REVISION OF THE VERBEN A CEAE. 



OF THE DUTCH EAST-INDIES AND 

 SURROUNDING COUNTRIES 



BY 



H. J. Lam and R. C. Bakhuizen van den Brink. 

 assistants at the Herbarium of the Botanical Gardens of Buitenzorg. 



Introduction. 



The dissertation of the first-named author ') published the results of his 

 investigations on the collections of the Verbenaceae extant in the Herbaria of 

 Leiden, Utrecht and Berlin. On occount of the war the material from the 

 Buitenzorg-Herbarium could not be obtained. Upon arriving at Buitenzorg the 

 first-named author was glad of the opportunity to complete his work there. 

 He found, however, that the second-named author, wholly independently, 

 had also worked on the same family for a considerable time. Because our 

 methods are rather different, we have had some trouble in reaching a sa- 

 tisfactory agreement for combining our work in order to publish a new 

 revision of the order, based upon Buitenzorg material. Though we could 

 not find an entirely satisfactory solution of the matter, yet we thought it 

 best not to resign and have finally concluded that each of us should 

 revise a certain part of the order, for which he will take the full respon- 

 sibility. For this purpose, the natural order was divided in the following 

 way: the first-named author has elaborated the genera: Verbena, Lantana, 

 Lippia, Stachytarpheta, Petraea, Duranta, Schizoptemna, 7 ectona, Xerocarpa, 

 Premna, Pygmaeopremna, Viticipremna, Vitex, Faradaya, Hosea, Holmskjoel- 

 dia,' Peronema, Petraeovitex, Symphorema, and ?phenodesme, whilst the 

 second author reviewed the genera: Priva, Geunsia, Callicarpa, Teysman- 

 niodendron, Gmelina, Oerodendron, Congea and Avicennia. 



It must be said with emphasis, however, that while this revision is 

 published jointly it does not imply that each of us agrees in all respects 

 with the work of the other, and though we endeavoured to do so a cer- 

 tain individuality will sometimes prevent the uniformity desired. The part, 



') H. J. Lam. The Verbenaceae of the Malayan Archipelago, together with those from 

 the Malayan Peninsula, Philippines, the Bismarck-Archipelago and the Palau— Marianne— 

 and Caroline- islands.— Groningen, March 31st. 1919. 



