A taxonomic revision of two genera, Pleurolobus and Sohmaea (Leguminosae) in Thailand and Indo-China Author Saisorn, Witsanu School of Science, Walailak University, Nakhon Si Thammarat 80161, Thailand. Author Chantaranothai, Pranom Department of Biology & Centre of Excellence on Biodiversity (BDC), Faculty of Science, Khon Kaen University, Khon Kaen 40002, Thailand. text Phytotaxa 2022 2022-11-23 573 2 231 246 http://dx.doi.org/10.11646/phytotaxa.573.2.4 journal article 194617 10.11646/phytotaxa.573.2.4 80d52cdf-fbd6-4aa4-b9f1-c6e8ac9dc473 1179-3163 7349951 1. Pleurolobus flexuosus (Wallich 1831: 195 ex Bentham 1852: 224 ) H.Ohashi & K. Ohashi (2018c: 386) . ≡ Desmodium flexuosum Wall. ex Benth. Type:— MYANMAR . Montes Prome , 1826, Wallich 5691 ( lectotype K-W! K001121777 , designated here, isolectotypes G!-2 sheets, BM!, K! K000858866, CAL, n.v. ) . ≡ Meibomia flexuosa (Wall. ex Benth.) Kuntze (1891: 198) . Creeping herb; stems and twigs angular or subterete, brown pubescent. Leaves subalternately or spirally arranged; stipules, narrowly triangular, 5–10 × 1–1.5 mm , apex acuminate, surface long pubescent; petioles (0.3–) 1.5–3.5 cm long, densely erect pubescent. Leaflet coriaceous; stipels narrowly triangular to filiform, 2–5 mm long, apex pointed, surface glabrescent to pubescent; petiolules 1–3 mm , densely pubescent; leaf blade cordate, broadly obovate to broadly elliptic, 1.5–6.5 × 1.5–6 cm , apex ±acute to rounded or shallowly emarginate, base ±cordate, margin entire, upper surface glabrescent, lower surface appressed pubescent, denser than upper surface; lateral veins 7–9 per side. Inflorescences pseudoracemose or paniculate, with a few branches, 5–15 cm long; rachis and rachilla densely pubescent and minutely uncinate. Primary bract 3–7 × 0.5 mm , apex pointed, surface long pubescent, enclosing 2-immature flowers and secondary bract. Secondary bract persistent, narrowly triangular, ca. 1 × 0.3 mm , pubescent. Flowers 2–2.5 mm long, 2-flowered fascicles; pedicels 2–2.5 mm long, with uncinate hairs. Calyx 1.5–2 mm long, base obtuse; outside white pubescent, tube ca. 1 mm long; teeth 4, 0.8–1 mm long, ±equal to tube length, upper tooth shallowly divided, less than 0.2 mm long. Corolla : standard broadly obovate, ca. 3 × 3 mm , apex shallowly emarginate, base attenuate, entire or slightly auriculate at base, claw very short; wings ca. 3 × 1.2 mm , ±equal to the keel petals, apex obtuse, base not auriculate, claw ca. 0.5 mm long; keels curved, ca. 3.2 × 1.5 mm , the broadest part near the apex, apex obtuse, base not auriculate, claw ca. 1.5 mm long. Stamens ca. 3 mm long. Gynoecium ca. 3.5 mm long; ovary appressed pubescent; style ca. 1.5 mm long, glabrescent; stigma minutely capitate. Pods dark brown to black, 3–4-articulate, straight, 7–10 × 2–2.5 mm , surface sparsely uncinate, inconspicuously reticulate-patterned, upper suture undulate, lower suture more constricted than upper suture, ca. 1 mm deep; isthmus 2/5 as broad as the pod; articles obliquely ovate or subcircular, ca. 3 mm long; pod usually sessile or shortly stipitate, ca. 0.5 mm long; fruiting pedicels 2.5–3 mm long, with uncinate hairs. Seeds transversely elliptic. Distribution :— Myanmar , Thailand , and Cambodia . Ecology :—In teak plantation, with bamboo and deciduous forests; 30–400 m elev. Phenology :—Flowering in November. Fruiting in November–February. Notes :— Two specimens, Maxwell 06-874 (CMUB) and Pierre 1006 (P) are newly recorded for Cambodia . Desmodium flexuosum Wall. ex Benth. was validly published. Five original specimens were examined at BM, G, K, and K-W by authors and one duplicate was recorded by Ohashi (1973) . All specimens are from the same gathering and in a perfect condition. A specimen kept at K-W ( K001121777 ) is selected here as the lectotype because it is well preserved in Wallich’s collection at Kew. Specimens examined :— THAILAND . Chiang Mai : Doi Suthep , 1100 m , 17 Oct. 1910 , Kerr 1480 ( ABD , BM , C , K-2 sheets, L , P ), Doi Suthep , 1200 m , 28 Nov. 1911 , Kerr 1480B ( BM , E , K , L , P ) & Doi Suthep-Pui National Park , 350 m , 19 Dec. 1989 , Maxwell 89-1568 ( CMU , E , L ) ; Lampang : Chae Son , Ban Sa , 400 m , 7 Nov. 2008 , Maxwell 08-198 ( CMUB ) ; CAMBODIA . Kratie : Sambour , Mekong River , 30 m , 15 Nov. 2006 , Maxwell 06-874 ( CMUB ) & May 1870 , Pierre 1006 ( G , P ) .