background branching brittle brown connected dead dried leaves lines patterns textures veins Australian coral tree brittle branches color colored colorful colors colour coloured colourful colours curved petals deciduous dicotyledonous erythrina erythrina x sykesii fabaceae finger-like flora flowers hardy hybrid invasive long petals non-seeding perennial pest scarlet flowers sterile hybrid tall tree thorny tolerant tri-foliolate tubular petals upward-pointing radial pattern vigorous vigorously growing tree weed