630 CONTRIBUTIONS FROM THE NATIONAL HERBARIUM. 



4. Crepis chamaephylla Woot. & Standi. Contr. U. S. Nat. Herb. 16: 175. 1913. 

 Type locality: North end of the Carrizo Mountains, northeast corner of Arizona. 



Type collected by Standley (no. 7419). 

 Range: Known only from the type locality, in the Upper Sonoran Zone. 



5. Crepis petiolata Rydb. Bull. Torrey Club 32: 134. 1905. 



Type locality: Along Bear River, five miles east of Hayden, Colorado. 

 Range: Wyoming to New Mexico. 



New Mexico: Chama; Cienaga Ranch; Tularosa Creek; Costilla Valley; Castle 

 Rock. Mountains, in the Transition Zone. 



6. Crepis neomexicana Woot. & Standi. Contr. U. S. Nat. Herb. 16: 176. 1913. 

 Type locality: Tularosa Creek, Socorro County, New Mexico. Type collected by 



Wooton, July 14, 1906. 

 Range: Known only from type locality. 



7. Crepis perplexans Rydb. Bull. Torrey Club 34: 134. 1905. 

 Type locality: Encampment, Carbon County, Wyoming. 

 Range: British America to New Mexico and Nebraska. 



New Mexico: Upper Pecos (Bartlett). Mountains, in the Transition Zone. 



142. MUTISIACEAE. 



Herbs or shrubs with alternate, simple, sessile or petiolate leaves and solitary, 

 corymbose, or paniculate heads of flowers surrounded by an involucre of more or less 

 imbricated bracts; heads homagamous or heterogamous ; corollas either regularly 

 5-cleft or bilabiate in the perfect flowers and simply ligulate in the fertile ray flowers; 

 anthers long-caudate; receptacle naked; style branches of the perfect flowers not 

 appendaged, mostly very short. 



KEY TO THE GENERA. 



Heads radiate; plants scapose 1. Chaptalia (p. 630). 



Heads not radiate; plants caulescent. 



Herbs; flowers white or pink 2. Perezia (p. 630). 



Shrub; flowers yellow 3. Trixis (p. 631). 



1. CHAPTALIA Vent. 



Scapose perennial herb with obovate or oblong leaves, pinnatirid at the base, and 

 solitary heads; involucre turbinate, of narrow appressed imbricated bracts, the outer 

 successively shorter; heads heterogamous, radiate; achenes oblong to fusiform, 

 5-nerved, with a filiform beak; pappus of soft capillary bristles. 



1. Chaptalia alsophila Greene, Leaflets 1: 158. 1905. 



Type locality: Black Range, New Mexico. Type collected by Metcalfe (no. 1454). 



Range: Mountains of southwestern New Mexico and southeastern Arizona. 



New Mexico: South Percha Creek; East Canyon. Transition Zone. 



It is questionable whether our plant might not well be referred to one of the Mexican 

 species. 



2. PEREZIA Lag. 



Perennial herbs with thick reticulate-veined sptnulose alternate sessile leaves and 

 solitary or corymbose heads of white or rose-colored flowers; involucre of thin bracts 

 imbricated in several series, the outer successively shorter; heads homogamous, all 

 the flowers with bilabiate corollas; receptacle flat, naked; achenes puberulent, elon- 

 gated, not rostrate; pappus of copious scabrous bristles. 



