aquilegia Columbine cultivar elegant flowers garden long perennial petals spurred spurs yellow dainty flower natural nature plants stamens flowerhead anthers background clusters exotic filaments flora foliage green leaves purple Singapore stamen tips tropical unusual whiskers-like white bright Caesalpinia cheerful china colourful delicate different extraordinary extravagant extrovert flamboyant graceful orange petal plant red showy strange Australian coral tree brittle branches color colored colorful colors colour coloured colours curved petals deciduous dicotyledonous erythrina erythrina x sykesii fabaceae finger-like hardy hybrid invasive long petals non-seeding pest scarlet flowers sterile hybrid tall tree thorny tolerant tri-foliolate tubular petals upward-pointing radial pattern vigorous vigorously growing tree weed