18 MB. W. ABCHEE ON THE YALUE OF HAIES 



by those afforded by the other organs. The result will be found 

 in the " Conspectus " which concludes this paper. 



As to the question of the generic value of the character based upon 

 the uniserial or biserial pappus, it is necessary first to determine 

 the difference between the two, — a point which does not seem to 

 have been satisfactorily decided. In Eurybia and Olearia there 

 are two kinds of pappus, which appear at first sight equally bi- 

 serial, but which, nevertheless, are found upon close examination 

 to differ considerably. The one, which is styled "pappus duplex" 

 in the following " Conspectus," has two distinct rings of hairs — 

 the inner one composed of long, simple, scabrid bristles, and the 

 outer of short, rather wide, subserratulate ones, more or less con- 

 nate at the base. The other kind of pappus, which I have below 

 called "subduplex," consists of one ring of long, simple, scabrid 

 bristles, with a less and varying number of short ones of the same 

 description disposed irregularly on the outside of them, in some 

 measure alternating with them, and planted closely together with 

 them at the base, but not by any means forming a distinct ring. 

 It does not appear to differ, otherwise than in the shortness and 

 nearly equal length of the bristles, from what is below styled 

 "pappus inajqualis," the bristles of which are of very unequal 

 length. 



The following seven species have the pappus " duplex : " — 



Hairs of leaves stellate. 



Eurybia lirata (DC). Eurybia rugosa (Muell.). 



fulvida (Cass.). asterotricha (Muell.), 



• Gunniana (DC). 



Hairs of leaves divaricato-furcate. 

 Olearia rotundifolia (DC). Olearia dentata (Mimch.). 



■ The following thirteen species have " subduplex " pappus. 



Hairs of leaves T-formed. 



Eurybia dentata (Hook.Jil.). Olearia pannosa (Hook.). 

 Olearia insignis (Hook.fl). ? grandiflora (Hook. f I.). 



Hairs of leaves stellate. 

 Eurybia hygrophila (DC). 



Hairs of leaves woolly. 

 Olearia Colensoi (Hook.fil.). Olearia oporina (Hook, fi I.). 

 Lyallii (Hook, fi I.). angustifolia (Hook, fi I.). 



