BioStor
 | The known geographic distribution of the members of t he Verbenaceae and Avicenniaceae. Supplement 6 H N Moldenke (1947) Phytologia 2: 325-348 |
 | Materials toward a monograph of the genus Verbena. XXV H N Moldenke (1964) Phytologia 11: 155-213 |
 | Materials toward a monograph of the genus Verbena. XXVI H N Moldenke (1965) Phytologia 11: 219-287 |
 | Materials toward a monograph of the genus Verbena. XXVII H N Moldenke (1965) Phytologia 11: 290-357 |