BioStor
 | The known geographic distribution of the members of the Verbenaceae, Avicenniaceae, Stilbaceae, Symphoremaceae, and Eriocaulaceae. Supplement 5 H N Moldenke (1951) Phytologia 3: 448-468 |
 | Materials toward a monograph of the genus Verbena. IV H N Moldenke (1962) Phytologia 8: 230-272 |
 | 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. III H N Moldenke (1967) Phytologia 14: 275-301 |
 | Additional notes on the genus Verbena. V H N Moldenke (1968) Phytologia 16: 48-56 |
 | Additional notes on the genus Verbena. X H N Moldenke (1972) Phytologia 23: 181-196 |
 | Additional notes on the genus Verbena. XX H N Moldenke (1974) Phytologia 28: 195-221 |
 | Additional notes on the genus Verbena. XXIV H N Moldenke (1977) Phytologia 36: 117-158 |
 | Additional notes on the genus Verbena. XXVIII H N Moldenke (1979) Phytologia 41: 151-182 |