Tweedia is known for its distinctive turquoise blue star-shaped flowers and green/grey felted leaves. If you are a gardener, who loves seeing a touch of blue in your flower bed, Tweedia caerulea is the perfect plant for you. Tweedia is known for its distinctive turquoise blue star-shaped flowers and green/grey felted leaves. Prior to being identified as Tweedia caerulea, tweedia belonged to the genus Oxypetalum meaning sharp petal. Its five-petaled flowers bloom in loose clusters, which give way to boat-shaped seedpods. The seedpods are characteristic for the plant family in which it belongs, Asclepiadaceae. In its native habitat of Uruguay and Brazil, tweedia is a tropical vine or subshrub.