154 LEAFLETS. 



ViGuiERA CHENOPODiNA. Shrubby with rigid branches 

 tomentulose-puberulent when young : leaves about an inch 

 long, short-petioled, deltoid-ovate, very obtuse, entire, very 

 firm, only obscurely veiny, cinereous-tomentulose on both 

 faces : heads in a nearly naked subcorymbose panicle, or few 

 and quite corymbose : involucres % inch high, not strongly 

 imbricated, the few outer bracts oval-oblong and more or less 

 hoary, the inner glabrous, twice as long, linear-oblong, all 

 obtuse : rays few, rather broad and showy : achenes imma- 

 ture, biaristate or uniaristate, the intervening scales large, 

 lacerate-fimbriate at summit. 



Between Santo Domingo and Matancita, Lower California, 

 14 Nov., 1905, collected by E. W. Nelson and E. A. Goldman, 

 their No. 7277 as in U. S. Herb. Well marked by the small 

 entire obtuse chenopodiaceous foliage. 



PoROPHYLLUM juNCiFORME. Tall shrub with few long 

 erect reedy and monocephalous branches, these pale and 

 glaucous, stoutish and almost fluted rather than striate, the 

 leaves few, linear : heads ^/i inch high, subcylindric ; bracts 

 of involucre about 5, slightly dilated upwards, at summit 

 obtuse, superficially pale, the 3 or 4 pairs of oblong glandular 

 spots very conspicuous : achenes densely strigose-hispidulous. 



Mescal Mountains, Arizona, 24 May, 1890, M. E. Jones. 

 Remarkably distinct from P. gracile by its tall naked rigid and 

 not slender monocephalous branches. 



POROPHYLLUM Vaseyi. Wholly herbaceous, the low reedy 

 stems closely tufted, very glaucous and striate, 5 to 7 inches 

 high, parted at summit into 2 or 3 short monocephalous 

 branches ; leaves few, linear, short, scattered : heads hardly 

 y^ inch high ; involucre short, little exceeding half the length 

 of the flowers, very many-flowered and verging towards the 

 turbinate or subcampanulate, the 4 or 5 bracts oblong-linear, 

 very obtuse, pale, marked with about two pairs of long nar- 

 rowly linear glandular spots : achenes stiffly hirsute. 



