Catalpa speciosa, commonly known as the Northern catalpa.It is a medium-sized deciduous tree growing to 15-30 meters tall and 12 meters wide. It has a trunk up to 1 m diameter with brown to gray bark, maturing into hard plates or ridges. The leaves, deciduous, opposite (or whorled), are large, heart shaped, 20-30 cm long and 15-20 cm broad, pointed at the tip and softly hairy beneath. The flowers are 3-6 cm across, trumpet shaped, white with yellow stripes and purple spots inside; they grow in panicles of 10-30. The catalpa tree is the last tree to grow leaves in the spring. The leaves generally do not color in autumn before falling, instead, they either fall abruptly after the first hard freeze, or turn a slightly yellow-brown before dropping off. The winter twigs of Northern Catalpa are like those of few other trees, having sunken leaf scars that resemble suction cups.