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Winged euonymous' younger stems and branches have geen bark and 2-4 cork-like "wings" (thin plates whose plane lies in a radius of the branch). Clusters of 1-3 flowers arise from leaf axils; individual flowers are about 1/3" (8 mm) across with four green sepals, four yellowish-green petals, four stamens, and a green central dome which bears the single pistil with a reddish, multilobed stigma. Four-lobed seed capsules become dark red or purple at maturity; they split to expose 1-4 reddish-orange arils.

Euonymus

Euonymus alatus

winged Euonymus [Blooms: May-Jun]

European spindletree flowers (usually less than 7) occur in clusters (cymes) with long peduncles; they have four sepals, four petals, four stamens with white anthers, and a single stout style. The greenish-white or yellow petals on the flowers appear to be very narrow, half the width of the petals of Hamilton's spindletree. (In reality, the petals are curled into a U-shape towards the stem so they only appear narrow.) The sepals are pale green, about half the length of the petals, and bent back beneath the flower. The fruit is pink, not red; the arils covering the seeds are orange, not red or scarlet. European spindletree blooms later in the spring in Jackson Park than Hamilton's spindletree.

Euonymus

Euonymus europaeus

European spindletree [Blooms: Apr-Jun]

Hamilton's spindletree produces clusters of about seven flowers on ~1.5" peduncles that grow out of the leaf axils. Individual flowers are <1/2" across with four white, elongate-oval petals with rounded tips, four stamens with dark purple (approaching black) anthers, and a large green ovary with a single, stout green style. The fruit is a four chambered, deeply-grooved, rose-colored capsule ~1/2" across containing four scarlet, fleshy arils, each surrounding an ellipsoidal, dark brown seed.

Euonymus

Euonymus hamiltonianus

Hamilton's spindletree [Blooms: Maay-Jun]