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.
Calyx shortly turbinate at the base. Petals nearly equal. Pod sessile or shortly stalked, linear or oblong, inflated, valves slightly coriaceous. Herbs with creeping rhizomes. Leaves digitately trifoliolate; stipules foliaceous, free. About twelve species are described, all inhabiting the north temperate zone. The name is compounded from the Greek a lupine, and
appearance or resemblance.
1. Th. fabacea. - A pretty erect herbaceous summer-flowering plant somewhat woody at the base, about 2 feet high. Leaflets ovate-lanceolate, hairy beneath. Flowers yellow, about an inch across, in terminal loose racemes. Siberia.