694 COiSTTEIBUTIONS FEOM THE NATIONAL HERBAEIUM. 



48. GNAPHALIUM L. Cudweed. 



Floccose-woolly herbs with narrow sessile entire leaves and cymose or glomerate 

 heads of yellowish or whitish flowers; heads heterogamous, discoid; involucre of 

 numerous tliin scaiious bracts imbricated in several series; jjappus of numerous 

 scabrous bristles in a single series; achenes terete or compressed, mostly nerveless. 



KEY TO THE SPECIES. 



Heads leafy-bracted; plants low, usually less than 20 cm. 



Plants loosely floccose; leaves mostly oblong or oblanceolate . ,1. G. palustre. 

 Plants appressed-tomentose; leaves linear to linear-oblan- 

 ceolate. 



Stems erect, simple or with few erect branches 2. 0. strictum. 



Stemsabundantly divaricate-branched from the base... 3. G. angustifolium. 

 Heads not leafj^-bracted ; plants mostly 30 cm. liigh or more. 



Leaves green and gland ular-\iscid on the upper surface 4. G. decurrens. 



Leaves tomentose on both surfaces, not apparently A'iscid. 

 Leaves narrowed at the base, not decurrent; stems 

 slender, weak; heads numerous, loosely corym- 

 bose 5. G. wrightii. 



Leaves not narrowed at the base, decurrent; stems 



stout, erect; heads densely clustered at the ends 



of the branches. 



Bracts densely arachnoid at the base, nearly wliite; 



pubescence of the stems and leaves white; 



stems densely leaf\' throughout 6. G. chilense. 



Bracts nearly glabrous, yellowish; pubescence of 

 stems and leaves yellowish ; stems with onlj' 

 a few distant reduced leaves above 7. G. sulphur escens. 



1. Gnaphaliiim. palustre Nutt. Trans. Amer. Phil. Soc. n. ser. 7: 403. 1841. 

 Type locality: "Rocky Mountains, Oregon, California and Chili." 



Range: British Columbia and ilontana to California and northwestern New 

 Mexico. 



New Mexico: Cedar Hill {Standley 7930). Wet ground. 



2. Gnaphalimn strictum A. Gray, U. S. Rep. Expl. Miss. Pacif. 4: 110. 1856. 

 Type locality: Banks of the Rio Grande, near Albuquercjue, New Mexico. Type 



collected by Bigelow. 



Range: Colorado and Wyoming t-o Arizona and New Mexico. 



New Mexico: Albuquerque; Tunitcha Mountains; West Fork of the Gila; Santa 

 Fe Creek. Wet soil, in the Upper Sonoran and Transition zones. 



3. Gnaphalium angustifolium A. Nels. Bull. Torrey Club 26: 357. 1899. 

 Type locality: Head of AVoods Creek, Medicine Bow Mountains, Wyoming. 

 Range: Wyoming to northern New Mexico. 



New Mexico: Ch^ma; Ensenada. Wet soil, in the Transition Zone. 



4. Gnaphalium decurrens Ives, Amer. Joum. Sci. 1: 380. pi. 1. 1819. 

 Type locality: Near New Haven, Connecticut. 



PvANGe: Idaho and Nova Scotia to New Mexico and Pennsylvania. 



New Mexico: Santa Fe and La.s Vegas moimtains; Santa Rita; Black Range; Fort 

 Tularosa; Capitan Moim tains; White Mountains; Organ Mountains. Meadows, in the 

 Transition Zone. 



