rosetas

Rosettes, or rosetas in some languages, describe circular or radiating arrangements of plant organs or cells around a central point. In botany, a rosette refers to a growth form in which leaves radiate from a short stem at or near the ground, forming a circular cluster. This leaf rosette is common in many herbaceous and succulent species. Rosette plants may be annual, biennial, or perennial. The rosette growth can persist for years, with flowering sometimes occurring later from the center. In some species, the inflorescence replaces the rosette and the above-ground rosette dies after flowering (monocarpic species). The arrangement can help in light capture, protect the apical meristem, and reduce water loss in dry or cold environments. Examples include dandelion (Taraxacum officinale), Agave, Aloe, and many bromeliads; rosettes are also a hallmark of several ornamental perennials and garden succulents.

In medical pathology, rosettes describe a histological pattern in which tumor cells arrange themselves around a central lumen or neuropil, forming a circular or radiating structure. Classic examples include Homer Wright rosettes seen in neuroblastoma and Flexner-Wintersteiner rosettes associated with retinoblastoma. Rosette formations can aid in tumor classification but are not exclusive to a single diagnosis.