| Name | Structure/ Category | Description |
|---|---|---|
| Banded | [Leaf lower surface, Leaf upper surface] {color variegation} | Transverse, or horizontal, stripes of one color crossing another. |
| Bark | The outermost layer of a woody stem, usually with one or more corky layers that prevent water loss and protect the inner living tissues from mechanical damage. | |
| Basal | (1) At or very near the base of a plant structure. | |
| Basal | (2) [Leaves] {position} | With leaves arising at or near the base of the stem. |
| Basal | (3) [Placentation] {type} | Attachment of ovules at the base of the ovary. |
| Base | The portion of a plant structure (such as a leaf, bud, stem, etc.) nearest the point of attachment or lowermost; the bottom. | |
| Beak | This is a pointed slender appendage that defines the outer tip of a seedpod; the seedpods of many plant species lack beaks. For Carex spp. (Sedges), this term has a different meaning. The perigynium of a Carex sp. can have a slender beak at its apex to enclose the long style of a female floret, or the perigynium can be nearly beakless when the style of the female floret is quite short. | |
| Berry | [Fruits] {type} | A fleshy fruit that does not split open at maturity (indehiscent), with few or more seeds (rarely just one), the seeds without a stony covering; the flesh may be more or less homogenous or with the outer portion more firm or leathery; as grapes (Vitis). |
| Biconvex | convex on both sides | |
| Biennial | [Plants] {life span} | Normally living two years; germinating or forming and growing vegetatively during one cycle of seasons, then reproducing sexually and dying during the following one. |
