At the center is a spherical cluster of green pistils.

This develops into a spherical cluster of green fruits.

The fruit is an achene borne in a spherical cluster of 18 or more.

The fruit is an achene borne in a spherical cluster of usually 10 to 20.

The flowers are yellow, and held in spherical clusters.

The inflorescence is a series of spherical clusters of flowers.

The fruit is an achene borne in a spherical cluster of up to 35.

The fruit is an achene borne in a spherical cluster.

The inflorescence is a heavy spherical cluster of flowers.

Something in the plane of the galaxy, for the shielding effect, maybe a spherical cluster.