Grewia souladethiana, a new species of Malvaceae from Laos Author Phengmala, Kajonesuk 0000-0003-1508-0704 Faculty of Forest Science, National University of Laos, Dongdok Campus, Xaythany District, Vientiane Capital, Laos k.phengmala@nuol.edu.la Author Tagane, Shuichiro 0000-0002-1974-7329 Kagoshima University Museum, Kagoshima University, 1 - 21 - 30, Korimoto, Kagoshima 890 - 0065, Japan stagane29@gmail.com Author Dang, Van-Son 0000-0001-8681-4141 Institute of Life Sciences, Vietnam Academy of Science and Technology, 85 Tran Quoc Toan Street, District 3, Ho Chi Minh City, Vietnam dvsonitb@gmail.com Author Kongxaisavath, Deuanta 0009-0000-4559-0647 Faculty of Forest Science, National University of Laos, Dongdok Campus, Xaythany District, Vientiane Capital, Laos deuantar66789@gmail.com Author Yamamoto, Takenori 0000-0002-5487-6652 Kagoshima University Museum, Kagoshima University, 1 - 21 - 30, Korimoto, Kagoshima 890 - 0065, Japan t.yamamoto0624@gmail.com Author Souvannakhoummane, Keooudone 0000-0003-4875-8307 Faculty of Natural Science, National University of Laos, Dongdok Campus, Xaythany District, Vientiane Capital, Laos k.souvannakhoummane@nuol.edu.la Author Phonepaseuth, Phongphayboun Author Vongthavone, Thyraphon Author Sengthong, Anousone Author Trong, Pham Quoc 0009-0004-6879-7535 Institute of Life Sciences, Vietnam Academy of Science and Technology, 85 Tran Quoc Toan Street, District 3, Ho Chi Minh City, Vietnam phamquoctrong117@gmail.com Author Yamazaki, Kaito 0000-0001-5652-2551 Kagoshima University Museum, Kagoshima University, 1 - 21 - 30, Korimoto, Kagoshima 890 - 0065, Japan k.yamazakii0323@gmail.com text Phytotaxa 2025 2025-11-11 728 1 61 68 https://doi.org/10.11646/phytotaxa.728.1.6 journal article 314341 10.11646/phytotaxa.728.1.6 78b77559-a68b-4a1f-8410-a8d4454c414a 1179-3163 18416437

TABLE 1. Comparison of morphological characters between Grewia souladethiana, G. thailandica (Chantaranothai & Nualngam, 2022), and G. abutilifolia (Jussieu 1804, Phengklai 1993, Tang et al. 2007).

Characters	G. souladethiana	G. thailandica	G. abutilifolia
habit	trees, 3‒4 m tall	scandent shrubs to woody climbers	shrubs or small trees 1–5 m tall
Leaf blade size (cm)	8.7–18.9 × 2.9–6.0	13–18.5 × 5.5–10	3–20 × 2–15
Leaf acumen length (cm)	up to 2.8	up to 1	NA
Petiole length (cm)	0.6–0.9	1.0–1.3	1.2
Peduncle length (cm)	0.9–1.4 cm	0.5–1.2 cm	0.1–0.6
Inner bract length (mm)	2.0 × 3.0	ca. 1.5 × 10	NA
Sepal shape and length (mm)	oblanceolate, 18 × 3.0	lanceolate or oblong-lanceolate, 25–27 × 3.0–5.0	narrowly oblong to oblong, 6–8 × 2
Petal shape and size (mm)	triangular, 2.0 × 1.8	oblong or lanceolate, 8.0–9.0 × 3.0–4.0	oblong, ca. 2–3 × 2–3
Number of lobes on fruit	1–2	(1–)3–4	2–4
Texture of hairy on fruit	sparsely hairy	stellate hairy or glabrescent	Tomentose, hirsute
Seeds shape and size (mm)	depressed obovoid-globose, 4.0 × 7.0	obovoid, 12–15 × 10–12	NA