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.
Frutescent or herbaceous plants, often glutinous. Flower-heads solitary, terminal, yellow. Pappus composed of 2 to 8 narrow deciduous bristles. About a dozen species are known. The genus was named in honour of a German botanist. The species are all American and rather tender.
1. G. grandiflora. - An erect biennial species a yard or more high, branching near the top. Radical leaves spathulate; cauline sessile, clasping, dentate. Flower-heads large, ray-florets orange. A native of Texas, flowering all the Summer.
0. squarrbsa is a dwarfer species with sharply-toothed leaves and single-headed flowering stems; and G. inuloides is an evergreen dwarf species,