▁a ▁larger ▁amount ▁of ▁res in ▁than ▁the ▁ha p lo x yl on ▁p ines . ▁The ▁current ▁division ▁into ▁two ▁sub gener a ▁( P inus ▁and ▁St ro bus ) ▁is ▁supported ▁with ▁rig orous ▁gen etic ▁evidence . ▁ ▁Several ▁features ▁are ▁used ▁to ▁distinguish ▁the ▁sub gener a , ▁sections , ▁and ▁sub sections ▁of ▁p ines : ▁the ▁number ▁of ▁leaves ▁( need les ) ▁per ▁fasc icle , ▁whether ▁the ▁fasc icle ▁she ath s ▁are ▁decid uous ▁or ▁persistent , ▁the ▁number ▁of ▁fib ro vas cular ▁bund les ▁per ▁need le ▁( 2 ▁in ▁P inus ▁or ▁ 1 ▁in ▁St ro bus ), ▁the ▁position ▁of ▁the ▁res in ▁du ct s ▁in ▁the ▁need les ▁( internal ▁or ▁external ), ▁the ▁presence ▁or ▁shape ▁of ▁the ▁seed ▁wings ▁( abs ent , ▁rud iment ary , ▁art ic ulate , ▁and ▁ad n ate ), ▁and ▁the ▁position ▁of ▁the ▁um bo ▁( d ors al ▁or ▁terminal ) ▁and ▁presence ▁of ▁a ▁pr ick le ▁on ▁the ▁scales ▁of ▁the ▁seed ▁con es . ▁ ▁Sub gen us ▁P inus ▁▁ ▁Sub gen us ▁P inus ▁includes ▁the ▁yellow ▁and ▁hard ▁p ines . ▁P ines ▁in ▁this ▁sub gen us ▁have ▁one ▁to ▁five ▁need les ▁per ▁fasc icle ▁and ▁two ▁fib ro vas cular ▁bund les ▁per ▁need le , ▁and ▁the ▁fasc icle ▁she ath s ▁are ▁persistent , ▁except ▁in ▁P . ▁lei oph yl la ▁and