222 ME. J. BALL ON THE FLOEA OF NOBTH PATAGONIA. 



elsewhere (No. 200, G. 0.). A email fragment, too imperfect to 

 be named. 



Achtbocline SA.TUBEIOIDES, DC. Sierra de Tandil ; flower- 

 ing in autumn, end of March (No. 120, G. C). It is somewhat 

 remarkable to find this species, widely spread throughout tropical 

 South America, extending so far south under very diiferent 

 climatal conditions. Neither from dried specimens nor from the 

 description (DC. Prod. vi. p. 220) can I see any note of dis- 

 tinction between this and A.flaccicla, DC. 



Gnaphalittm luteo-album, L. Bahia Blanca and North 

 Patagonia (No. 63, G. C). It is rather remarkable that this cos- 

 mopolitan weed, which is found almost everywhere else in South 

 America, is not mentioned in Grisebach's enumeration of the very 

 full collections made by the late Prof. Lorentz and others in the 

 Argentine territory. It is not included by Berg in his list of 

 plants introduced about Buenos Ayres, perhaps because he con- 

 sidered it indigenous. 



Gnaphalittm amebicanum, Mill., = G. spicatum, Lam. About 

 Aj6 (No. 168, G. C). 



Ambbosia abtejiislefolia, L. ; var. foliorum segmentis an- 

 gustis lanceolato-linearilus. Common at Ajo, and extends 

 throughout the province of Buenos Ayres (No. 173, G. C). This 

 plant is said to give a disagreeable taste to the flesh of cattle 

 feeding on it. It has no Indian name. Perhaps an introduced 

 species. 



Xanthium ambbosioides, Hook. Sf Am. South of the pro- 

 vince of Buenos Ayres, very common about the bizcacheros(No. 53, 

 G. C). Unlike the other Xanthia, this very distinct species 

 is confined to temperate South America; but its area appears to 

 be extending, it being doubtless transported by animals, to whose 

 hair or fur the fruit adheres. M. Claraz informs me that in his 

 district the plant has been seen only of late years, and was not 

 found anywhere in that region by Professor Lorentz in his earlier 

 excursions to the south of Buenos Ayres. 



Vebbesina afstbalis, Baler, =Ximenesia microptera, DC. 

 Bahia Blanca. A weed which seems to follow the colonists 

 (No. 43, G. C). 



Spilanthes belen iobes, Hook. $ Am. Prom Bahia Blanca 



