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• A genus of flowering plants in the family Boraginaceae.

• A family of flowering plants, commonly known as the heath or heather family. Ericaceae is made up mostly of shrubs and small trees, and its members are widely distributed, extending into the subarctic and along mountain chains through the tropics.

• The Elgin Botanic Garden, established in 1801 in New York City by Dr. David Hosack (1769–1835), was a systematic arrangement of plants for scientific and pedagogical purposes. It served as a garden for teaching botany and materia medica at both the medical school of Columbia College and the College of Physicians and Surgeons. It was located in the area that is now midtown Manhattan.

• Natural dyes. Colours extracted from plants.

Use for: Elm blight

• A widespread fungoid killer of elms (Ulmus species) and certain other trees, first described in the Netherlands. Spread by bark beetles, the disease has decimated elm populations throughout much of Europe and North America.

• The yam family. Plants are herbaceous or woody vines and shrubs, distributed throughout tropical and warm temperate regions. Members of the family have thick, sometimes woody roots or tuber-like underground stems and net-veined, often heart-shaped leaves that sometimes are lobed. The small green or white flowers of most species are borne in clusters in the leaf axils. The fruit is a winged capsule or a berry.

Use for: yams

• A genus of mostly tropical twining herbs (family Dioscoreaceae) including the yams and having net-veined leaves and small dioecious flowers

Use for: larkspur

• A genus of herbaceous plants in the buttercup family (Ranunculaceae), many of which are grown for the floral industry and as ornamentals for their showy flower stalks.