6 Mr. J. Ball on the genus Leontodon. 



form in more than one of the characters above denoted, two or 

 more letters with the appropriate symbol are affixed. The use of 

 Greek letters is reserved for those forms which I would denomi- 

 nate lusus. 



I proceed to give diagnostic characters for the species and 

 the more remarkable subspecies and varieties with which I am 

 acquainted, subjoining occasionally critical observations derived 

 from notes made in the course of an examination of the speci- 

 mens contained in my herbarium. Such further information is 

 added with respect to the distribution and synonymy of each 

 species as appeared to rest on trustworthy authority. 



Leontodon, L. Involucrum imbricatum. iichenium columnare, 

 saepius in rostrum sensim attenuatum. Pappus conformis, per- 

 sistans, plumosus, radiis exterioribus interdum brevioribus eplu- 

 mosis. Plumulse radiorum fere semper persistentes. Receptaculum 

 subnudum. 



Sect. I. Oporina. Radix prsemorsa. Pappi radii subsequales, 

 omnes plumosi, ad basin dilatati serrulati. Capitula virginea erecta. 

 Pili simplices. 



1. L. autu7nnalis, L. Radice undique fibrosa; scapo diviso ; foliis 

 lineari-lanceolatis, vix acutis ; peduneulis superne incrassatis, squa- 

 mosis ; acheniorum suberostrium costae rugulosse. 



A. foliis pinnatifido- den tatis, lobis integris, subobtusis, linearibus ; 

 herba tota pilis simplicibus adspersa. 



Hah. in graminosis Europse prsesertim septentrionalis frequens. 

 Nascitur etiam in America boreali, dubitant tamen ell. Torrey et 

 Gray an vere indigenus. 



A + f. var. pratensis, foliis pinnatifido-dentatis ; involucre fusco- 

 villoso ; scapo foliisque pilosis. 



Hab. sparsim in pratis humidis. (Habui a Scavaic/, Isle of SAye, 

 Prof. Balfour ; legi prope Cracoviam, et in montibus prope Am- 

 bleside, in Anglise Comitatu Westmoreland.) 



Syn. Ajpargia pratensis, Link. 



•— I, — d^-f-g. ^'y\h's^. palustris, scapo subsimplici; foliis subinte- 

 gerrimis, obsolete dentatis, glabris ; capitulis parvis, in pedun- 

 culum attenuatis ; involucri squamis glabris, atrovirentibus. 



Hab. in paludosis, tarn montanis quam maritimis. (Legi in Anglia, 

 Westmoreland Mountains ; Black Mountains, Breconshire ; et 

 in Hibernia, Salt marsh by the Boijne near Brogheda.) 



+ r^— D, — I. subsp. boreal is, scapo simplici, foliis subinteger- 



rimis, obsolete dentatis ; involucro fusco-villoso. 

 Hab. in torfosis subalpinis Europse septentrionalis. (Clova Moun- 

 tains. Prof. Graham et Prof. Balfour ; Sutherland, Prof. Bal- 

 four ; legi in Hibernise monte Lugtiaquilla et in Scotise montibus 

 Grampians.) 



Sv^n. Hieracium Taraxaci., L. Apargia Taroxaci, Sm. 



