664 CONTRIBUTIONS FROM THE NATIONAL HERBARIUM. 



Stems and leaves conspicuously floccose, at least 

 when young. 

 Pubescence all or nearly all floccose, dense and 



persistent 4. S. wootoni. 



Pubescence mostly glandular or scabrous, the 



floccose hairs soon deciduous 5. S. spinulosus. 



Stems and leaves never floccose. 



Plants glabrous throughout, or puberulent only 

 on the bracts. 

 Stems slender, branched, sparingly leafy; 

 leaves with few shallow teeth, bright 



green; heads few, solitary 6. S. laevis. 



Stems stout, simple up to the inflorescence, 

 densely leafy; leaves deeply toothed 

 or pinnatifid, somewhat glaucous; 

 heads numerous, clustered at the 



ends of the branches 7. S. glaberrimus. 



Plants abundantly pubescent. 



Annual; stems strigose 8. S. gracilis. 



Perennial; stems glandular-puberulent 9. S. austral is. 



1. Sideranthus viscidus Woot. & Standi. Contr. U. S. Nat. Herb. 16: 180. 1913. 

 Type locality: Near Hope, New Mexico. Type collected by Wooton, August 3, 



1905. 

 Range: Plains of southeastern New Mexico. 

 New Mexico: Near Hope; Dayton. 



2. Sideranthus grindelioides (Nutt.) Britton, Bull. Torrey Club 27: 620. 1900. 

 Eriocarpum grindelioides Nutt. Trans. Amer. Phil. Soc. n. ser. 7: 321. 1841. 



Type locality: "On shelving rocks in the Rocky Mountain range, Oregon." 

 Range: Manitoba and Nebraska to Arizona and New Mexico. 



New Mexico: Carrizo Mountains; Tunitcha Mountains; Farmington. Dry plains 

 and hills, in the Upper Sonoran Zone. 



3. Sideranthus serratus (Greene) Standley, Contr. U. S. Nat. Herb. 13: 222. 



1910. 



Eriocarpum serratum Greene, Bull. Torrey Club 25: 119. 1898. 



Type locality: White Mountains, New Mexico. Type collected by Wooton (no. 

 251). 



Range: Southeastern New Mexico. 



New Mexico: White and Sacramento mountains; Capitan Mountains; west of 

 Roswell; Queen. Transition Zone. 



4. Sideranthus wootoni (Greene) Standley, Contr. U. S. Nat. Herb. 13: 222. 



1910. 



Eriocarpum wootoni Greene, Bull. Torrey Club 25: 120. 1898. 



Type locality: White Mountains, New Mexico. Type collected by Wooton 

 (no. 518). 



Range: New Mexico. 



New Mexico: Farmington; Laguna; Albuquerque; Roswell; White Mountains. 

 Hills and plains, in the Upper Sonoran Zone. 



5. Sideranthus spinulosus (Pursh) Sweet, Hort. Brit. 227. 1826. 

 Amellus spinulosus Pursh, Fl. Amer. Sept. 564. 1814. 

 Aplopappus spinulosus DC. Prodr. 5: 347. 1836. 



Type locality: "In open prairies on the Missouri." 

 Range: Montana and Minnesota to Arizona and Texas. 



