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.
Deciduous branching shrubs with small pentamerous white flowers in drooping axillary racemes or panicles. Fruit capsular, inflated, membranous, 2- or 3-lobed and 2- or 3-celled, with 1 or more albuminous seeds in each cell. About four species, in temperate Asia, North America, and Europe. The name is derived from a bunch or cluster.
1. S. pinnata. Common Bladder-nut. - A shrub 6 to 8 feet high with imparipinnate leaves of 5 or 7 lanceolate glabrous leaflets. Flowers white, racemose. Fruit membranaceous, vesiculose. Central Europe.
2. 8. trifoliata. American Bladder-nut. - Differs from the preceding in its larger white flowers and trifoliolate leaves.