Bract
a leaf-like structure, different in form from the foliage leaves and without an axillary bud, associated with an inflorescence or flower.
bract. A modified leaf at the base of a flower.
broad-spectrum pesticide. A pesticide that kills a large number of unrelated species.
bract
A modified leaf with a single flower growing in its axil.
branch primordia
A lateral stem that is in its earliest stage of differentiation.
bract A modified leaf or leaflike structure, usually much reduced in size.
bradycardia Marked slowing of the heartbeat rate during a breath-hold dive.
Poinsettia bracts are leaves which have evolved red pigmentation in order to attract insects and birds to the central flowers, an adaptive function normally served by petals (which are themselves highly modified leaves).
 See also: Plant, Leaf, Division, Trans, Species
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