132 PROCEEDINGS OF THE AMERICAN ACADEMY 



genus is the representative, on the plains of Buenos Ayres, &c., of 

 Gaillardia and Agassizia in the equivalent region of North America ; 

 and the three genera are very closely related. The style of the Gun- 

 theria is intermediate between that of these two related genera, from 

 both of which it recedes in the want of rays, and of an involucellate 

 coma around the achenia. 



Var. scABiosoiDES : foliis pinnati- vel sub-bipinnati-partitis. C. sca- 

 biosoides, Arn. in DC. 



RAILLARDIA, Gaud. — Although the rays of the pappus are 

 setae instead of paleae, the true place of this genus is next to Dubautia, 

 among the Hchniece. It differs from Duhautia chiefly in the slender 

 and truly plumose setai of the papus, the absence of chaff to the recep- 

 tacle (which is convex or obtusely conical and pubescent) and in the 

 nearly valvately uniserial involucre, the scales of which connive or 

 lightly cohere into a cylindrical cup. These two genera, with Argyro- 

 xiphium and Wilkesia (a connecting link between Argyroxiphium and 

 Duhautia) are the striking, characteristic, and wholly peculiar shrubby 

 or arborescent Compositce of the Sandwich Islands, especially of their 

 high mountain region or elevated lava plains. The present collection 

 contains specimens of the four published species of Raillardia, in such 

 perfection and variety as to enable me to characterize them properly, 

 and also five others. Some of these are so polymorphous — after 

 the fashion of the cbai'acteristic plants of those Islands — that, at the 

 first view of the collection, one would be disposed to double the number 

 of species here admitted. The species now known may be arranged as 

 follows, under three sections ; of which the third, by its nervose leaves 

 and more numerous flowers in the capitula, most approaches the 

 genus Duhautia. 



§ 1. Venoso-reiictdatce. 



1. Raillardia latifolia (sp. nov.) : foliis oppositis planis ampHs 

 oblongis penninerviis reticulato-venulosis dissitis subpetiolatis cum ramis 

 elongatis patentibus glaberrimis ; capitulis 4 - 5-floris numerosissimis in 

 panicula nuda composita effusa. — Island of Kauai. A rambling 

 shrub. 



§ 2. UninervicB, avenice. 



2. Raillardia scabra (DC): humilis ; caulibus floridis (^-2- 

 ped.) gracilibus superne parce foliatis fere herbaceis e basi decumbente 

 fruticosa ramosa; foliis plerisque altemis linearibus uninerviis supra vel 



