146 Rydberg : Rocky Mountain flora 



Xylorrhiza lanceolata sp. nov. 



Shrubby perennial, with white stems ; branches more or less 

 villous ; leaves lanceolate, 4-6 cm. long, more or less villous, 

 especially when young, reticulately veined, dentate with spinu- 

 lose-subulate teeth, which are directed forward and then fal- 

 cately curved outward ; peduncles 1—2 dm. long ; involucre fully 

 I cm. high, 15—20 mm. broad; bracts lance-subulate, villous 

 and slightly glandular, attenuate and spinulose-tipped, the inner 

 about equaling the disk, a few of the outer ones often longer and 

 squarrose ; rays purple, about 2 cm. long ; achenes hirsute ; pap- 

 pus brownish tawny. 



This is related to Xylorrliiza tortifolia (T. & G.) Greene, but 

 differs in the broader leaves and their teeth. In X. tortifolia, the 

 body of the leaves is linear or narrowly linear-lanceolate, the teeth 

 are shorter and broader and diverge at almost right angles to the 

 midrib ; the outer bracts are neither elongated nor spreading. 



Utah: St. George, 1877, Palmer 208 (type, in herb. Colum- 

 bia Univ. and N. Y. Bot. Gard.) ; South Utah, 1875,/ E.John- 

 son; 1874, C. C. Parry gi ij). 



Unamia alba (Nutt.) Rydb. comb. nov. 



Imila (^Chrysopsis) alba Nutt. Gen. 2 : 152. 18 18. 



Aster albiis Eat. Man. Bot. 127. 1829. Not Aster albits^xWA. 



1826. 

 Doellingeria ptannicoides Nees, Gen. & Sp. Ast. 183. 1833. 

 Chrysopsis alba Nutt. ; Nees, Gen. & Sp. Ast. 183, as a synonym. 



1833- 

 Diplopappns albiis Hook. Fl. Bor.-Am. 2:21. 1834. 

 Heliastrum album DC. Prod. 5: 264. 1836. 



EncepJialus albiis Nutt. Trans. Am. Phil. Soc. II. 7: 299. 1840. 

 Aster ptarmicoides T. & G. Fl. N. Am. 2 : 160. 1841. 

 Unamia ptarmicoides Greene, Leaflets i : 6. 1903. 



From the various disposition which has been made of this 

 plant, it is evident that the species has been out of place in all the 

 genera to which it had been referred. I therefore agree with Dr. 

 Greene that it represents the type of a distinct genus. Unfortu- 

 nately Dr. Greene did not use the first available specific name, 

 which is here accepted. Usually the original publication is given 

 as CJirysopsis alba Nutt. Gen. 2: 152. 1818. In that work 



