This is a checklist of the native and naturalized vascular plants occurring on the University of California Natural Reserve System's San Joaquin Marsh Reserve (SJMR) in Irvine, California. The SJMR is located 1.25 miles upstream of Upper Newport Bay and the San Diego Creek flood control channel passes through the reserve near its southeastern boundary. This checklist is an update to the Vascular Plant Checklist for the University of California Natural Reserve System's San Joaquin Marsh Reserve by Peter A. Bowler and Mark A. Elvin (2003), which includes a broader discussion of the ecology and history of the marsh.

This checklist lists all known vascular plants documented from Bowler and Elvin (2003) and herbarium specimen vouchers, which are linked to the Consortium of California Herbaria (cch2.org). For each plant, we list duration and origin. Plant duration includes annual, biennial, and perennial. Plant origins we define as:

NATIVE: thought to occur naturally in the area, not human introduced;

NATURALIZED: not native but successfully reproducing and spreading in native habitats without human intervention;

PERSISTING FROM CULTIVATION: originally planted/cultivated, but no longer maintained; not reproducing or escaping into native habitats;

DELIBERATE RESTORATION INTRODUCTION: a deliberate introduction for restoration or habitat enhancement purposes;

WAIF: not native to the area, having been (unintentionally) human introduced, escaped from cultivation, or naturally dispersed into a natural habitat, but currently not or sparingly reproducing/spreading past initial generation or establishment. Some potential to become naturalized.

Checklist Curators: Rebecca E. Crowe, Peter A. Bowler