BETULA 



253 



singly, erect, oblong, about 1 cm. long; pistillate catkins ending short 

 leafy shoots, 5-8 mm. long; fruiting catkins oblong-cylindric, erect, 

 pedicelled, 8-25 mm. long, 6-8 mm. in diameter, scales about 4 mm. long, 

 lateral lobes spreading, slightly shorter than the middle one, puberulent 

 or ciliolate; samara cordate, 2.5-3 mm. broad, nutlet slightly broader 

 than its wings : p u m i 1 a, dwarf. 



