BioStor
 | Materials toward a monograph of the genus Verbena. XVIII H N Moldenke (1964) Phytologia 10: 89-161 |
 | Materials toward a monograph of the genus Verbena. XXIX H N Moldenke (1965) Phytologia 11: 435-507 |
 | Additional notes on the genus Verbena. VI H N Moldenke (1968) Phytologia 16: 87-106 |
 | Additional notes on the genus Verbena. XII H N Moldenke (1972) Phytologia 23: 257-303 |
 | Additional notes on the genus Verbena. XXIV H N Moldenke (1977) Phytologia 36: 117-158 |
 | Additional notes on the genus Verbena. XXV H N Moldenke (1977) Phytologia 36: 216-250 |
 | Notes on new and noteworthy plants. CLIII H N Moldenke (1981) Phytologia 50: 12-14 |