Hortus siccus refers to a collection of dried plant specimens that are stored for reference or study purposes. However, there are several synonyms for this phrase that can be used interchangeably in scientific settings. Some of these synonyms include "herbarium," "pressed plant collection," or "dried plant specimens." Each of these phrases describes a similar concept to hortus siccus, but may be favored by different botanical disciplines or geographical regions. Ultimately, the use of any of these synonyms makes it clear that a collection of dried plants is being discussed and can assist in facilitating clear communication in the scientific community.