668 CONTRIBUTIONS FROM the national herbarium. 



1. Euthamia occidentalis Nutt. Trans. Amer. Phil. Soc. n. per. 7: 326. 1S41. 

 8 iidago occidentalis Torr. & Gray. El. X. Amer. 2: 226. 1841. 

 Type locality: "Banks of the Oregon and Wahlamet. and Lewis River." 

 Range: Washington and Montana to Colorado and New Mexico. 

 New Mexico: Mesilla Valley. Lower Sonoran Zone. 



28. SOLIDAGO L. Goldexrod. 



Perennial herb? with sessile or nearly sessile, alternate leaves and very numerous 

 racemose or clustered, small heads of yellow flowers: heads few to many-flowered, 

 the rays 1 to 16, pistillate: bracts appressed, without herbaceous tips; receptacle 

 naked: achenes terete, many -ribbed, with simple pappus of nearly equal capillary 

 bristles. 



KEY TO THE SPECIES. 



Leaves glabrous, or slightly pubescent along the veins and 

 margins. 

 Leaves not triple-veined; branches of the inflorescence 

 short, not recurved -spread ins:; heads not secund. 

 Plants low, 10 to 15 cm. high: inflorescence with few 



heads, short, congested 1. S. dccumbens. 



Plants taller. 20 to 40 cm.; inflorescence with many- 

 heads, elongated. 

 Branches of the inflorescence villous: leaves cilia te 



at the base 2. S. scopitlorum. 



Branches of the inflorescence not villous; leaves not 

 ciliate. 

 Heads about 7 mm. high; bracts acute or 



abruptly acuminate 5. S. neomexicana. 



Heads about 5 mm. high.; bracts obtuse, thick. 



Rays pale yellow 4. S. oreopkila. 



Rays deep golden yellow 3. S. aureola. 



Leaves triple-veined; heads mostly secund on longer re- 

 curved branches. 

 Cauline leaves lanceolate; stems tall, usually a meter 



high or more, deep purple at the base 9. .S 1 . pitcheri. 



Cauline leaves oblanceolate or narrower; stems usually 

 lower, not deep purple at the base. 

 Heads fully 5 mm. high; stems stout ; branches of the 



inflorescence long and widely spreading 6. 5. marshallii. 



Heads 4 mm. high or less; stems more slender: 

 branches of the inflorescence narrower and less 

 spreading. 

 Plants nearly 1 meter high, very slender; cau- 

 line leaves Linear or linear-oblanceolate; 



inflorescence very narrow 7. S. tenuissima. 



Plants lower, stout; cauline leaves lanceolate; 

 inflorescence broader, the branches 



stouter, spreading S. S. glaberrima. 



Leaves canescent, usually on both surfaces. 



Leaves lanceolate to ovate: plants mostly 1 meter high or 

 more (lower in 5. bigelovii). 

 Leaves broadly lanceolate or ovate; branches of the 



inflorescence erect ; heads not secund 14. <S. bigelovii. 



Leaves lanceolate or narrowly so; branches of the in- 

 florescence spreading; heads secund. . 



