Boraginaceae

Nota de alcance (en)

The representatives of the Boraginaceae are trees, shrubs or herbs. The undivided leaves are seldom opposite. The flowers occur in boragoid or scorpioid cymes. The hairs are characteristic: bristle hairs, stellate hairs, hook-shaped hairs and cystoliths are frequent and generate the rough surface. The ovary  is 2-4 celled and transforms into a drupe, nut or into mericarps (nutlets, synonym: 'Klausen'). The walls of the bristle hairs as well as the bases of the cystoliths may be impregnated with Si02 and/ or CaC03• Further chemical contents are the boragoid alkaloids (cynoglossin), allantoin and alkannapigments. Allantoin is a preferred form for the storage and transportation of nitrogen. It improves granulation and is consequently valued as a wound-healing remedy in Boraginaceae. Red dyes corresponding to esters of phenolic compounds are frequent in Boraginaceae with a thick taproot; they probably develop from colourless precursors when the plant is dried. Alkanna tinctoria TAUSCH. yields a red dye, alkannin, in its roots (alkanet root); it is a naphthoquinone derivative, which is permitted as a food dye. Certain species (Lithospermeae) have oestrogenic and contraceptive effects; phenolic compounds are probably the active principles.

Nota bibliográfica (en)

South American medicinal plants : botany, remedial properties, and general use / I. Roth, H. Lindorf. Berlin ; New York : Springer, c2002. -- p. 492.

Boraginaceae
Término aceptado: 05-Sep-2007