196 



GENUS CHRYSOTHAMNUS. 



matic, 4-angled to rather equally 8-ribbed, tapering slightly to the base, 5 to 5.5 mm. 

 long, smooth or obscurely pubescent towards the summit; pappus slightly longer than 

 the corolla, fine and soft, brownish tinged. 



Plains and lower mountains of the Southwest: southern Colorado and New Mexico 

 to northern Arizona, Nevada, and Utah. Tjrpe locality, "in the Sierra of Upper Cali- 

 fornia," as stated by Nuttall, but the type specimen is labeled Rocky Mountains, and 

 the species is not known from California. Collections: Type collection, Nuttall (Gr); 

 Naturita, southwestern Colorado, August 25, 1920, Payson (UC); Sangre de Cristo, 

 Colorado, Parry 104 (Gr); Cimarron, Colorado, September, 1890, Jones (Gr, UC, US); 

 near Dulce, Rio Arriba County, New Mexico, Standley 8087 (US) ; San Francisco Moun- 

 tains, Arizona, October, 1884, Lemmon (UC) ; Bright Angel Trail, Grand Canon, Arizona, 

 October 22, 1905, Eastwood (US); Pioche, southeastern Nevada, September 4, 1912, 

 Jones (UC); Montezuma Canon, southeastern Utah, Rydberg and Garrett 9676 (NY, 

 UC); Marysvale, Utah, Jones 58^7 (NY, UC, US). 



SYNONYMS. 



1. BiGELOviA DEPREssA Gray, Proc. Am. Acad. 8:643, 1873. C. depressus. 



2. LiNOSTRis DEPRESSA ToiTey in Sitgreaves Rep. 161, 1854. C. depressus. 



RELATIONSHIPS. 



There is every evidence of close consanguinity between C. depressus and C. pulchellus. 

 The two are connected not only by the general habit, the nature of the woody twigs, 

 etc., but by the similarly shaped corollas, the short style-appendages as compared with 

 the stigmatic portion, and especially by the numerous strongly keeled bracts which are 

 arranged in 5 very sharply defined rows. While there is a general tendency to vertical 

 rows in the involucres of all of the species, it is nowhere so pronounced as here. The 

 contact between these two species is suggested by C. pulchellus elatior, in which the 

 pubescence is very similar to that of depressus. On the other hand, the characters 

 separating depressus and pulchellus, although not marked, are suflBcient for actual species. 

 The leaf of the former is of the oblanceolate type, that is, widest above the middle, 

 while in the latter the leaves are always linear; the corolla in depressus is only about 

 8 mm. long, in pulchellus it is 10 to 14 mm. long. This elongation of the flowers in 

 pulchellus, accompanied as it is by a longer pappus, gives to the heads a very charac- 



Tablg 21. — Variation in Chrysothamnus depressus. 



