The Manual of the Botany of the Northern United States / Including the District East of the Mississippi and North of North Carolina and Tennessee

by Asa Gray

2. Thermopsis. Pod flat, linear.

[*][*] Leaves pinnate; calyx-teeth short. (Sophoreæ.)

3. Cladrastis. Flowers panicled, white. Pod flat. A tree.

4. Sophora. Flowers racemose, white. Pod terete, moniliform. Herbaceous.

II. Stamens monadelphous, or diadelphous (9 and 1, rarely 5 and 5); nearly distinct in n. 14.

[*] Anthers of two forms; stamens monadelphous; leaves digitate or simple; leaflets entire. (Genisteæ.)

5. Crotalaria. Calyx 5-lobed. Pod inflated. Leaves simple.

6. Genista. Calyx 2-lipped. Pod flat. Seed estrophiolate. Leaves simple. Shrubby.

7. Cytisus. Calyx 2-lipped. Pod flat. Seed strophiolate. Leaves 1–3-foliolate. Shrubby.

8. Lupinus. Calyx deeply 2-lipped. Pod flat. Leaves 7–11-foliolate.