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 J.St.-Hil. (1812: 192) . Type species: P. gangeticus (L. 1753: 746) J.St.-Hil. (1812: 192) . Desmodium sect. Heteroloma Benth. (1852: 224) [unranked] Latifolia Benth. (1852: 224), pro parte. Type species: D. gangeticum (L.) DC. (1825b: 327) ( lectotype , designated by Ohashi et al. (2018b)). Herbs. Leaves unifoliolate, petiolate, stipulate; leaflet petiolulate, stipellate, lateral veins reaching the margin. Inflorescences terminal or axillary; primary bract 1, persistent, narrowly triangular; secondary bract 1, persistent. Flowers papilionaceous, pedicellate; bracteole absent; calyx connate with 4 teeth; corolla 5-merous, with 1 standard, 2 wings and 2 connate keels; stamens 10, diadelphous; ovary unicarpellate, oblong, laterally compressed. Pods leguminous, with a deep, constricted article; seeds rim-arillate. Six species distribute in tropical Africa, Madagascar , Mascarene Islands, Asia, and Australia . One species is indigenous to Myanmar , Thailand , and Cambodia . Another species is native to those three countries, Laos , and Vietnam . Key to the species 1. Primary bracts bearing 2-fascicled flowers. Pedicels less than 3 mm long. Flowers 2–2.5 mm long; stamens less than 4.5 mm long...............................................................................................................................................................................1. P. flexuosus 1. Primary bracts bearing 3–4-fascicled flowers. Pedicels at least 3 mm long. Flowers ca. 4 mm long; stamens 4.5–5 mm long ......... ..................................................................................................................................................................................... 2 P. gangeticus