DISTRIBUTION OF THE MOEE PROMINENT NATURAL ORDERS. 253 



six species. Five genera and ten species of this suborder occur within the limits of the 

 United States flora, and Chaptalea tomentosa inhabits the Atlantic side as far north as 

 Nortlr Carolina. The Inuloidese are represented by eight genera, none endemic, and 

 forty-five species, whereof thirty-five are endemic. Five of the genera extend beyond 

 America ; four have a wide range, and Gnaphalium is the largest with thirty species. 

 There remain the Cichoriaceae, Cynaroideae, and Anthemideaa, with an aggregate total 

 of sixteen genera, not one of which is endemic, and only seven are restricted to America. 

 The species number fifty-four, of which thirty-two are endemic, twenty others restricted 

 to America, and two have a wide range. 



A glance at the proportional distribution of the Composite in Mexico and Central 

 America is sufficient to convince one that not half of those of the southern districts are 

 known. The figures are :— North Mexico, 629 ; South Mexico, 977 ; Guatemala, 123 ; 

 Nicaragua, 103; Costa Rica, 101; and Panama, 73. With regard to genera it is 

 interesting to note that whereas 150 occur in North Mexico there are only 157 in 

 South Mexico, where there is a third more species. An examination of the Table 

 (p. 212) teaches us that twelve of the larger genera of Composite count, collectively, 

 634 species, whereof 551 are endemic. 



One more point of interest deserves a few lines, and that is the extension of genera 

 and species into other parts of America. It would carry us to too great a length to 

 attempt to distinguish which of these should be regarded as extensions into our terri- 

 tories. Of the Mexican genera of Composite 107 are also in western North America, 

 64 in eastern, 104 in South America, and 58 in the West Indies. The distribution of 

 the species indicates still more markedly the western connection. Thus 182 extend 

 into western North America against 38 into eastern; and 111 into South America 

 against 65 into the West Indies. Further, the southward and eastward extension of 

 species exhibits the following proportions :— both the West Indies and South America, 

 38 species; West Indies only, 20 species; western South America only, 46 species; 

 eastern South America only, 12 species ; eastern and western South America, but not 

 the West Indies, 14 species. The proportion of species extending to the West Indies 

 is small, and there the Composite form a comparatively small proportion of the 

 vegetation. 



Campanulacece. 

 These are tolerably numerous, but they are mostly members of genera having a 

 greater concentration elsewhere. Thus the characteristic Andine Burmeisteria, Centro- 

 pogon,tmd Siphocampylus are represented by a few species; one species of the Cali- 

 fornian genus Nemadadus extends into Northern Mexico; and the widely-spread 

 Campanula rotundifolia is found in North Mexico, the southern limit of the genus in 

 America. Eeterotoma is a curious endemic genus ; and Lobelia counts about thirty 

 species, or nearly half the total of the order. 



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