Carya cordiformis (Bitternut or Swamp Hickory)
Native: Eastern N. America
Location: Cultivated in Europe in botanical collects and large gardens.
Distinguished from other hickories by its yellow winter buds.
Leaves have seven or nine leaflets.
Male catkins expand to 6-7.5cm shedding pollen in late May, or early June. The female flowers are inconspicuous between leaves at tips of growing shoots.
Fruit has four ridges on the top half.