March 31, 19* »9 49 



same as the one described there under the varietal name of hum- 

 Ms, but it at least fits the description very well. Dr. Gray con- 

 sidered his plant a depauperate form, hut our Arizona specimens 

 are certainly not depauperate. They differ from M. tanaceti- 

 folia in their less branched habit, that species branching copi- 

 ously from the base, less divided leaves, smaller heads, and more 

 foliaceous, broader, and not reflexed bracts. The plants are 

 without doubt specifically distinct from the species to which 

 they were referred. 



The type of var. humilis was collected near Ojo deGavilan, 

 New Mexico, by Wright. This is somewhere near the Arizona 

 border, and may even be in that Territory. Var. pygmaea was 

 collected on dry, stony hills, valley of the Calado, Chihuahua, 

 and near HI Paso, The collection at the former place was made 

 in August and at the latter in April. A description of the plant 

 is as follows: 



Annual: stems erect, about 3 dm. high or less, simple be- 

 low but corymbosely branched above from about the middle, 

 the branches strictly ascending, with a scattered pubescence 

 throughout consisting- of short and weak slender hairs: lower 

 leaves 5 cm. long or less, once pinnatifid, the lobes entire and 

 oblong, the terminal one oblong-obovate, sparingly puberulent; 

 upper leaves similar but reduced, the uppermost simple, linear 

 and bract-like: heads rather numerous, hemispherical, 10 mm. 

 high and 12 mm. wide or less: rays numerous, purple: involu- 

 cral bracts in several series, linear-lanceolate, acute, membran- 

 ous below and straw-colored, ciliolate and puberulent, the upper 

 half bright green, foliaceous, erect and not reflexed: achenes 

 small and covered with a dense, rather long, silky pubescence: 

 pappus hardly extending beyond the involucral bracts. 



Collected at Tucson, Arizona, on the University campus, 

 August 28, 1903, Tkornber 192. 



Herbarium of the New Mexico Agricultural College. 



