Fecent Progress and present State of Systematic Botany. 358 
“Taking the species, therefore, in the Linnean sense, we 
would, with Alph. de ae eT the number of Phzno- 
gams now published, or in the course of publication, from ma- 
terials already in our herbaria, et Seneca 110,000 and 120,000. 
en 
The core which rises is, whether several or indeed any 
botanists can be found in our da capable of turning off good 
work at anything like Mr. Bentham’s rate, and so exceptionably 
well situated in respect to me and libraries, and in the 
command of their time. Eas the work may seem, the 
number of botanists who are ie to elaborate a genus and 
draw up fairly good botanical descriptions is wonderfully small. 
aa ~ bang either sgh extinct or from still surviving forms, i that 
a great number of the intermediate stages (races) fo 
ported te the pa meg differentiation of the extinct species, or in the course of the 
18661 nsfo =. tion of one yet living species into the diverging forms.”—Sitzwngsber., 
. 1866, i, 330, 
‘a recthaite uent paper he shows that the win anne Hieracium affords instances of 
great diversity in the degree to which differentiation has attained and in the defi- 
— of the species established by the extinction of intermediates. He in- 
amongst those to which he would in their present state assign the rank of 
1. scene forms, such as H. Pilosella, w: yas cannot as yet be separated 
into distinct one i. Hoppean: um, Schul tt, J ollaferionem, mee H. Pseudo- 
as species. 
" ‘orms whieh, by the disappearance of closely allied ones, have et 
sharper and more fixed limits, and yet between which isolated intermediates 
: Hh heck 
still be found, are exemplified uricula, H. awrantiacum H. Pilosella, or 
by A. murorum ai and H. glaucum. On the hand, it is uncertain 
ther the relations of H. Auricula H. glaciale, or vul- 
neluded in tage, or are still in the first-me is 
een which no constant intermediates survive, but which still are 
capable of of producing inte hybrids, are represented by and H. 
alpinum H. Tania b rorum and 
4, i y, the three sectio J rehier' n 
which become so far-distanced from se ge recy ne fertilization no longer 
takes place between them.—Sitzungsb., 1866 
