Clerodendrum fistulosum Becc. is a true myrmecophyte as it offers nesting space for ants in hollow internodes. In contrast to previous reports our investigations proved that these domatia open by themselves, thus providing cavities for a variety of different ant species. In Sarawak, Malaysia, we did not find an obligate relationship between C. fistulosum and a specific ant-partner. For comparison, studies on herbarium material of other Clerodendrum species were carried out: a further species, C. deflexum from the Malay Peninsula and Sumatra presumably also is myrmecophytic.

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Journal Blumea: Biodiversity, Evolution and Biogeography of Plants
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Maschwitz, U, Fiala, B, & Linsenmair, K.E. (1994). Clerodendrum fistulosum (Verbenaceae), an unspecific Myrmecophyte from Borneo with spontaneously opening domatia. Blumea: Biodiversity, Evolution and Biogeography of Plants, 39(1/2), 143–150.