22 LEAFLETS. 



branches of the lax inflorescence, so tortuous as to suggest 

 almost a reclining if not half -prehensile mode of growth. 



Senecio Encelia. Perennial, a foot high ; leaves many, 

 in a basal tuft and short-petioled ; almost all parts of the 

 plant white with a dense pannose tomentum, or this some- 

 what flocculent on the stem : lowest leaves suborbicular to 

 oval and small Y^-yi inch long, toothed across the obtuse 

 summit, the others ovate and lance-ovate, entire, acutish, 

 1/^-3 inches long including the short petiole, all of rather 

 firm texture, only the lowest and oldest glabrate above, 

 cauline reduced to few lanceolate sessile bracts : heads of 

 middle size, in a compact and compound fastigiate corymb ; 

 bracts of involucre lance-linear, glabrous except at base : rays 

 oblong, acutely 3-toothed : pappus fragile ; achenes glabrous. 



Pinal Mountains, southern Arizona, 26 May, 1890, Marcus 

 E. Jones. Specimen on sheet 220118, U. S. Herb. The foH- 

 age, in form as well as indument, recalls the most woolly 

 species of Encelia. 



GuTiERREziA LiNOiDES. Suffrutescent, very slender, 2 feet 

 high ; stems loosely leafy below, very loosely corymbose at 

 summit ; the very lowest leaves narrowly oblanceolate, the 

 others linear, mostly 1 Vz inches long, rather sparsely scabrous- 

 serrulate, the upper face also more or less scaberulous as well 

 as resinous-punctate, all the foliage of the main stems de- 

 flexed, that of the sterile twigs reduced in size and widely 

 spreading when not deflexed : involucres shortly subcylindric, 

 about 5-flowered, the rays 2 or 3 and rather conspicuous, those 

 of the disk about 2. 



Limestone slopes of the Chiricahui Mountains, J. C. Blumer, 

 1907. 



Pyrrocoma adsurgens. Stout, low, the several flowering 

 stems less than a foot high, assurgent from a strongly decum- 

 bent base, very sparingly villous-hirsute, the hairs deflexed : 

 basal leaves lance-oblong, 2 to 5 inches long, tapering to short 

 winged petioles, crisped along the edges, a very narrow margin 

 callous-whitened and scabrous-serrulate ; cauline leaves co- 

 pious, sessile, ascending, all the foliage glabrous : head soli- 



