1 From the Bulletin 6f the ToRRBV Botanical Cub, 37: 443-471. 1910.] 



Studies on the Rocky Mountain flora — XXIII 



Per Axel Rydberg 



Gaillardia Mearnsii sp. now 



Annual; stem 1-3 dm. high, leafy only towards the base, 

 finely pubescent; basal leaves oblanceolate or spatulate, petioled, 

 5-10 cm. long, puberulcnt, entire or round-lobed; upper leaves 

 similar or sometimes pinnatifid with rounded lobes; peduncles 

 1-2 jdm. high; involucres about 2 cm. broad; bracts lanceolate, 

 acute, grayish-pubescent; disk-corollas purple, their lobes short 

 and rounded, fimbriate; pappus-scales lanceolate, each gradually 

 attenuate into a slender awn equaling the corolla; rays yellow, 

 10-15 mm. long. 



The type sheets were labeled G. aristata, which it somewhat 

 resembles in general habit, but the lobes of the disk-corollas are 

 not attenuate. It resembles, however, still more, G. arizonica 

 in the annual root, the stem naked above, and the leaf-form, al- 

 though the leaves are more inclined to be entire; but it differs 

 from that species in the purple disk and the gradually acuminate 

 and long-aristate pappus-scales. On the whole, it is therefore 

 more nearly related to G. pinnatifida, although the plant is evi- 

 dently an annual and the leaves are seldom pinnatifid. When 

 pinnatifid, their lobes are short and rounded. 



Arizona: Fort Verde, May 4. 1888, Mearns 322 (type, in 

 herb. N. Y. Bot. Gard.). 



Utah: Sandy bluffs near Green River, June 12, 1900, Stokes. 



Tetraxeuris 

 In Coulter & Nelson's New Manual the name Actinella Nutt. 

 has been readopted for this genus, apparently in conformity with 



443 



