1510 CONTRIBUTIONS FROM THE NATIONAL HERBARIUM 



1. Pluchea adnata (Hiimb. & Bonpl.) Mohr, Contr. U. S. Nat. Herb. 6: 790, 



1901. 



Baccharis adnata Humb. & Bonpl.; Willd. Eniim. PI. 2: 870. 1809. 



Conyza adnata H. B. K. Nov. Gen. & Sp. 4: 74. 1820. 



Pluchea subdecurrens Cass. Diet. Sci. Nat. 42: 4. 1826. 



Sonora to Michoacdn and Puebla. Guatemala; t3'pe from "America meri- 

 dionali." 



Sufirutescent, about 1 meter high, glandular and loosely pilose; leaves linear to 

 lanceolate, 3.5 to 11 cm. long, 4 to 22 mm. wide, entire to sharph* toothed, con- 

 spicuously decurrent; panicles 4 to 13 cm. wide, rounded; heads 4 to 8 mm. thick; 

 involucre 3 to 5 mm. high; inner phyllaries caudate-attenuate. "Jara" (Micho- 

 acdn or Guerrero). 

 la. Pluchea adnata canescens (A. Gray) Blake. 



Pluchea subdecurrens canescens A. Gray, Proc. Amer. Acad. 5: 182. 1861. 



Sinaloa to Coahuila, Tamaulipas, and Guerrero; type from Tantoyuca, Vera- 

 cruz. 



Plant more or less densely canescent-tomentose. "Santa Isabel" (Tamauli- 

 pas). 

 lb. Pluchea adnata parvifolia (A. Gray) Blake. 



Pluchea subdecurrens j)arn'folia A. Gray, Proc. Amer. Acad. 5: 160. 1861. 



Southern Baja California; type from vicinity of Cape San Lucas. 



Very densely viscid-glandular, with few or no long hairs; heads 7 to 12 mm. 

 thick; involucre 5 to 6 mm. high. 



2. Pluchea sericea (Nutt.) Coville, Contr. U. S. Nat. Herb. 4: 128. 1893. 

 Poly pappus sericeus Nutt. Journ. Acad. Phila. II. 1: 178. 1848. 



Tessaria borealis "DC.;" Torr. & Gray in Emory, IMil. Reconn. 143. 1848, 

 nomen nudum. 



Pluchea borealis A. Gray, Proc. Amer. Acad. 17: 212. 1882. 



Berthelotia sericea Rydb. Bull. Torrey Club 33: 154. 1906. 



Sonora, Chihuahua, and Baja California. Southwestern United States; type 

 from California. 



Shrub up to 5 meters high, silky-canescent, very leafy; leaves narrowly 

 elliptic or lance-elliptic, entire; corymbs small, terminating branches and branch- 

 lets; phyllaries ovate to oblong, obtuse to acute. "Cachanilla," "cachimilla" 

 (California, Texas, New Mexico). 



The shrub is abundant in many places in the alluvial soil of river vallej's, 

 often forming dense and pure stands. By the Indians the slender straight stems 

 were used for the shafts of arrows and for making bird cages, storage bins, and 

 baskets. An infusion of the stems was emploj-ed by the Pimas as a remedy for 

 sore eyes. 



3. Pluchea odorata Nat. (L.) Cass. Diet. Sci. Nat. 42: 3. 1826. 

 Conyza odorala L. Syst. Nat. ed. 10. 2: 1213. 1759. 



IComjza cortesii H. B. K. Nov. Gen. & Sp. 4: 75. 1820. 



? Pluchea cortesii DC. Prodr. 5: 452. 1836. 



Baja California and Sinaloa to Tamaulipas, south to Yucatan. Florida, Cen- 

 tral and South America, West Indies; type from Jamaica. 



Shrubby, 2.5 meters high or less, the stem cinereous-tomentose or sordid- 

 tomentose, glabrescent below; petioles 1 to 2.5 cm. long; leaf blades elliptic to 

 oval or oblong-ovate, 6 to 20 cm. long, 2.5 to 10 cm. wide, entire or sometimes 

 repand-denticulate, paler and sordid-tomentulose beneath; panicles usually 10 to 

 20 cm. wide. "Santa Maria" (Tamaulipas, Yucatdn); "alinanche" (Sinaloa); 

 "hierba de Santa Maria" (Nuevo Leon); "chalche" (Yucatan, Guatemala, 

 Maya); "canela," "canel6n" (Baja California); "chalchay" (Yucatdn); "su- 



