How to Care Buckwheat vine

Species of pteroxygonum are twining vines growing from a large woody globe-shaped tuber. Their leaves are broad and palmate with a dark red mark around each primary leaf vein. The inflorescence is in the form of an axillary raceme. The flowers are bisexual with five spirally arranged tepals eight stamens joined at the base and three styles also joined up to about the middle. Their fruits are in the form of winged three-angled achenes. As of spring 2019 two species are recognized. Their native range is from Tibet to southeast China.

The reynoutria form a very small genus of large, flowering plants in the buckwheat (sometimes called knotweed) family. A few species within this genus are utilized by beekeepers for their pollen production. The genus on the whole, however, is more famous for hosting several invasives, most notable among these being Japanese Knotweed (R. japonica). Japanese Knotweed, now found in temperate regions around the world, is considered one of the most aggressive and harmful invasive plant species on the planet.

Species of bistorta are perennial herbaceous plants. Their roots are fibrous forming rhizomes. They have erect unbranched stems. Their leaves are usually longer than wide mostly basal but with some arranged alternately on the stems. The inflorescences are spikelike. The individual flowers have five white to purple-pink (rarely red) tepals. The flowers are bisexual although the 5–8 stamens are sometimes poorly developed. There are three styles. The fruits are in the form of achenes that are brown or dark brown unwinged and three-angled. As of winter 2019 about 42 species are accepted. Bistorta species are native throughout much of the Northern Hemisphere as far south as Mexico in North America and Thailand in Asia.

Woodland threadstem is genus containing only a single species. Woodland threadstem is a very small annual spreading or climbing plant with very thin, hairy stems. The tiny leaves are lobed or heart-shaped and may be green or pink. The plant may sprawl across the ground in a thin layer or may form small patches here and there. The plant bears tiny bright pink flowers. The plant is native to the United States and Northwestern Mexico.