. ▁Each ▁leaf ▁has ▁a ▁ret use ▁or ▁trunc ate ▁a pe x . ▁It ▁res emb les ▁G aster ia ▁dist icha ▁and ▁G aster ia ▁bra chy ph yl la , ▁but ▁can ▁be ▁distinguished ▁by ▁the ▁presence ▁of ▁t uber cles ▁on ▁its ▁und ulate - m arg ined ▁leaves . ▁Sometimes ▁considered ▁a ▁separate ▁species , ▁G aster ia ▁ret usa . ▁ ▁G . ▁car in ata ▁var . ▁th un berg ii : ▁( from ▁Her berts dale ▁and ▁along ▁the ▁G our itz ▁river ) ▁Le aves ▁dist ich ous , ▁but ▁thin , ▁u pr ight , ▁pointed ▁( not ▁ret use ), ▁often ▁deeply - chan ne led ▁leaves ▁and ▁with ▁t uber cles ▁arranged ▁in ▁distinct ive ▁trans verse ▁lines . ▁Sometimes ▁considered ▁a ▁separate ▁species , ▁G aster ia ▁th un berg ii . ▁▁ ▁G . ▁car in ata ▁var . ▁ver ru c osa : ▁( lower ▁Bre ede ▁river ▁and ▁its ▁trib ut aries , ▁as ▁far ▁north ▁as ▁near ▁Heidel berg , ▁as ▁well ▁as ▁lim est ones ▁on ▁the ▁southern ▁coast ) ▁Le aves ▁dist ich ous , ▁u pr ight , ▁pointed ▁( not ▁ret use ) ▁and ▁with ▁dense ▁white ▁t uber cles ▁not ▁in ▁trans verse ▁arrangement . ▁ ▁Und efined ▁forms ▁ ▁" M el kb os " ▁is ▁a ▁large , ▁tub erc led ▁form ▁▁ ▁" K y ko ed ie " ▁is ▁a ▁small , ▁compact , ▁tub erc led