170 LEAFLETS. 
linear-piunatisect, but most commonly consisting of a linear 
rachis with 2 or 3 mere teeth or short lobes on either 
side, all hirtellous-roughened: 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 Toumey, Neally and others at more recent 
dates. 
I. Russyr. Branches a foot high, slender, glabrous, corymbose 
at summit: leaves 14 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, viscidulous, at summit fas- 
tigiate-corymbose: leaves very small, linear-oblanceolate, glab- 
rous, viscid, nerveless, bullate-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 Texas, Edw. Palmer, 1879 or 1880, special 
locality not noted on label, the species most distinct from all 
others. 
I. BRACTEOSA. Stout, apparently only suffrutescent, but 2 
feet high, with many loosely fastigiate long branches all very 
sparsely hispidulous: leaves small for the plant, oblong-oblan- 
ceolate, entire or with 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, 
