Studies on the Rocky Mountain flora— XXV 
PER AXEL RYDBERG 
, Ptilocalais macrolepis Rydb. sp. nov. 
Perennial with fusiform roots; stem glabrous, 2-5 dm. high, 
somewhat branched, glabrous or minutely puberulent; lower 
leaves somewhat petioled, the upper sessile; blades linear-lanceo- 
late, entire or rarely pinnatifid with linear-lanceolate, divergent 
divisions; heads solitary at the ends of the slender naked branches; 
involucres turbinate, about 2 cm. high. Calyculate bracts 8-10, 
lanceolate or linear-lanceolate, 3-6 mm. long; bracts proper 
12-15, linear-lanceolate, attenuate; achenes about 7 mm. long, 
puberulent on the rounded angles or glabrate; pappus-scales 
lanceolate, 4-5 mm. long, gradually tapering upwards; bristles 
6-7 mm. long. 
In habit this species is intermediate between Ptilocalais nutans 
and P. major, with the head of the latter, but it differs from both 
in the pappus-scales. In the original description of Ptilophora 
major, Gray gives no description of the pappus, stating that his 
specimens were too young. In the Columbia University her- 
barium there is a duplicate of the type, collected by Spalding. 
This has fairly well developed fruit and shows that Ptilocalais 
major has practically the same pappus as P. nutans, i. e., the 
paleaceous portion is only 2 mm. long, oblong in outline, truncate 
and somewhat 3-toothed at apex. P. macrolepis grows in sandy 
soil at an altitude of 1200-1500 m. 
Urau: Benches near Salt Lake City, Apr. 30, 1904, A. O. 
Garrett 182 (type, in herb. N. Y. Bot. Gard.); Red Rock Cafion, 
June 11, 1905, Rydberg 6105 ; Salt Lake City, May 12, 1880, M. E. 
Jones 1707 (at least in part); benches near Salt Lake, June 1, 
1900, Stokes. 
PTILORIA 
Professor Nelson, in the New Manual of Botany of the Central 
Rocky Mountains, restores the name Stephanomeria, following 
the Vienna Rules. The only criticism I have to make of the 
treatment of the genus is that he has reduced Ptiloria ramosa 
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