Tweedia – Tweedia caerulea (Oxypetalum caeruleum) Share this:Click to share on Pinterest (Opens in new window)Click to share on Facebook (Opens in new window)Click to share on Twitter (Opens in new window) Shop our Growers Choice Subscription! Shop Now Designed with love! Our Grower's Choice Subscription freshly picked and delivered to your door every month. Shop Now Common Name: Blue Star, Tweedia Botanical Name: Tweedia caerulea (Oxypetalum caeruleum), TWEE-dee-a se-RU-lee-a (ok-see-PET-a-lum ser-ROO-lee-um) Flower Color: Blue, Green Availability: Fall, Summer Tidbits: From the Greek “oxys” (sharp) and “petalum” (a petal), referring to the pointed petals of the flower. The specific epithet name “caerulea” means dark-blue, in reference to its flower color.