taxonID	type	description	language	source
577987927702FFE3FF37A491FBD75096.taxon	materials_examined	Type: -- MALAYSIA. Peninsular Malaysia: Terengganu, Jambu Bongkok F. R., 22 February 2025, Rafidah & Nik Faizu FRI 108082 (holotype KEP; isotype SING).	en	Rahman, Rafidah Abdul, Lu, Lim Chung, Hassan, Nik Faizu Nik (2025): Dichapetalum salicinum (Dichapetalaceae), a new narrowly leaved species from Peninsular Malaysia. Phytotaxa 734 (3): 281-288, DOI: 10.11646/phytotaxa.734.3.4, URL: https://doi.org/10.11646/phytotaxa.734.3.4
577987927702FFE3FF37A491FBD75096.taxon	description	Scandent shrub, reaching the forest canopy. Twigs tough, slightly zigzag. Young to old branches with appressed hairs, with sparse lenticels. Stipules narrowly triangular, 1 – 2 mm long, appressed hairy, persistent. Leaves alternate, adaxially greenish when dry; petiole brown, 4 – 6 mm long, hairs densely appressed; lamina very narrow linear-lanceolate, 7.0 – 20 × 1.0 – 1.8 cm, bright green, slightly shining above (when fresh), pale green beneath, chartaceous, apex acute, base cuneate, slightly oblique, margin entire, without glands; midrib prominent on the lower surface, secondary veins 4 – 5 pairs, anastomosing on both surfaces, tertiary veins reticulate. Inflorescence cymose, axillary, borne on pedicels near to junction with lamina, with many flowers. Bracts and bracteoles ovate-triangular. Pedicel up to 5 mm long. Flowers: sepals 5, recurved when mature, c. 2 mm long, densely brown tomentose outside, glabrous on the apical part inside, recurved. Petals with 5 lobes, bifid near to the base, broadly spathulate, apex lobed or subentire, glabrous. Stamens 5, free, alternating with and about equal to or slightly longer than petals, filament c. 2 mm long, glabrous, anthers c. 1 mm long, basifixed, opening by a longitudinal slit; nectary present. Staminodes unknown. Pistil shorter, depressed globose, ovary bilocular or trilocular, with 2 pendulous ovules in each loculus, densely lanate on exterior, shortly velutinous; style one, lanate at base, glabrous above, stigma trifid. Fruit greenish-brown, 1 – 1.2 × 1.0 – 2.2 cm, reniform, often with 2 to 3 lobes, densely brown velvety with white villous hairs. Seed 1 per locule.	en	Rahman, Rafidah Abdul, Lu, Lim Chung, Hassan, Nik Faizu Nik (2025): Dichapetalum salicinum (Dichapetalaceae), a new narrowly leaved species from Peninsular Malaysia. Phytotaxa 734 (3): 281-288, DOI: 10.11646/phytotaxa.734.3.4, URL: https://doi.org/10.11646/phytotaxa.734.3.4
577987927702FFE3FF37A491FBD75096.taxon	biology_ecology	Phenology: — Flowering and fruiting in between December to March. Habitat: — In open areas, about 70 % sunlight, in coastal heath forest in Jambu Bongkok F. R., Terengganu.	en	Rahman, Rafidah Abdul, Lu, Lim Chung, Hassan, Nik Faizu Nik (2025): Dichapetalum salicinum (Dichapetalaceae), a new narrowly leaved species from Peninsular Malaysia. Phytotaxa 734 (3): 281-288, DOI: 10.11646/phytotaxa.734.3.4, URL: https://doi.org/10.11646/phytotaxa.734.3.4
577987927702FFE3FF37A491FBD75096.taxon	etymology	Etymology: — The leaves resembling those of the willow, Salix spp. (Salicaceae).	en	Rahman, Rafidah Abdul, Lu, Lim Chung, Hassan, Nik Faizu Nik (2025): Dichapetalum salicinum (Dichapetalaceae), a new narrowly leaved species from Peninsular Malaysia. Phytotaxa 734 (3): 281-288, DOI: 10.11646/phytotaxa.734.3.4, URL: https://doi.org/10.11646/phytotaxa.734.3.4
577987927702FFE3FF37A491FBD75096.taxon	conservation	Preliminary IUCN conservation status: — Critically Endangered B 1 + 2 ab (ii, iii, iv). Dichapetalum salicinum is known only from a single locality, where it appears to have a highly restricted distribution and low population density. Its habitat lies outside protected areas and is vulnerable to forest fires during dry seasons, which can damage or kill the host trees that this scrambling shrub depends on for growth and support (Fig. 3). Despite several botanical surveys conducted in similar vegetation types in the surrounding area, the species has not been recorded elsewhere. This indicates its extreme rarity and suggests that even small disturbances could have serious consequences for its continued survival.	en	Rahman, Rafidah Abdul, Lu, Lim Chung, Hassan, Nik Faizu Nik (2025): Dichapetalum salicinum (Dichapetalaceae), a new narrowly leaved species from Peninsular Malaysia. Phytotaxa 734 (3): 281-288, DOI: 10.11646/phytotaxa.734.3.4, URL: https://doi.org/10.11646/phytotaxa.734.3.4
577987927702FFE3FF37A491FBD75096.taxon	materials_examined	Other specimens examined: — MALAYSIA. Peninsular Malaysia. Terengganu, Jambu Bongkok F. R., 16 October 1983, Kamarudin KMS 1052 (UKMB); 11 March 1984, Zainudin AZ 1270 (UKMB); 20 June 2023, Rafidah et al. FRI 104445 (KEP); 20 December 2024, Rafidah & Nik Faizu FRI 108080 (KEP).	en	Rahman, Rafidah Abdul, Lu, Lim Chung, Hassan, Nik Faizu Nik (2025): Dichapetalum salicinum (Dichapetalaceae), a new narrowly leaved species from Peninsular Malaysia. Phytotaxa 734 (3): 281-288, DOI: 10.11646/phytotaxa.734.3.4, URL: https://doi.org/10.11646/phytotaxa.734.3.4
577987927702FFE3FF37A491FBD75096.taxon	discussion	Discussion: — Dichapetalum salicinum is morphologically similar to D. tenuifolium, particularly in the presence of anastomosing secondary veins on both adaxial and abaxial surfaces and fruit with 2 or 3 lobes but differs in leaf sizes. This species is unique among other species in the genus for its adaptation to coastal heath forest, unlike most species which are typically found in lowland to hill forests, or limestone and swamp habitats. In young plants, some lenticels on the twigs greatly enlarge and look like a fruit (Fig. 4). However, they are galls from the lenticels, the result of some insect that causes harm by tunnelling into the wood. Gall formation is usually the result of a specific plant-insect interaction, often involving chemical manipulation of plant tissues (Stone & Schönrogge 2003). These relationships can be highly host-specific and may indicate co-evolutionary adaptations (Price et al. 1987). Since this is a newly described species, further research is needed to understand how gall formation might affect its reproduction, for example, whether it reduces flowering or fruiting. This is important because the species appears to be rare and may be vulnerable to small changes in its environment. Genetic studies could also help to assess how much variation exists within its population, and whether the gall-forming insect is closely linked to this species. This information would be useful for future conservation and ecological understanding.	en	Rahman, Rafidah Abdul, Lu, Lim Chung, Hassan, Nik Faizu Nik (2025): Dichapetalum salicinum (Dichapetalaceae), a new narrowly leaved species from Peninsular Malaysia. Phytotaxa 734 (3): 281-288, DOI: 10.11646/phytotaxa.734.3.4, URL: https://doi.org/10.11646/phytotaxa.734.3.4
577987927707FFE6FF37A027FAF9520C.taxon	discussion	In Peninsular Malaysia, there are now nine species with three endemics. A key to the taxa is provided below. A full revision of the family Dichapetalaceae is scheduled for Volume 12 of the Flora of Peninsular Malaysia.	en	Rahman, Rafidah Abdul, Lu, Lim Chung, Hassan, Nik Faizu Nik (2025): Dichapetalum salicinum (Dichapetalaceae), a new narrowly leaved species from Peninsular Malaysia. Phytotaxa 734 (3): 281-288, DOI: 10.11646/phytotaxa.734.3.4, URL: https://doi.org/10.11646/phytotaxa.734.3.4
