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 4. Sohmaea teres (Wallich 1831: 196 ex Bentham 1852: 225 ) H.Ohashi & K.Ohashi (2018b: 163) . Fig. 2C–D . ≡ Desmodium teres Wallich ex Bentham Type:— MYANMAR . Taong Dong , Wallich 5694 ( lectotype K-W! K001121790 , designated by Rafidah et al. (2020) , isolectotypes BM! BM000946774, CAL, n.v. , G!, K! K000858870, K-W! K001121791). ≡ Meibomia teres (Wall. ex Benth.) Kuntze (1891: 198) . = Desmodium zonatum Meeuwen (1961: 97) , non Miq. (1855: 250). Specimen cited:— Dorgeh 1755 (L, n.v.), fide Ohashi (2004) . Herb, up to 2 m high; stems and twigs terete, sparsely to densely uncinate hairy. Leaves unifoliolate, alternately arranged; stipules narrowly triangular, 5–12 × 2–3 mm , apex long acuminate to caudate, surface glabrescent; petioles 0.3–0.8 cm long, ascending pubescent and minutely uncinate. Leaflets : stipels narrowly triangular, 2–5 × 0.5–1 mm , apex long acuminate, surface glabrescent, margin not fimbriate; petiolules 1.5–3 mm , ascending pubescent and uncinate hairy; leaf blade lanceolate to narrowly lanceolate or oblong, (3–)9–20 × (0.5–) 2.5–7 cm , apex attenuate, base obtuse, margin entire, upper surface nearly glabrous or sparsely uncinate hairy, with straight hairs on mid- and lateral veins, lower surface spreading uncinate hairy, with straight hairs on mid- and lateral veins; lateral veins 9–14 per side. Inflorescences 10–40 cm long, terminal or axillary; rachis densely uncinate hairy. Primary bract narrowly ovate, 3.5–4 × 1–1.5 mm , apex long acuminate to attenuate, surface pubescent, conspicuously veined, enclosing 5-immature flowers and secondary bract. Secondary bract narrowly ovate to narrowly triangular, 1.5–2 × 0.5 mm , pubescent. Flowers 6–7 mm long, 5-flowered fascicles; bracteoles absent; pedicels 4–5 mm long, densely uncinate and straight hairy (on lower half part). Calyx yellowish green, ca. 4 mm long, base cuneate; outside ascending pubescent and minutely uncinate, inside glabrescent, tube ca. 1.5 mm long; teeth 2–3 mm long, acuminate to needle-like at the apex, prominently longer than tube length, two lateral teeth shorter than others, lower tooth longest, upper one entire. Corolla standard white, wings and keels violet to blue; standard broadly obovate to oblanceolate, 4.5–8 × 3.5–5.2 mm , apex obtuse to rounded, base attenuate, not auriculate, claw 0.3–1 mm long; wings slightly oblong, 3.5–6 × 1–2 mm , apex obtuse, base auriculate, ca. 0.3 × 0.5 mm , claw 0.5–1 mm long; keels slightly curved, 4–7 × 1–1.5 mm , prominently longer than wings, apex acute to slightly obtuse, base shortly auriculate, claw ca. 2.5 mm long. Stamens 4–7.5 mm long; anthers ellipsoid, ca. 0.3 × 0.2 mm . Gynoecium 4.5–9 mm long; ovary oblong, laterally compressed, pubescent, stipitate, 0.5–1 mm long, 10–13-ovulate; style 1.5–3 mm long, pubescent; stigma minutely capitate. Pods light brown, indehiscent, 8–11-articulate, subterete, 4–6.5 cm long, 1–1.5 mm wide, surface densely uncinate, not reticulate-patterned (but longitudinal striate), both sutures less constricted between articles and thickened; isthmus ca. 4/5 as broad as the pod; articles narrowly oblong to linear, 5–6 mm long; pod stipe 1.5–2 mm long, glabrescent; fruiting pedicels 5–7 mm long, ascending pubescent and uncinate hairy. Seeds brown, transversely oblong, 4.5–5 × 1 mm , ca. 0.7 mm thick. Distribution :— Myanmar , Thailand , Malaysia , and Indonesia . Ecology :—In sunny places of limestone mountain and evergreen, dry evergreen, and mixed deciduous forests; 50–700 m elev. Phenology :—Flowering in September–November. Fruiting in October–January. Notes :— Sohmaea teres is a new record species for Cambodia . Specimens examined :— THAILAND . Chiang Mai : Mae Rim , QBG, BGO. Staff 4828 ( QBG-2 sheets), Doi Chiang Dao , 480 m , 21 Oct. 1955 , Garrett 1460 ( K , L , P-2 sheets), Doi Chiang Dao , 600–1300 m , 25 Sept. 1971 , Murata et al. T-14911 ( KYO ) , Doi Chiang Dao , 600–1300 m , 25 Sept. 1971 , Murata et al. T-14936 ( KYO ) , Chiang Dao , Ban Bing Kong , 500 m , 29 Oct. 1987 , Maxwell 87-1304 ( CMU , L ) , Doi Suthep , 630 m , 17 Oct. 1999 , Srapratet 24 ( CMUB ) , Fang , Doi Pha Hom Pok National Park , 21 Dec. 2014 , Saisorn 352 ( KKU ) , Mae Rim , QSBG, 860 m , 13 Nov. 2014 , Tanming 732 ( QBG ) & Chiang Dao , Tham Chiang Dao , 350 m , 15 Feb. 1958 , SØrensen et al. 1137 ( C ) ; Chiang Rai : Doi Pha Hom Pok , 700 m , 15 Sept. 1967 , Iwatsuki et al. T-9724 ( KYO ) & Pan , Doi Luang National Park , 610 m , 3 Nov. 2015 , Muangyen 214 ( QBG ) ; Phayao : Mae Chai , Doi Luang National Park , 800 m , 4 Nov. 2015 , Muangyen 318 ( QBG ) , Doi Luang National Park , 600 m , 4 Nov. 2015 , Muangyen 327 ( QBG ) & Mueang Phayao , Doi Luang National Park , 575–625 m , 25 Sept. 1997 , Petrmitr 123 ( BKF , CMUB ) ; Nan : Tham Pha Tok , 250 m , 16 Nov. 1993 , Larsen et al. 44405 ( AAU ) ; Lampang : Chae Hom , 325 m , 26 Oct. 2012 , Maxwell 12-279 ( CMUB , QBG ) , en route from Pang La to Huai Tak , 350 m , 24 Sept. 1967 , Shimizu et al. T-10752 ( BKF , KYO ) & without locality, 250 m , 22 Nov. 1922 , Winit 811 ( ABD , BK , K ) ; Sukhothai : Si Satchanalai , Ban Mae San , 17 Nov. 2015 , Maknoi 8391 ( QBG ) & Ban Mae San , 28 Jan. 2016 , Maknoi 8514 ( QBG ) ; Nakhon Sawan : Ban Na Kluay , 50 m , 7 Nov. 1924 , Kerr 4537 ( ABD , BK , BM , E , K ) ; Phetchabun : Nam Nao National Park , 3 Nov. 2013 , Mattapha 448 ( KKU ) & Nam Nao National Park , 18 Oct. 2004 , Mattapha 696 (KKU-2 sheets) ; Loei : Pha Nok Khao , 250–350 m , 6 Dec. 1970 , Charoenphol et al. 4564 ( AAU , BKF , C ) & Wat Tham Pha Sawan , 381 m , 14 Nov. 2011 , Clark et al. 240 ( K , QBG ) ; Khon Kaen : Phu Pha Man National Park , 25 Oct. 2007 , Norsaengsri & Lakoet 2807 ( QBG ) , Phu Pha Man National Park , 410.6 m , 22 Nov. 2007 , Norsaengsri & Lakoet 3069 ( QBG ) , Phu Pha Man National Park , 467 m , 24 Dec. 2011 , Norsaengsri & Tathana 8403 ( QBG ) , Wiang Kao , Phu Wiang National Park , 11 Nov. 2014 , Saisorn et al. 294 ( KKU ) , Wiang Kao , Phu Wiang National Park , 15 Feb. 2015 , Saisorn 376 ( KKU ) , Chum Phae , Dong Lan , 300 m , 22 Nov. 1958 , Smitinand 4919 ( BKF , L ) & Chum Phae , Dong Lan , 400 m , 22 Dec. 1958 , SØrensen et al. 6122 ( C ) ; Nakhon Ratchasima : Pak Chong , 600–650 m , 20 Nov. 1982 , Koyama et al. T-30147 ( KYO ) , Pak Chong , 700–730 m , Koyama et al. T-30094 ( KYO ) & without locality, 18 Dec. 1962 , Phengklai 584 ( C , K , L ) ; Kanchanaburi : Wang Po , 26 Oct. 1969 , Kasem 648 ( BK , L , SING ) , Srisawat , 580–600 m , 26 Nov. 1982 , Koyama et al. T-30304 ( KYO ) , Sai Yok , Mahidol University Kanchanaburi Campus , 225 m , 20 Dec. 2005 , Maxwell 05-739 ( CMUB ) , Si Sawat , Ban Khao Lek , 500–600 m , 21 Oct. 1994 , Nisit 94102118 ( BK ) , Si Sawat , Ban Khao Kaeng Khaep , 500 m , 2 Nov. 1979 , Shimizu et al. T-21399 ( BKF , KYO , L ) , Si Sawat , Erawan National Park , 100–300 m , 3 Nov. 1979 , Shimizu et al. T-21540 ( BKF , KYO ) , Si Sawat , Erawan National Park , 100–300 m , 3 Nov. 1979 , Shimizu et al. T-21567 ( KYO ) , Sai Yok , 160 m , 6 Nov. 1979 , Shimizu et al. T-21760 ( BKF , KYO ) , Sai Yok , Near Sai Yok Arboretum , 160 m , 6 Nov. 1979 , Shimizu et al. T-21829 ( KYO ) & Si Sawat , 150 m , 5 Nov. 1971 , van Beusekom et al. 3413 ( BKF , C , K , KYO, L-2sheets, P ) ; Prachuap Khiri Khan : Kui Buri , Sam Roi Yot , 23 Oct. 1973 , Sutheesorn 2703 ( BK ) ; Lop Buri : Chai Badan , 280 m , 4 Dec. 1982 , Koyama & Terao T-30595 ( BKF , KYO ) & Subchampa Hill , 170–190 m , 19 Nov. 1984 , Murata et al. T-50933 ( BKF , KYO ) ; Saraburi : Muek Lek , 200 m , 10 Nov. 1924 , Marcan 1867 ( ABD , BK , BM , KKU ) ; Chon Buri : Si Racha , Khao Khiao , 300 m , 18 Dec. 1974 , Maxwell 74-1077 ( BK ) & Si Racha , Khao Khiao , 100 m , 20 Oct. 1975 , Maxwell 75-1052 ( AAU , BK , L ) ; Chanthaburi : Pong Nam Ron , 700 m , 11 Oct. 1955 , Sangkhachand 528 ( BKF , L ) , Pong Nam Ron , Ban Thalee , 200 m , 24 Oct. 1956 , Smitinand 3616 ( BKF ) & without locality, 200 m , 28 Nov. 1956 , Smitinand 3648 ( BKF , L ) ; LAOS . Luang Prabang : Massie s.n ( Dy Phone et al. , 1994); CAMBODIA . Mondulkiri : Sen Monorom , 527 m , 5 Nov. 2016 , Yahara et al. 7382 ( FU ) ; VIETNAM . Annam : Ca-na , Phanrang , 500 m , 22 Nov. 1923 , Poilane 8652 (P-2 sheets) .