens in the herbarium of the Missouri 
Botanic Garden. 
v T. ANGUsTIFOLIUM. Glabrous throughout; crown of the 
root usually much branched and the leaves and scapes 
numerous: leaves depressed, of oblong-linear outline, 4 to 6 
inches long, 3 to $ inch wide, obtuse or mucronately acute, 
from sharply and remotely denticulate to coarsely dentate, 
the teeth all simple, opposite, seldom runcinate: scapes 
rather slender, slightly decumbent, in maturity twice the 
length of the leaves: involucres rather narrow and few- 
flowered, their outer bracts few and small, in a single series, 
or at least scarcely biserial, broadly lanceolate to oblong, 
erect: achenes chestnut-brown, spinulose-muricate at sum- 
mit, smooth and obtusely costate from above the middle to 
the base; beak about thrice the length of the achene. 
Open subalpine meadows along Dale Creek, Wyoming, 
1 July, 1896, collected only by the writer. 
