Acer opalus Mill. subsp. granatense (Boiss.) Font Quer & Rothm.
Family: ACERACEAE
Genus: Acer
Sinònims: Acer granatense Boiss.
Catalan common name: Rotaboc.
Spanish common name: Ácer. Acirón. Arce de España.
Province distribution: Alacant. Balearic Islands. Castelló. Girona. Lleida. Tarragona. València.
Distribution in the islands: Mallorca.
General distribution (Phytogeography): Mediterranean
Plants protected by law: Balearic Catalogue.
IUCN Category: Least concern
Flowering time: JanFebMarAprMayJunJulAugSepOctNovDec
Life-forms: Macrophanerophyte.
Habitats: Mountainous oakforest. Rock crevices and cliff faces. Quercus faginea oak wood. Rock creviceses and rock walls.
Characteristics: This is a deciduous tree which lives in the shady areas of the Serra de Tramuntana mountain range, generally rooted in the cracks in crevices in cliff faces. It is a relic of the vegetation belonging to a more humid climate than the actual one. The fruits are very characteristic, they are found in pairs and each has a large membranous wing (samara); Fraxinus angustifolia, which is also a deciduous tree, has a winged fruit, but in this case it is solitary rather than paired.