Secretory Structures of Subterranean Organs of Some Species of the Cardueae, and Their Diagnostic Value

摘要

Secretory ducts and cavities of roots and rhizomes are typical features of the Cardueae tribe in the Asteraceae family. We used light microscopy to analyze the anatomy of the subterranean organs of 21 species of 13 genera of the Cardueae, with particula