379 COMPOSITAE. Vor. III. 
perfect, or some of them only staminate, the corolla-limb 5-lobed. Involucre ovoid, or 
narrowly campanulate, its bracts coriaceous, imbricated in few series. Receptacle flat, convex 
or conic, commonly foveolate. Anthers obtuse and entire at the base. Style-branches narrow, 
flattened, their appendages slender. Achenes terete, ribbed or 5-angled. Pappus of several 
scales, those of the ray-flowers shorter than or equalling those of the disk. [Named from 
Gutierrez, a noble Spanish family.] 
About 25 species, natives of western North America, Mexico and western South America. 
Besides the following, several others occur in the western United States. Type species: Gutierrezia 
linearifolia Lag. 
1. Gutierrezia Saréthrae (Pursh) Britton and Rusby. Broom-weed. Fig. 4190. 
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Solidago Sarothrae Pursh, Fl. Am. Sept. 540. 1814. 
Gutierrezia Euthamiae T.&G.FI. N. A. 2: 193. 1841. 
Gutierrezia Sarothrae Britton & Rusby, Trans. N. Y. 
Acad. Sci. 7: 10. 1887. Soe 
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Glabrous or minutely pubescent, bushy, woody 
at the base, $°-14° high, the branches rigid, as- 
cending. Leaves linear, 4’-14’ long, 4’-1” wide, 
acute; heads oblong, 14-2” 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 Knear-oblong, subulate or 
acuminate; achenes pubescent. 
In dry or rocky soil, Manitoba and Minnesota to 
western Nebraska, Kansas, Texas and Sonora, west to 
Alberta and Utah. Adventive at Rochester, N. Y. 
Far western plants formerly referred to this species. 
prove to be distinct. Rabbit-brush. Aug.—Sept. 
Gutierrezia linearis Rydb., of the Rocky Mountain 
region, ranging eastward into Kansas and Nebraska, 
differs in being more woody and has somewhat wider 
y leaves. 
11. AMPHIACHYRIS [DC.] Nutt. Trans. Am. Phil. Soc. II. 7: 313. 1841. 
Erect, much branched, glabrous herbs, with small alternate entire leaves, and very 
numerous 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 ray-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 following typical. 
1. Amphiachyris dracunculoides (DC.) 
Nutt. Amphiachyris. Fig. 4191. 
Brachyris dracunculoides DC. Mem. Soc. Phys. Gen. 
9: Part 2, 265. pl. 7. 1836. 
Amphiachyris dracunculoides Nutt. Trans. Am. Phil. 
Soc. (II.) 7: 313. 1841. 
Annual, slender, much branched, 6’-18’ high, the 
branches ascending. Leaves linear, 6-18’ long, 
1-2” wide, acutish, the uppermost almost fili- 
form; heads solitary at the ends of short branches, 
10-30-flowered, about 2” high; involucre hemi- 
spheric, its bracts oval, obtuse; rays 5-10, about 
as long as the involucre; disk-flowers 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 and 
New Mexico. Found adventive at Easton, Penna. 
Sept.—Oct. 
