GENUS I9. CHICORY FAMILY. 373 
19. AGOSERIS Raf.; D. Dietr. Syn. Pl. 4: 1332. 1847. 
[Troxiuon Nutt. Fras. Cat. 1813. Not Gaertn. 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 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. 
Head 12’ broad; achenes 5”-6” long. 
Achenes beakless. 
1. Agoseris glauca (Pursh) D. Dietr. 
Large-flowered Agoseris. Fig. 4081. 
T. glaucum Pursh, Fl. Am. Sept. 505. 1814. 
Agoseris glauca D. Dietr. Syn. Pl. 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, 2-10’ long, 2-10” wide, acuminate at 
the apex, narrowed at the base, sometimes into 
margined petioles; scapes stout, glabrous or 
slightly pubescent, longer than the leaves, often 
134° high; head 1-2’ 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 oe 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. 1841. 
Troximon glaucum var. parviflorum A. Gray, Syn. FL. 
I: Part 2, 437. 1884. 
Agoseris parviflora D. Dietr. Syn. Pl. 4: 1332. 1847. 
Perennial, glabrous throughout; scape slender, 
much longer than the leaves, 5-15’ high. Leaves 
narrowly linear, acuminate, entire, 3-8’ long, ° 
1-24” 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 and New Mexico. Called also false dande- 
lion. May-July. 
