Seeds Morning Glory Ipomoea ochracea curtissii or fence morning glory. This perennial vine grows up to 10 feet. The flowers have a dark purple throat and are whitish yellow to medium yellow, funnel-shaped, and up to 1 1/2 inches (4 cm) long. The flowers are followed by egg-shaped seed capsules that typically contain 4 black seeds. The leaves are green, hairless, alternate, and heart-shaped. The stems are slender, green, hairless, and twining.