Krulll the BlJLLKTIN OP THE TOKREY BOTANICAL Cn'K, 38: II-23. ig 1 1 



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 1200-15001T1. 



Utah: Benches near Salt Lake City, Apr. 30, 1904, A. 0. 



Garrett 182 (type, in herb. N. Y. Bot. Gard.); Red Rock Canon, 



June 11, 1905, Rydberg 6 105 ; 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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