CATALOGUE. 141 



flowers is sometimes produced into about six small, rigid bristles; involucre 

 glutinous, with spreading tips; receptable flattish, alveolate. Separated 

 from Gutierresia by Bentham and Hooker on account of its numerous rays 

 and coroniform pappus. — San Pedro River, Arizona (551), and old Camp 

 Crittenden, Arizona (667). 



Gutieeeezia Euthamije, T. & G.— (411, 412, 414, 415.) 410 is the 

 same, verging toward microcephala ; from Colorado, Arizona, New Mexico. 

 Number 378 of the Sutton Hayes Collection appears in my herbarium 

 under name of G. microcephala, and doubtless correctly, but it is so near 

 some forms obtained by the Expedition that pass for G. Euthamia that one 

 may well doubt the propriety of keeping them distinct. 



Gbindelia SQUAEEOSA, Dunal. — Colorado (Loew, 100). Utah. 



Geindelia miceocephala, DC. (G. inuloides, Willd., var. microcephala, 

 Gray, Bot. Mex. Bound, p. 81.) — Stems erect, smooth, branching some- 

 what; leaves thick, rigid, oblong, entire or slightly toothed toward the apex. 

 Amplexicaule or sessile, inflorescence cymose(T); pappus (in my specimen) 

 none in the ray-flower, and of only two awns in the disk ; scales of the 

 involucre almost always destitute of subulate tips, thick, oblong, and 

 acute in several series, the inner of which are the larger ; achenia flat- 

 tened, four-angled, with corky angles, smooth. — Southern Arizona (706). 



Heteeotheca* scabea, DC. — Erect, much branching, somewhat rough, 

 with long, spreading hairs arising from glandular bases ; upper leaves 

 rough, veiny, sessile or clasping, oblong or ovate, entire or toothed ; lower 

 ones petioled; inflorescence in a spreading panicle; achenia of the ray 

 smooth, of the disk densely covered with appressed silky hairs. — Moist 

 ground near Camp Lowell, Ariz. (703). 



Chbysopsis villosa, Nutt. — From among the multitude of forms under 



* Heteeotheca, Cass. — Heads beterrgamous, radiate, with the rays in 1-2 series and pistillate; 

 flowers of the disk perfect. Involucre hemispherical or broadly campannlate; bracts imbricated in many 

 series, narrow margin subscarioue, exterior ones smaller. Eeceptacle flat, alveolate, fimbrillate. Female 

 flowers with ligulate, sub-entire corollas. Perfect flowers with regular, tubular corollas, somewhat 

 enlarged above and 5-cleft. Anthers obtuse, entire, or a little emaiginate at base. Branches of the 

 styles of the perfect flowers flat, with long, narrow, or sometimes triangular and short appendages. 

 Achenia flat, with a thickish margin and an obtuse apex. Pappus of the ray none, of the disk of an 

 outer series of very short bristles, and an inner series of long scabrous bristles. — Erect, rough herbs, 

 with alternate snd often dentate leaves. Heads rather large, loosely paniculate or in a close corymb. 

 Flowers all yellow. Achenia glabrous or silky villous. Pappus rusty -colored. — Bentham & Hooker. 



