og on um ▁( s ometimes ▁R hip og on um ) ▁is ▁a ▁genus ▁of ▁flow ering ▁plants ▁conf ined ▁to ▁eastern ▁Australia , ▁New ▁Zealand , ▁and ▁New ▁Guinea . ▁Until ▁recently ▁this ▁genus ▁was ▁included ▁in ▁the ▁family ▁Sm il ac aceae , ▁and ▁earlier ▁in ▁the ▁family ▁L ilia ceae , ▁but ▁it ▁has ▁now ▁been ▁separated ▁as ▁its ▁own ▁family ▁R ip og on aceae ▁( s ometimes ▁R hip og on aceae ). ▁ ▁Like ▁most ▁species ▁of ▁the ▁closely ▁related ▁Sm il ac aceae , ▁most ▁species ▁of ▁R ip og on um ▁are ▁wo ody ▁v ines . ▁D iffer ences ▁from ▁Sm il ac aceae ▁include ▁that ▁R ip og on um ▁la cks ▁st ip ules , ▁it ▁has ▁a ▁wet ▁rather ▁than ▁dry ▁st igma , ▁its ▁se eds ▁and ▁leaves ▁contain ▁st arch , ▁and ▁its ▁guard ▁cells ▁contain ▁oil . ▁ ▁Description ▁ ▁The ▁six ▁species ▁of ▁R ip og on um ▁are ▁per enn ial s , ▁either ▁v ines ▁or ▁shr ubs . ▁The ▁leaves , ▁which ▁may ▁have ▁several ▁different ▁arrang ements , ▁lack ▁st ip ules . ▁The ▁st ems ▁may ▁have ▁pr ick les . ▁The ▁Australian ▁species ▁are ▁bis ex ual ; ▁others ▁are ▁un is ex ual . ▁Ind ividual ▁flowers ▁have ▁six ▁white ▁to ▁pale ▁green ▁or ▁yellow ▁te p als . ▁The ▁ov ary ▁has ▁three ▁loc ules ▁with ▁two ▁ov ules ▁per ▁loc ule . ▁The ▁fruit ▁is ▁a ▁ber