210 THE POTOMAC OE YOUNGEli MESOZOIG FLORA. 



of the leaves, as in Figs. 5, G, being larger than others, as in Fig. 4. 

 Strange to say, these leaves, although so abundant at the bank near Brooke, 

 show not a single specimen at the 72d mile-post, only a few hundred feet 

 distant. 



BaIER0PSI8 DENTICULATA, Sp. nOV. 

 Plato XCIII, Fi-. 7. 



Stems of the leafy branches proportionally stout ; leafy branches and 

 leaves alternate ; leaves fan-shaped and wide in proportion to length, 

 divided to near the base into two principal laminae, and those a little higher 

 subdivided into two subordinate laciniaj wliicli repeatedly subdivide until 

 the ultimate lacinia; end in two linear subacute teeth of comparatively 

 great length; nerves repeatedly forking flabellately, so that the ultimate 

 branches end in the teeth. 



Locality : Fishing hut above Dutch Grap Canal. 



This plant is quite rare, and usually occurs in small fragments. 



BaIEKOPSIS DENTICULATA, Var. ANGUSTIFOLIA, Sp. nOV. 

 Plate XCII, Fig. 7. 



Leaves subopposite, narrowly fan-shaped to wedge-shaped, quite nar- 

 row in proportion to their width; leaves attached more obliquely than in 

 B. dcnticulata, but with the lacinise and nerves as in that species, the 

 laciniaj being fewer in number. 



Locality : Bank near Brooke ; very rare. 



The facies of this plant is different from that of Baieropsis denticulata. 



BaIEROPSIS LONGIFOLIA, Sp. UOV. 

 Plate XCI, Fig. 6. 



Leaves very long in proportion to their width, deeply cut into very 

 long and slender principal lacinipe, which are two in number and diverge 

 slightly ; these are subdivided several times into long and slender laciniae, 

 finally giving long narrowly strap-shaped ultimate lacinise which are 1°'™ 

 and under in width, the tips not seen ; arrangement of the leaves as given 

 in the generic character ; nerves rather indistinct, but as in B. pluri}Kirtita ; 

 the main stem quite .slender. 



