•
Cactus quadrangularis, the mistletoe cactus, a synonym name of
Rhipsalis baccifera •
Cassia quadrangularis, the arsenic bush, a synonym name of
Senna septemtrionalis (previously included in the genus
Cassia) •
Cicendia, quadrangularis, a species of plants in the gentian family •
Corryocactus quadrangularis, s species of plants in the cactus family •
Critonia quadrangularis, a species of plants in the sunflower family •
Cissus quadrangularis, a species of the grape family •
Dorstenia quadrangularis, a synonym name of
Dorstenia contrajerva, a species of the
mulberry family •
Erithalis quadrangularis, a species of the family Rubiaceae •
Euphorbia quadrangularis, a succulent species of the spurge family •
Gladiolus quadrangularis, a species of the iris family •
Melicope quadrangularis, four angle melicope or four-angled pelea, a species of the citrus family • '''', a species of the glory bush family •
Microstylis quadrangularis, a synonym name of
Malaxis excavata, a species of orchid •
Montanoa quadrangularis, a species of the sunflower tribe •
Myrtus quadrangularis, a synonym name of
Syzygium antisepticum •
Passiflora quadrangularis, giant granadilla, a species of the genus
Passiflora •
Peperomia quadrangularis, a species of the pepper family •
Phyllostachys quadrangularis, squares-stemmed bamboo, a species of bamboo •
Rhigospira quadrangularis, the sole species of the genus Rhigospira, in the dogbane family •
Sauropus quadrangularis, a species of the family Phyllanthaceae •
Smilax quadrangularis, a synonym name of
Smilax rotundifolia, roundleaf greenbrier • '''', a species of the
pipewort family •
Tarenna quadrangularis, a species of the family Rubiaceae •
Tillandsia quadrangularis, a synonym name of
Tillandsia juncea, a species of the pineapple family •
Tithymalus quadrangularis, a synonym name of
Euphorbia canariensis, Canary Island spurge ==
Animalia ==