658 CONTRIBUTIONS FEOM THE NATIONAL HEEBAEIUM. 



New Mexico: Cross L Ranchi; Raton; San Rafael; Animas Valley; Organ Moun- 

 tains; White Mountains. Plains and low hills, in the Upi^er So no ran and Transition 

 zones. 



7. Gutierrezia juncea Greene, Pittonia 4: 56. 1899. 



Type locality: Near Gray, New Mexico. Type collected by Miss Josephine 

 Skehan (no. 78). 



Range: Oklahoma and Colorado to New Mexico and Arizona. 



New Mexico: Clayton; Mcintosh; Carrizozo; Gray; Nara Visa; Estancia; White 

 Oaks; Endee; Ogle. Plains, in the Lower and Upper Sonoran zones. 



8. Gutierrezia tenuis Greene, Pittonia 4: 55. 1899. 

 Gutienezia linearis Rydb. Bull. Torrey Club 31: 647. 1904. 

 Gutierrezia goldrnanii Greene, Repert. Nov. Sp. Fedde 7: 195. 1909. 



Type locality: Foothills of the mountains back of Silver City, New Mexico. 



Range: Colorado and Arizona to western Texas. 



New Mexico: Common at lower altitudes nearly throughout the State. Plains and 

 hills, in the Lower and Upper Sonoran zones. 



This is by far our commonest species. It is found almost everywhere at low and 

 middle elevations, all over the State except in the extreme southwestern corner. In 

 most localities where it occurs it is very abundant and one of the most characteristic 

 plants. It is especially prominent upon overstocked ranges and spreads rapidly 

 where overstocking takes place. This and the other species are known variously as 

 "yellow weed," "brownweed," "sheepweed," "snakeweed," and "yerbadevibora." 



The tyi^e of Gutierrezia linearis came from Gray {Earle 474), and that of G. goldrnanii 

 from the Florida Mountains {Goldman in 1908). 



16. HETEROTHECA Cass. 



Annual or biennial herb, glandular and hirsute, the leaves alternate, oblong or 

 oblong-ovate, serrate, those of the stem clasping; involucre 7 to 8mm. high, the bracts 

 linear-lanceolate to linear, acuminate; rays yellow; achenes flattened, those of the 

 rays without pappus, those of the disk with pappus in 2 series, the inner of numerous 

 long slender tawny bristles, the outer of very short ones. 



1. Heterotheca subaxillaris (Lam.) Britt. & Rusby, Trans. N. Y. Acad. 7: 10. 

 1887. 

 Inula subaxillaris Lam. Encycl. 3: 259. 1789. 

 Type locality: "Dans le Caroline, le Maryland." 

 Range: Delaware and Kansas to Florida and eastern New Mexico. 

 New Mexico: Nara Visa {Fisher 49). Open fields and jjlains, in the Upper Sonoran 

 Zone. 



17. CHRYSOPSIS Nutt. 



Perennial herbs with usually numerous stems and large, soHtary or corymbose heads; 

 leaves entire, mostly sessile; heads many-flowered, with numerous bright yellow 

 rays; involucre campanulate or hemispheric, of narrow, much imbricated bracts; 

 achenes compressed, obovate; pappus in 2 series, the inner of numerous capillary 

 scabrous bristles, the outer of minute short bristles. 



key to the species. 



Heads subtended by few to many, thin, broad, leaflike bracts. 



Plants appressed-sericeous throughout 1. C. nitidula. 



Plants with spreading pubescence, never sericeous. 



Floral leaves ovate, acute; leaves merely scaberulous, 



very glandular; stems slender 2. C. cnjploccpliala. 



