874 PATAGONIAN EXPEDITIONS I BOTANY. 



i. TRICHOCLINE HETEROPHYLLA Less. 



Leaves glabrous or laxly villous, long-petioled, oblong, entire or pin- 

 natifid. Involucral inner scales obtuse or acute, their margins scarcely 

 scarious, not undulate. 



(Brazil; very common about Bahia Blanca, called "Chucho," but the 

 true Chucho is solanaceous) ; probably in N. Patagon. 



2. T. INCANA Cass. 



Stem leafy ; its base densely woolly ; the leaves snowy-tomentose 

 underneath, entire, or mostly pinnatifid, their segments subentire. In- 

 volucral scales lanceolate, white-woolly below, acuminate, subequal. 



(Fig. in Eng. & Prantl, iv, 5, p. 341, G, H.) 



(S. Brazil; Argent.); N. Patagon., near Rio Negro. 



72. CHAPTALIA Vent. 



Mostly stemless herbs from a perennial caudex. Leaves snowy under- 

 neath. Scapes i -headed, leafless, but often with bracts under the radiati- 

 form head. Invohicral scales several-seriate, imbricate, narrow, acu- 

 minate, smaller outwards. Outer flowers ligulate, fertile ; inner 

 short-filiform; innermost bilabiate. Anthers tailed. Style-branches 

 obtuse. Achenes narrowing upwards to a rostrum. Pappus-setcz copi- 

 ous, barbellate. 



(Fig. in Eng. & Prantl, iv, 5, p. 341, J-N.) 



Species 21, Mex. and W. Indies to Argentina. 



C. INTEGRIFOLIA (Cass. sub Leria.] 



Leaves elliptic-oblong or lanceolate, entire or with a few spinulose 

 teeth, white-tomentose underneath. Scape 30-45 cm. high; head at 

 length nodding. Involucral scales linear, apically subulate. AcJienes 

 angled, minute, puberulous, 4 times shorter than the rostrum. 



(Brazil); N. Patagon. 



73. MACRACH^ENIUM Hook. f. 



More or less woolly herb, almost stemless, with tall, slender, i -headed 

 scape, and runcinate-pinnatifid leaves. Heads homogamous ; corollas 

 bilabiate. Involucre narrowly campanulate, its scales few-seriate, imbri- 



