umbrella tree noun6 •An umbrella magnolia (Magnolia tripetala). •An African corkwood (Musanga cecropioides). •An Australian rainforest tree (Polyscias murrayi). •An octopus tree (Schefflera actinophylla). •An Indian almond (Terminalia catappa). •An umbrella thorn (Vachellia tortilis). formsumbrella trees