866 



PATAGONIAN EXPEDITIONS I BOTANY. 



nally. Low, annual herbs, with small, linear leaves which often have 

 minute, paired, axillary spines. 

 Species 4, in Chili and Argentina. 



DONIOPHYTON ARGENTEUM Speg. 



" Differs from Chuquiraga anomala Don. and C. Patagonica Phil, by 

 its axillary spines being always in pairs, distinct enough." 

 S. Patagon., by Rio Sta. Cruz and Rio Gallegos. 



63. DUSENIA O. Hoffmann. 



Low, annual herb, branching from the base, with linear-oblong, sessile 

 leaves, the lower opposite, the upper alternate. Heads homogamous, of 

 mid-size, disciform, solitary and sessile on the ends of the branches. 

 Involucral scales many-seriate, imbricate, the outer mucronate, the inner 



long-acuminate. Receptacle slightly con- 

 vex, naked. Corollas tubular, scarcely en- 

 larged above, regular, 5-cleft. Anthers\\\\h 

 connate tails. Style-branches short, not 

 hairy. Achenes turbinate, silky. Pappiis 

 of 10 acuminate, 2-seriate pales. 



(Near to Gochnatia, differing by the 

 pappus.) 



Species i, viz: 



FIG. 105. 



D. PATAGONICA O. Hoff. 



About 7 cm. high. Leaves obtuse, fleshy; 

 the upper webby. Flowers shorter than 

 the involucre, yellow. (Fig- 105.) 



N. Patagon., at Rawson, near the mouth 

 of the Rio Chubut (Dusen). 



64. GOCHNATIA H. B. & K. 



Dusema patagomca Plant slightly 

 reduced; also a single flower, with outer TomentOSC Or glabrOUS and glutinOUS 



and inner invoiucrai scales, enlarged, shrubs, with alternate, coriaceous, entire 



leaves, mostly tomentose underneath and 



rather small ; heads sessile crowded at the ends of the branches, or panicled, 

 discoid, yellow. Involucre scales many-seriate, imbricate, ovate-lanceolate, 



