170 LEAFLBTS. 



linear-pjnnatisect, but most commonly consisting of a linear 

 rachis with "Z or 3 mere teeth or short lobes on either 

 side, all hirtellous-ronghened : bracts of the involucre pale 

 straw-color with greenish tips, these often bearing a gland : 

 achenes short, densely silky ; pappus copious. 



Mesas about Tucson, Arizona, collected by Smart, 1867, by 

 Pringle, 1884, and by Touaiey, Neally and others at more recent 

 dates. 



I. EusBYi. Branches a foot high, slender, glabrous, corymbose 

 at summit: leaves IJ to 2 inches long, ascending, narrowly 

 linear, entire, obtusish, glabrous, 1-nerved : involucres broad, 

 subcampanulate, the bracts in few series, oblong-lanceolate, 

 acutish, glabrous, not glutinous, but acutish, tips green and 

 pulverulent : achenes not seen. 



Holbrook, northern Arizona, 20 Aug., 1883, H. H. Rusby. 



I. PEDICELLATA. Shrub 8 to 12 inches high with many very 

 slender upright branches glabrous, visoidulous, at summit fas- 

 tigiate-corymbose : leaves very small, linear- oblanceolate, glab- 

 rous, viscid, nerveless, buUate-rugulose : involucres one or several 

 at the end of each filiform and elongated branch of the inflor- 

 escence, small, turbinate, their bracts in many series, oblong, 

 obtuse, green and glandiferous at tip : achenes not seen. 



Southwestern Te^as, Edw. Palmer, 1879 or 1880, special 

 locality not noted on label, the species most distinct from all 

 others. 



I. BRACTEOSA. Stout, apparently only snfllrutescent, but 2 

 feet high, with many loosely fastigiate long branches all very 

 sparsely hispidulous : leaves small for the plant, oblong-oblan- 

 ceolate, entire or vvith a few spinulose-serrate teeth, those of the 

 flowering branches numerous but reduced to small sessile oblong 

 entire acute bracts : cymes mostly of few and pedicellate heads; 

 involucres turbinate, bracts much imbricated, Subquadrate 

 oblong, ending in an abrupt green tip thickened by a large 

 gland, and with a terminal spinescent cusp or mucro. 



Species strongly marked, but known only as collected in early 

 flower somewhere in Tulare Co., California, by C. S. Sheldon, 

 1899. 



