Philodendron crassinerviumPhilodendron crassinervium at a glance: Philodendron crassinervium is a strap leaf philodendron best known for its long, narrow blades and the thick swollen midrib that functions as a water storage organ. Small red glands along that midrib add another detail, giving the leaves a slightly freckled look that becomes more obvious at close range. The plant can creep or climb depending on how it is grown, which makes it more flexible than its clean outline