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.
Herbs with the flowers in one-sided spikes. Corolla long, tubular, with 5 small nearly erect teeth at the top. Stamens 5. Style jointed near the middle. Fruit composed of two carpels, finally separating and bursting down the back, few-seeded. This is exclusively an American genus, embracing about thirty species, mostly from the warmer and tropical parts.
1. S. Marilandica. Worm-grass or Pink-root. - A hand-some herbaceous plant usually growing about a foot high. Leaves sessile, ovate-lanceolate, glabrous. Flower-spike terminating the simple stems, 4- to 8-flowered, the lowermost opening first. Flowers crimson without, bright yellow within, about 1 1/2 inch long, produced in Summer.