Wercklea woodsonii

Native to Costa Rica and Panama, this tree belongs to the mallow family and can reach about 65 feet tall. It grows in wet tropical forest. Its large leaves have heart-shaped bases, wavy or sparsely toothed margins, and fine, star-shaped hairs. Large yellow flowers have a long central column of stamens surrounded by a hairy calyx with stiff, pointed hairs. The fruits are pointed, bristly capsules with five angles or wings. Photographed in Panama.