Notes on the Malayan Dipterocarpaceae, VI
C. F. Symington’s 1941 publication in the Journal of the Malayan Branch, Royal Asiatic Society documents the taxonomic revision of seven new dipterocarp species from the Malay Peninsula while resolving longstanding nomenclatural confusion within the genera Hopea, Vatica, and Shorea. Written during wartime restrictions that prevented its original publication in the Gardens’ Bulletin, the paper serves as a critical botanical record for forest officers and researchers, establishing definitive vernacular names and clarifying the distribution of economically significant timber trees.
Summary
This paper continues a series of notes on Malayan Dipterocarpaceae, originally intended for the Gardens’ Bulletin, Straits Settlements, but redirected to the Journal of the Malayan Branch, Royal Asiatic Society due to war conditions (p. 133). Symington describes seven new species, including six from the genus Hopea and one each from Vatica and Shorea, providing detailed morphological descriptions and field notes for each (p. 133). The work is structured to assist Malayan forest officers, with concluding precis under each heading summarizing key identification features and vernacular names, such as merawan gunong for the high-elevation Hopea montana (p. 136) and merawan mempisang for the small Hopea polyalthioides (p. 144).
Beyond new descriptions, the author undertakes a significant taxonomic cleanup of previously confused species. Symington clarifies the status of the Barbata group within Shorea and resolves complex synonymies involving six species of Vatica, including the recombination of Vatica odorata and the distinction between Vatica cuspidata and Vatica Maingayi (pp. 147–156). He also extends the known distribution of Shorea sericeiflora into peninsular Thailand and Kedah, and proposes the unification of Shorea Talura, S. floribunda, and S. cochinchinensis pending further study (pp. 159–160). Additionally, the paper formally describes the Bornean timber tree Shorea pachyphylla, noting its abundance near the Seriah oilfields in Brunei (p. 163).
Key Findings
- New Species Descriptions: Symington formally describes seven new dipterocarp species, including Hopea johorensis from eastern Johore and Hopea montana from the high elevations of Gunong Korbu (pp. 134–136).
- Taxonomic Clarifications: The paper resolves confusion between Vatica cuspidata and Vatica Maingayi, establishing that van Slooten’s V. Maingayi was actually V. cuspidata (p. 148).
- Nomenclatural Corrections: The correct botanical name for the species previously known as Vatica Curtisii is established as Vatica odorata (Griff.) Sym., based on priority of publication (p. 155).
- Distribution Extensions: Shorea sericeiflora, previously known from Burma, is recorded as extending into peninsular Thailand and the Langkawi Islands (p. 159).
- Timber Significance: Shorea pachyphylla is identified as a heavy red meranti timber tree common near the Seriah oilfields in Brunei, with strength properties superior to other tested red merantis (p. 164).
- Group Circumscription: The Barbata group of Shorea is defined as a natural subdivision of the section Eushorea, characterized by ovate flower buds and bearded staminal appendages (p. 161).
Conclusion
Symington’s definitive historical takeaway is the necessity of rigorous nomenclatural stability for effective forest management and botanical research in the Malay Peninsula. By correcting misidentifications that had persisted in literature since the late 19th century, such as the confusion between Vatica Lowii and V. Maingayi, the author ensures that future forestry operations and scientific studies rely on accurate species identification (p. 149). The paper underscores the importance of herbarium collections and field notes in resolving taxonomic ambiguities, particularly for species with overlapping morphological traits like the Vatica and Shorea complexes.
Context
- Colonial Role: The work was produced by the Forest Research Institute, Kepong, highlighting the British colonial administration’s investment in botanical science to manage and exploit forest resources during the pre-war period.
- Archival Collections: Symington references extensive herbarium holdings at the Forest Research Institute, Singapore, Kew, and Calcutta, noting the disruption of duplicate distribution due to war conditions (p. 133).