902 PATAGONIAN EXPEDITIONS! BOTANY. 



panulate, its scales many-seriate, imbricated, smaller outwards. Recep- 

 tacle naked. Anthers basisagittate. Achenes flattish, io-2O-costate, 

 truncate. Pappus copious, white, capillary, usually deciduous together. 

 Species 5, of Old World. 



i. SONCHUS ASPER (L.) Allioni. 



Annual. Stem leafy below. Leaves undivided or pinnatifid, spinu- 

 lose-toothed ; the lower petiolate, the upper clasping, with rounded auri- 

 tles ; obovate to oblong or lanceolate. Achenes ribbed, but not trans- 

 versely wrinkled. 



Cosmopolitan. N. and S. Patagon. ; "naturalized and spread over 

 tropical and temperate South America ; probably to a great extent with- 

 out the agency of man." (J. Ball.) 







2. S. OLERACEUS Linn. Sow-thistle. 



Basal and lower leaves petioled, lyrate-pinnatifid, 10-25 cm. long, the 

 terminal segments usually large and triangular. Upper leaves pinnatifid, 

 with acute, clasping auricles. Achenes ribbed, and transversely wrinkled. 



Patagon. (M. & T.; by Hatcher on edge of a marsh, nearly a meter high, 

 in fruit March). A weed in cultivated lands of the Old World and N. 

 Amer. ; also naturalized in Patagon. and the Chonos Archip. 



83. AGOSERIS Raf. (Troximon Nutt, 1813, non Gaertn., 1791. 



Including Macrorhynchus Less.) 



Nearly stemless herbs, glabrous to sparsely pilose. Scapes erect, leaf- 

 less, i -headed. Heads midsize to large, liguliferous, mostly yellow- 

 Involucre campanulate, its scales many-seriate, the outer smaller. Recep- 

 tacle rarely with some chaff. Anthers basally acute or setaceous. Achenes 

 glabrous, lo-costate, contracted below, apically rostrate. Pappus setose, 

 copious. 



Species 25, in W. and S., of N. Amer., and Peraustral Amer. 



i. A. AUSTRALIS (Phil, sub Macrorhynchus}. 



Cespitose. Leaves arachnoid-hirsute, linear, usually pectinately pin- 

 natifid ; with linear segments and linear rachis. Scapes scarcely exceed- 

 ing the leaves, very densely woolly. Outer involucral scales hirsute, 

 triangular-lanceolate ; inner glabrous and longer, equalling the flowers. 



Magellan strait, near Punta Arenas ; Falklands. 



