Genus ig. 



CHICORY FAMILY. 



3 2 3 



19. AGOSERIS Raf.; D. Dietr. Syn. PL 4: 1332. 1847. 



[Troximon Nutt. Fras. Cat. 1813. Not Gaertn. i"yi.] 



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 series, 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 

 oblong, obovate, or linear, 10-ribbed, not flattened, beaked or beakless. Pappus of copious 

 slender simple white bristles or soft unequal narrow scales. [Greek, head- or chief-succory.] 



About 30 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. Type 

 species: Agoseris cuspidata (Pursh) D. Dietr. 



Achenes beaked. 



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



Head \'-z' broad; achenes 5"-6" long. 2. A. parviflora. 



Achenes beakless. 3. A. cuspidata. 



i. Agoseris glauca (Pursh) D. Dietr. 

 Large-flowered Agoseris. Fig. 4081. 



T. glaucum Pursh, Fl. Am. Sept. 505. 18 14. 



Agoseris glauca D. Dietr. Syn. PI. 4: 1332. 1847. 



Perennial, pale or glaucous, glabrous through- 

 out or a little woolly below. Leaves linear, 

 lanceolate, or oblong, entire, dentate or pinna- 

 tifid, 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 

 ii high; head l'-2' broad; involucre oblong- 

 campanulate, or broader in fruit, commonly 

 quite glabrous, its bracts lanceolate, acuminate, 

 often hyaline-margined ; achenes conspicuously 

 beaked, 5"-6" long, when mature longer than 

 the copious pappus of rather rigid scabrous or 

 denticulate bristles. 



Minnesota to South Dakota, Saskatchewan, 

 south to Kansas (according to Smyth), Colorado 

 and Utah. May-July. 



2. Agoseris parviflora (Nutt.) D. Dietr. 

 Small-flowered Agoseris. Fig. 4082. 



Troximon parviflorum Nutt. Trans. Am. Phil. Soc. 7 : 



434- 1 84 1. 

 Troximon glaucum var. parviflorum A. Gray, Syn Fl 



1 : Part 2, 437. 1884. 

 Agoseris parviflora D. Dietr. Syn. PI. 4: 1332. 1847. 



Perennial, glabrous throughout; scape slender, 

 much longer than the leaves, 5-15' high. Leaves 

 narrowly linear, acuminate, entire, 3-8' long, 

 i"-2i" wide; head 1' broad or less; involucre ob- 

 long-ovoid, becoming nearly hemispheric in fruit, 

 6"-8" high, glabrous, its bracts lanceolate, acumi- 

 nate; achenes conspicuously beaked, about 4" long; 

 pappus of numerous unequal very slender bristles. 



Plains, North Dakota to Nebraska. Manitoba, Al- 

 berta, Idaho arid New Mexico. Called also false dande- 

 lion. May-July. 



