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.
Erect perennials. Leaves deeply palmately lobed. Flowers terminal, large, globular, yellow or lilac. Sepals 5 to 15, petaloid. Petals 5 to 15, small, narrow, shortly clawed, with a glandular pit at the base of the blade. Carpels many, several-seeded. Few species, natives of temperate Europe, Asia, and North America. Name from trol, a globe, in Old German.
1. T. Europaeus (fig. 10). Common Globe Flower. - This plant is a native of Britain and the mountains of Central Europe generally. It is in bloom from May to July.
Fig. 10. Trollius Europaeaus. (1/4 nat. size.)
Flowers lemon-yellow. T. Asiaticus has dark orange rather larger flowers; T. Caucasicus bright yellow; and T. Ameri-canus, a dwarfer species, has also yellow flowers with spreading sepals.