Voi,. III.] 



CHICORY FAMILY. 



277 



2. Lygodesmia rostrata A. Gray. 



Beaked Lygodesmia. 



(Fig- 3547-) 



L. juncea var. rostrata A. Gray, Proc. Phil. 



Acad. 1863: 69. 1863. 

 Lygodesmia rostrata A. Gray, Proc. Am. 



Acad. 9: 217. 1874. 



Annual, less rigid; stem striate, leafy, 

 paniculately branched, i-3 high. Leaves 

 elongated-linear, acuminate, entire, 3- 

 nerved. the lower $'-,' long, \"-\ l /z" 

 wide, the uppermost very small and sub- 

 ulate; heads numerous, 7-10-flowered, 

 about %' broad, racemose along the 

 branches on scaly short erect peduncles; 

 involucre 5 // -7 // high; achenes narrowly 

 fusiform, narrowed or somewhat beaked at 

 the summit, 5-8-ribbed or -striate, 4 // -5 // 

 long, longer than the whitish pappus. 



Western Nebraska (according to Webber) 

 to the Northwest Territory, Colorado and 

 Wyoming. Aug. -Sept. 



17. AGOSERIS Raf. Fl. Ludov. 58. 1817. 

 [Troximon Nutt. Fras. Cat. 1813. Not Gaertu. 1791.] 

 Perennial or annual herbs, mostly acaulescent, with tufted usually sessile basal leaves, 

 and solitary heads of yellow or rarely purple flowers at the end of a naked or bracted scape. 

 Involucre campanulate or oblong, its bracts imbricated in several rows, appressed, or with 

 spreading tips, membranous or herbaceous, not thickened after flowering, the outer ones 

 gradually shorter and broader. Receptacle flat, naked or foveolate. Rays truncate and 5- 

 toothed at the apex. Anthers sagittate at the base. Style-branches slender. Achenes ob- 

 long, obovate, or linear, 10-ribbed, not flattened, beaked at the summit. Pappus of copious 

 slender simple white bristles. [Greek, head- or chief-succory.] 



About 25 species, natives of western and southern North America and southern South America. 

 Besides the following, some 20 others occur in the western parts of the United States. 

 Head i'-2' broad, achenes 5" -6" long. 1. A. glauca. 



Head 1' broad or less; achenes about 3" long. 2. A. parvi/tora. 



i. Agoseris glauca (Pursh) Greene. 



L,arge-flowered Agoseris. 



(Fig. 3548.) 



T. glaucum Pursh, Fl. Am. Sept. 505. 1814. 

 Agoseris glauca Greene, Pittonia, 2: 176. 1891. 



Perennial, pale or glaucous, glabrous 

 throughout or a little woolly below. Leaves 

 linear, lanceolate, or oblong, entire, dentate 

 or pinnatifid, 2 / -io / long, 2 // -io // wide, 

 acuminate at the apex, narrowed at the base, 

 sometimes into margined petioles; scapes 

 stout, glabrous or slightly pubescent, longer 

 than the leaves, often i}i high; head \'-i' 

 broad; involucre oblong-campanulate, or 

 broader in fruit, commonly quite glabrous, 

 its bracts lanceolate, acuminate, often hya- 

 line-margined; achenes conspicuously beak- 

 ed, 5 // -6 // long, when mature longer than 

 the copious pappus of rather rigid scabrous 

 or denticulate bristles. 



South Dakota to the Northwest Territory, south to Kansas (according to Smyth), Colorado and 

 Utah. May-July. 



