KNOWLTON: Fossit PLANTS FROM PorcuPINE Butre 707 
broadly rounded below to a cordate, very slightly unequal-sided 
base ; margin not well preserved but apparently coarsely toothed ; 
nervation palmate, strongly 5-ribbed from the base ; central or mid- 
rib strong, somewhat flexuose, with about 4 pairs of alternate 
strong secondaries, which arise at an angle of about 45°, arch 
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upward and produce a few apps the nae ee sidan 
i inal teeth : upper ar]; 
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h with from 7-9 secondary 
; ae on ably end in the teeth ; 
e others, arising nearly at a 
