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.
There is one annual species of this genus in cultivation, which is pretty well known. The characters are : involucral bracts numerous, in two or three series; receptacle bracteolate; achenes of the disk crowned with a pappus of three bristles, and those of the ray muricate or winged. A commemorative name.
1. S. procumbens. - A trailing glabrous much-branched plant, having ovate entire leaves and bright yellow flower-heads with a black centre. There is a double variety of recent acquisition. Native of Mexico.