bird birds bloom blossom blue branch bud coral tree erythrina Erythrina abyssinica fly red red hot poker tree sky spring tree aspire background flowering happiness life motivate park Australian coral tree brittle branches color colored colorful colors colour coloured colourful colours curved petals deciduous dicotyledonous 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