928 FLORA. 



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 20 species of western N. Am., 

 Mex. and western S. Am. Besides the following some 10 others occur in the south- 

 western U. S. 



1. Gutierrezia Sardthrae (Pursh) Britt. and Rusby. Gutierrezia. (I. F. f. 

 3647.) Glabrous or minutely pubescent, bushy, 1-6 dm. high, the branches rigid, 

 ascending. Leaves linear, 1-3.5 cm - l° n g> I-2 mm - wide, acute; heads oblong, 

 3-4 mm. high, few-flowered, usually in clusters of 2-5 at the ends of the numerous 

 branches; rays 1-6, scarcely 2 mm. long; scales of the pappus linear-oblong, sub- 

 ulate or acuminate; achenes pubescent. In dry or rocky soil, Minn, and Manitoba 

 to western Neb., Tex. and Sonora, west to Nev., Ariz, and Cal. Aug. -Sept. 



11. AMPHIACHYRIS DC. 



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 U. S. 



1. Amphiachyris dracunculoides (DC.) Nutt. Amphiachyris. (I. F. f. 

 3648.) Annual, slender, much branched, 15-45 cm. high, the branches ascending. 

 Leaves linear, 12-35 mm. long, 2-4 mm. wide, acutish, the uppermost almost fili- 

 form; heads solitary at the ends of short branches, 10-30-flowered, about 4 mm. 

 high; involucre hemispheric, 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, Mo. 

 and Kans. to Tex. ; adventive at Easton, Penn. Sept.-Oct. 



12. GRINDELIA Willd. 



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

 or clasping leaves, usually spinulose-dentate, and rather large heads of both discoid 

 and radiate yellow flowers, solitary at the ends of the branches (rays rarely want- 

 ing). Involucre hemispheric or depressed, 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, glabrous, 4-5-ribbed. 

 Pappus of 2-8 soon deciduous awns or bristles. [Named for Prof. H. Grindel, o: 

 Riga, 1776-1836.] About 25 species, natives of western N. Am., Peru and Chili. 

 Besides the following, some 15 others occur in western N. Am. 



Leaves spatulate to oblong-, obtuse or obtusish ; achenes truncate. 1. G. squarrosa. 



Leaves linear or linear-oblong, acute ; achenes 2-toothed. 2. G. lanceolata. 



I. Grindelia squarrosa (Pursh) Dunal. Broad-leaved Gum- pi. ant 

 (I. F. f. 3649.) Glabrous, erect or ascending, 2-6 dm. high. Leaves oblong or 

 oblong-spatulate, obtuse, more or less clasping at the base, sharply dentate, some 

 times laciniate, 1-3.5 cm - long, 6-12 mm. wide; heads very glutinous; bracts ol 

 the involucre linear-lanceolate, subulate-tipped, strongly squarrose; achenes trun 

 cate, those of the outer flowers usually thicker than those of the inner: pappus of 

 2 or 3 awns. In dry soil, 111. and Minn, to Manitoba, south to Mo., Tex., Nev. 

 and Mex. Adventive in southern N. J. June-Sept. 



Grindelia squarrosa niida (Wood) A. Gray. Rays wanting. Mo. and westward with 

 the type. 



3. Grindelia lanceolata Nutt. Narrow-leaved Gum plant. (I. F. f. 

 3650.) Slender, erect, glabrous, about '» dm. high, heaves lanceolate or linear, 

 acute at the apex, sessile or clasping at the base, spinulose-dentate, laciniate, or 



