pt os orus ▁n ests ▁within ▁As pl enium , ▁and ▁current ▁treat ments ▁do ▁not ▁recognize ▁it ▁as ▁a ▁separate ▁genus . ▁ ▁In ▁ 2 0 0 7 , ▁Brian ▁Ke ener ▁and ▁Lawrence ▁J . ▁D aven port ▁described ▁the ▁fert ile ▁Hav ana ▁Glen ▁population ▁as ▁a ▁separate ▁species , ▁As pl enium ▁tut w il era e . ▁They ▁argued ▁that ▁as ▁the ▁fert ile ▁population ▁is ▁sex ually ▁reprodu cing , ▁re product ively ▁isolated , ▁and ▁emer ged ▁from ▁a ▁common ▁origin ▁( in ▁contrast ▁to ▁A .   ×   eben o ides , ▁which ▁ar ises ▁through ▁independent ▁hy brid ization ▁events , ▁possibly ▁followed ▁by ▁veget ative ▁propag ation ), ▁it ▁is ▁consistent ▁with ▁several ▁well - accept ed ▁bi ological ▁species ▁concepts ▁and ▁is ▁deser ving ▁of ▁recognition . ▁ ▁Distribution ▁As pl enium ▁×   eben o ides ▁is ▁en demic ▁to ▁eastern ▁North ▁America ▁from ▁Alabama ▁in ▁the ▁south ▁to ▁New ▁Ham pshire ▁in ▁the ▁north ▁and ▁Missouri ▁and ▁Ark ansas ▁in ▁the ▁west . ▁Its ▁distribution ▁is ▁scattered , ▁running ▁along ▁the ▁App al ach ian ▁Mountains ▁and ▁P ied mont ▁and ▁down ▁the ▁Ohio ▁Valley ▁into ▁the ▁O z ark ▁Mountains , ▁although ▁it ▁has ▁also ▁been ▁found ▁on ▁the ▁Coast al ▁P lain ▁of ▁Virginia . ▁All ▁occurr ences ▁fall ▁within ▁the ▁overlap ▁of ▁the ▁two ▁parent al ▁ranges , ▁although ▁A .   ×   eben o ides ▁is ▁not ▁known ▁to ▁extend ▁as ▁far ▁north