shrub-trefoil; a genus of the monogynia order, belonging to the tetrandria class of plants. The species are, 1. The trifoliata, or Carolina shrub-trefoil, hath a shrubby upright stem, dividing into a branchy head eight or ten feet high, covered with a smooth purplish bark, trifoliate leaves formed of oval-fleur-shaped foliotes, and the branches terminated by large bunches of greenish-white flowers, succeeded by roundish, bordered capsules. 2. The viscosa, or viscous Indian ptelea, rises with several strong shrubby stems, branching erectly 12 or 15 feet high, having a light brown bark, spear-shaped, stiff, simple leaves, and the branches terminated by clusters of greenish flowers.

The first species is a hardy deciduous shrub, and a proper plant for the shrubbery and other ornamental plantations to increase the variety. It is propagated by seeds, layers, and cuttings.

The second species is a flowery plant, and is propagated commonly by seeds.