320 



COMPOSITAE. 



[Vol. III. 



;*^ 



I. Gutierrezia Sarothrae (Pursh) Britt. 

 and Rusby. Gutierrezia. (Fig. 3647.) 



Solidago Sarolhrac Pursh, Fl. Am. Sept. 540. 1S14. 

 Gutierrezia Eullmmiae T. & G. Fl. N. A. 2: 193. 



1841. 

 Gutierrezia Sarothrae Britton & Rusbv, Trans. N. 



Y. ,\cad. Sci. 7: 10. 1887. 



Glabrous or minutely pubescent, bushy, J^°-2° 

 high, the branches rigid, ascending. Leaves 

 linear, yi'-\%' long, yi"-i" wide, acute; heads 

 oblong, 1^2 "-2" high, few-flowered, usually in 

 clusters of 2-5 at the ends of the numerous 

 branches; rays 1-6, scarcely 1" long; scales of 

 the pappus linear-oblong, subulate or acuminate; 

 acheues pubescent. 



In dry or rocky soil. Minnesota and Manitoba to 

 western Nebraska, Texas and Sonora, west to 

 Nevada, Arizona and California. Aug. -Sept. 



II. AMPHIACHYRIS DC. Not. PI. Rar. Jard. Gen. 7: i./>/. /. 1835. 



Erect, much branched, glabrous herbs, with small alternate entire leaves, and very nu- 

 merous small heads of both tubular and radiate yellow flowers, solitary or clustered at the 

 ends of the branches. Involucre ovoid or hemispheric, its bracts coriaceous, imbricated in 

 few series. Receptacle naked. Ray-flowers pistillate. Disk-flowers perfect, but sterile, 

 or staminate. Pappus of the raj'-flowers obsolete or coroniform, that of the disk-flowers of 

 5-20 subulate scales or bristles somewhat united at the base. Achenes pubescent. [Greek, 

 chaff-around.] 



Two known species, natives of the south-central United States. The genus is closely related to 

 the preceding one. 



I. Amphiachyris dracunculoides 



(DC.) Nutt. Amphiachyris. 

 (Fig. 3648.) 



Brachyris dracunculoides DC. Mem. Soc. Phys. 



Gen. 7: Part 2, 265. pi. i. 1836. 

 Amphiacln'ris dracunculoides Nutt. Trans. .\m. 



Phil. Soc. (11)7:313. 1841. 



Annual, slender, much branched, 6'-tS' high, 

 the branches ascending. Leaves linear, 6"-iS" 

 long, i"-2" wide, acutish, the uppermost al- 

 most filiform; heads solitary at the ends of short 

 branches, 10-30- flowered, about 2" high; invo- 

 lucre hemispheric, its bracts oval, obtuse; rays 

 5-10, about as long as the involucre; disk-flow- 

 ers mostly staminate, their ovaries abortive, 

 their pappus of 5-8 subulate aristate scales, 

 united into a short cup at the base. 



In dry soil, Missouri and Kansas to Texas. Found 

 advcntive at Easton, Penna. Sept. -Oct. 



12. GRINDELIA Willd. Gesell. Nat. Fr. Berl. Mag. i: 260. 1807. 



Perennial herbs, sometimes woody at the base, with alternate sessile or clasping leaves, 

 usually spinulose-dentatc, and rather large heads of both discoid and radiate yellow flowers, 

 solitary at the ends of the branches (rays rarely wanting). Involucre hemispheric or de- 

 pressed, its bracts imbricated in several or many series, usually subulate-tipped. Receptacle 

 flat or convex, naked, foveolate. Ray-flowers fertile. Disk-flowers perfect, or sometimes 

 only staminate. Anthers obtuse and entire at the base. Style-branches narrow, flattened, 

 their appendages linear or lanceolate. Achenes short, thick, sometimes compressed, gla- 

 brous, 4-5ribbed. Pappus of 2-8 soon deciduous awns or bristles. [Named for Prof. H. 

 Grindel, of Riga, 1776-1S36.] 



