▁is ▁in ▁the ▁form ▁of ▁vig orous ▁sp ur ▁sho ots ▁with ▁short ▁intern odes , ▁scale - like ▁leaves ▁on ▁the ▁lower ▁port ions ▁and ▁normal ▁fol i age ▁on ▁the ▁upper ▁port ions . ▁The ▁leaves , ▁which ▁are ▁bent ▁back ▁when ▁they ▁first ▁emer ge , ▁are ▁trif oli ate ▁and ▁marked ly ▁different ▁to ▁those ▁of ▁other ▁members ▁of ▁the ▁genus , ▁being ▁smooth ▁and ▁gl oss y , ▁thick , ▁st iff ▁and ▁le ath ery ▁in ▁texture , ▁with ▁in rolled ▁marg ins ▁on ▁the ▁unders ide . ▁The ▁tree ▁is ▁ever green , ▁because ▁the ▁sho ots ▁and ▁leaves ▁grow ▁before ▁the ▁old ▁fol i age ▁is ▁shed . ▁The ▁infl ores c ence ▁is ▁bor ne ▁in ▁the ▁ax il ▁of ▁a ▁scale ▁leaf . ▁Se par ate ▁male ▁and ▁female ▁flowers ▁are ▁present , ▁the ▁flowers ▁being ▁large , ▁with ▁marked ly ▁tw isted ▁cal y x ▁lo bes . ▁The ▁f ruits ▁are ▁green ▁with ▁re dd ish ▁tips ▁and ▁contain ▁three ▁large ▁hex ag onal ▁se eds , ▁meas uring ▁. ▁This ▁tree ▁is ▁not ▁used ▁commer cially ▁for ▁the ▁production ▁of ▁late x ▁having ▁a ▁poor ▁reputation ▁due ▁to ▁the ▁high ▁proportion ▁of ▁res ins ▁present . ▁ ▁Distribution ▁and ▁habitat ▁H . ▁rig id ifolia ▁is ▁en demic ▁to ▁the ▁upper ▁reaches ▁of ▁the ▁Rio ▁Neg ro ▁and ▁the ▁V au p és ▁River ▁in ▁the ▁northern ▁part ▁of ▁the ▁Amazon ▁bas in , ▁near ▁the ▁boundary ▁between ▁Brazil ,