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they are bisexual and zygomorphic.
son bisexuales y zigomorfas.

the flowers are zygomorphic and hermaphrodite.
las flores son zigomorfas y hermafroditas.

their flowers are zygomorphic, but are very variable.
el fruto es dehiscente o indehiscente, muy variable.

it produces a spike of zygomorphic flowers in the late summer.
produce una espiga de flores zigomorfas a finales del verano.

the flowers have four (rarely three) petals; they are zygomorphic, with all the petals directed somewhat upwards.
las flores tienen cuatro pétalos (raramente tres).

the family’s common identification markers are e.g. whorled zygomorphic flowers, a bristly stem and opposite (whorled) leaves.
los marcadores comunes de identificación de la familia son, por ejemplo, un tallo cerdoso, flores en forma de espiral (verticiladas) y hojas opuestas.

"geranium" flowers have five very similar petals, and are thus radially symmetrical (actinomorphic), whereas pelargonium flowers have two upper petals which are different from the three lower petals, so the flowers have a single plane of symmetry (zygomorphic).
las flores correspondientes al género "geranium" presentan cinco pétalos muy similares y radialmente simétricos, mientras que las que se corresponden con el género "pelargonium", presentan los dos pétalos superiores diferentes de los tres inferiores.