Glossary Details – French Guianan E-Flora Project

Glossary Details:

Title: Venation in leaflets. Drawing by M. Sashital.

Description: Isodromous, anadromous, and catadromous venation refers to the position of the first secondary vein of a leaflet in relationship to the apex of the leaflet, i.e., are the two secondary veins opposite, does the first secondary vein arise on the basal side of the secondary leaflet, or does the first secondary vein arise on the apical side of the secondary leaflet. This venation feature is often used in classifying and identifying ferns.

Term:

Catadromous

Definition:

Referring to a venation pattern in which the first vein in a given segment arises on the side of the leaf segment toward the base.

Related Terms:

Isodromous
Anadromous