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Birch Family. Comprised of 6 genera and about 145 species. Members are trees and shrubs that have simple, serrate, alternative leaves and are deciduous.

Entry link: Betulaceae


Refers to plants that need two years to complete their life cycle.
Entry link: Biennial


Trumpet Creeper or Catalpa Family. Comprised of about 110 genera and more than 800 species of trees, shrubs and, most commonly, vines. Members of this family usually have bright trumpet-shaped flowers in clusters, four stamens, a superior seed capsule containing flat winged seeds, no stipules and are mostly tropical woody climbers.
Entry link: Bignoniaceae


A leaf of grass or the broad portion of a leaf as distinct from the petiole.
Entry link: Blade


Pigmented spot with an indistinct outline or shape.
Entry link: Blotch


Borage or Forget-me-Not Family. Comprised of 148 genera and more than 2,700 species. Frequently herbaceous and hairy and can be annuals or perennials. Members of this family usually have blue flowers in a coiled inflorescence, hairy stems and leaves, no stipules, and produces four seeds.
Entry link: Boraginaceae


A specialized leaf-like structure, from which a flower or flower stalk grows; some may be very small.
Entry link: Bract


(formerly Cruciferae) Mustard Family. Comprised of 338 genera and about 3,700 species of major economic importance. They are usually herbs and can be annuals, biennials, or perennials. Members of this family usually have four petalled flowers in a cross shape, clusters of flowers, and a papery membrane dividing a two-chambered seed capsule.
Entry link: Brassicaceae


Flowering Rush Family. Comprised of just one species, Butomus umbellatus. It is native to Europe and Asia and has become naturalized in temperate North America.

Entry link: Butomaceae



Water Shield Family. Comprised of 2 genera and about 6 species of aquatic, herbaceous plants that live in still or slow-moving waters of temperate and tropical North and South America, Europe, Asia, Africa and Australia.

Entry link: Cabombacaea

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