As discussed in the next two paragraphs, Clarke and Merlin failed to distinguish the large stalked glandular hairs ("capitate glands") which predominate in the inflorescence from the much smaller but quite numerous small more or less stalkless glands which predominate on the foliage.
Distinguishing characteristics of Eggert's sunflower include opposite, stalkless, lance-shaped leaves that are rough and waxy on the upper leaf surfaces and white on the undersides.