taxonID	type	description	language	source
B680676EA0035F1FBA0558D5CF7623EA.taxon	description	Figs 1, 2, 3	en	Tran, Van Tien, Tran, The Bach, Vu, Ha Phuong, Cao, Hoang Tuan, Bui, Thu Ha (2025): Eriolaena bacgiangensis (Malvaceae), a new species from Vietnam. PhytoKeys 256: 13-20, DOI: 10.3897/phytokeys.256.152884
B680676EA0035F1FBA0558D5CF7623EA.taxon	diagnosis	Diagnosis. Eriolaena bacgiangensis is most similar to E. candollei due to the shape of the leaf blade, number of basal and lateral veins, presence of epicalyx in the flower bud, lanceolate epicalyx; shape of sepal (linear – lanceolate) and yellow petals. E. bacgiangensis differs from E. candollei by the pedicel length (1.4 – 2.3 cm), presence of epicalyx after flowers at anthesis, densely fringed epicalyx, style significantly exceeds staminal tube length and fruit apex round.	en	Tran, Van Tien, Tran, The Bach, Vu, Ha Phuong, Cao, Hoang Tuan, Bui, Thu Ha (2025): Eriolaena bacgiangensis (Malvaceae), a new species from Vietnam. PhytoKeys 256: 13-20, DOI: 10.3897/phytokeys.256.152884
B680676EA0035F1FBA0558D5CF7623EA.taxon	description	Description. Small tree up to 8 m tall; branchlets stellate puberulent. Stipules caducous. Petioles 1.1 – 6.0 cm long, densely pubescent. Leaf blades cordate, 7.0 – 23 × 3.6 – 18.0 cm; apex acute to caudate; base shallowly cordate; surfaces pubescent; veins densely pubescent; stellate hairy, denser abaxially; margin obtusely dentate; basal veins 5 – 7; secondary veins 3 – 5 - paired. Inflorescence racemose, axillary to terminal, 3 – 10 - flowered, 13.0 – 18.0 cm long. Flower pedicels 1.4 – 2.3 cm long, densely pubescent. Flower buds with epicalyx; epicalyx horizontal or pendulous; lanceolate, 1.5 – 1.6 × 0.6 – 0.7 cm, densely pubescent. Epicalyx present after flowers at anthesis, 1.3 – 1.5 × 0.2 – 0.4 cm; epicalyx lobe linear, margin pinnately partite, densely fringed, densely woolly stellate pilose. Calyx and corolla 5 - merous. Sepals 5, valvate, linear – lanceolate, 2.0 – 2.9 × 0.47 – 0.53 cm; abaxially stellate hairy, adaxially villous. Petals 5, yellow to orange, oblong-rectangle; petals are turned backwards between the sepals; 1.3 – 1.5 × 0.6 – 0.7 cm, broader than sepals; above part glabrous; apex entire to emarginate; narrowed towards the base, claw broad, thick densely pubescent, deflexed between the sepals. Stamens many, connate into cylindrical tube; staminal tube covering the ovary and style, 1.1 – 1.3 cm long; anthers linear-oblong to rectangular, 0.21 – 0.31 × 0.04 cm, 2 - celled, cells parallel. Ovary superior, ovate, 0.07 – 0.08 × 0.05 – 0.06 cm, pubescent; style linear, simple, 2.0 – 2.2 cm long, style significantly exceeds staminal tube length; stigma 5 – 7 - lobed, lobes needle-like, horizontal to down-curved. Capsules ovate-elliptic, woody, 2.0 – 2.5 × 1.3 – 1.8 cm, longitudinally grooved, fruit apex round; fruit stalk 3.5 – 3.7 cm long; densely hairy.	en	Tran, Van Tien, Tran, The Bach, Vu, Ha Phuong, Cao, Hoang Tuan, Bui, Thu Ha (2025): Eriolaena bacgiangensis (Malvaceae), a new species from Vietnam. PhytoKeys 256: 13-20, DOI: 10.3897/phytokeys.256.152884
B680676EA0035F1FBA0558D5CF7623EA.taxon	etymology	Etymology. The specific epithet refers to the type locality, Bac Giang Province in Vietnam.	en	Tran, Van Tien, Tran, The Bach, Vu, Ha Phuong, Cao, Hoang Tuan, Bui, Thu Ha (2025): Eriolaena bacgiangensis (Malvaceae), a new species from Vietnam. PhytoKeys 256: 13-20, DOI: 10.3897/phytokeys.256.152884
B680676EA0035F1FBA0558D5CF7623EA.taxon	distribution	Distribution and ecology. E. bacgiangensis is found only in Vietnam, Bac Giang Province, Son Dong District, Huu San Commune, where it grows in well-lit places in shrubland and dry soil of secondary forest, in association with Acacia mangium Willd., Bidens pilosa L., Cayratia trifolia (L.) Mabb. & J. Wen, Chromolaena odorata (L.) R. M. King & H. Rob. and Stachytarpheta jamaicensis (L.) Vahl. Flowering and fruiting specimens were collected in July 2015.	en	Tran, Van Tien, Tran, The Bach, Vu, Ha Phuong, Cao, Hoang Tuan, Bui, Thu Ha (2025): Eriolaena bacgiangensis (Malvaceae), a new species from Vietnam. PhytoKeys 256: 13-20, DOI: 10.3897/phytokeys.256.152884
