This section is from the book "Handbook Of Hardy Trees, Shrubs, And Herbaceous Plants", by W. Botting Hemsley. Also available from Amazon: Handbook of hardy trees, shrubs, and herbaceous plants.
A small genus of Asiatic herbs resembling the Thistles in their foliage. Flowers in dense clusters in the axils of the upper smaller leaves. Corolla-tube long, slender, curved; limb irregular. Stamens 4, didynamous, or united in pairs. Named in honour of a French botanist.
Cephalaria Tartdarica is an allied tall perennial bearing large heads of pale yellow flowers, in which the involucels exceed the florets.