20 



PITTONIA, 



Volcanic rocky soil near the summit of Mt. San Francisco, 

 in the northern part of Arizona, 10 July, 1S89, Plentiful, 

 but scarcely yet in flower at the date of its discoyery. The 

 altitude, little less than 12,000 feet ; the only associate plant 

 being Polemonhim confertum, and that well past flowering. 



Senecio ionophyllus. Perennial, a foot high or taller, 

 somewhr\t floccose, or nearly glabrous : radical leares crowded, 

 somewhat fleshy, small (f inch long), cordate-orbicular or 

 eA'en slightly reniform, coarsely crenate or dentate, on petioles 

 2 inches long ; cauline narrower, more sharply toothed or 

 even somewhat pinnatifid : heads large (f inch high, -| inch 

 broad), solitary, or more frequently 3 to 5 in a lax terminal 

 corymb ; bracts oblong-lanceolate, the calyculate few, im- 

 bedded in white tomentum : rays showy, light yellow : style- 

 tips hirsute : achenes j^rismatic-fusiform. 



Dry pine woods near the summit of the mountains soutli of 

 Tehachapi, Kern Co., Calif., 25 June, 1889. A handsome 

 species, the nearest relative of which may be S. Greenei of 

 the Lake County hills. 



Senecio Gibbonsil Stem stout, simi^le, 3 feet high or 

 taller, leafy throughout : leaves rather fleshy, short-petioled, 

 3 inches long, deltoid-lanceolate, acute, entire, or with a few 

 irregular teeth near the base : heads radiate, | inch high, 

 disposed in a lax somewhat dichotomons cyme : involucre 

 campanulate, calyculate-bracted at base. «» 



Salt marshes at the mouth of the Columbia River. Dr. 

 William P. Gibbons, 1889. Tlie plant Las innch of the aspect 

 of the well known montane species, S. triancjidaris, but has a 

 different inflorescence, as well as fleshy entire leayes which, 

 from the dried specimen, appear to have had a closely revo- 

 lute margin. 



Layia hispida. a foot high or less, diffusely branched 

 from the base, rather densely hispidulous throughout, and 

 with a few small dark stipitate glands on the involucre : 



