182 THE I'JLAXT WORLD. 



involucral scales, their tailless anthers and truneate styles. Their 

 pappus is wanting or reduced, and their leaves usually dissected. 



Achillaea millefolium L., Yarrow, is cosmopolitan, and was 

 found by Dusen at Magellan. AntJiemis cotula L., once con- 

 fined to the Old World, is now naturalized in America, and even 

 in Patagonia. {Chrysanthemum seems not to be in S. America, 

 nor Matricaria, nor Tanacetum.) Artemisia runs down the 

 Andes, and a species, A. rnagellanica Sch. Bip., is in Patagonia 

 and on the steppes of Fuegia. Two genera, Cotula and Ahro- 

 tanella (both with 4-merous flowers), by their different species 

 connect Patagonia with Australia, Tasmania, New Zealand and 

 Chatham Island; the former also with Tristan, and the latter 

 with Auckland Island and Campbell Island. 



The Senecionea' come next to the Asterea^ for number of 

 species, and yet few of them are widely distributed, no species 

 being common, apparently, to the Old and New Worlds. They 

 have also varying habits, some being frutescent or arborescent, 

 and even the herbs being usually erect and not, as many Asterese, 

 with rosetted leaves. Like the Asterese, they have a setose pap- 

 ]3us, and naked receptacle. But the involucral scales are only 

 2-seriate (o-seriate in Culcitium), and subequal, often with a 

 calyculus. The anthers are basiobtuse, and the style brandies 

 truncate. Among genera with tailless anthers they are distin- 

 guished from Vernonias and Eupatoriums by their yellow disks, 

 and often heterogamous heads, and from the Asterea? by their 

 involucres and non-appendaged styles, and by their hibit. 



Senecio, Groundsel, is one of the largest genera, having 

 1,200 species. It is represented by 88 species in Patagonia, usu- 

 ally with 5-l()-ribbed achenes and copious pappus. Senecio 

 Johnstoni Oliv., of South Africa, is a tree, while *S'. liuniillimus 

 Sch. Bip., of the Andes, is a cespitose shrub. The Patagonion 

 sjjecies are analysable by the inflorescence (heads solitary or 1-3- 

 corymbed, or f e w-cory mbed , or many-corymbed, others panicled), 

 by the heads (discoid or radiate), by the shape of the leaves (web- 

 by or woolly (U* glabrous) and their margin, and liy their herba- 



