Sohmaea laxiflora subsp. lacei (Schindl.) W.Saisorn & Chantaranothai, 2022

Saisorn, Witsanu & Chantaranothai, Pranom, 2022, A taxonomic revision of two genera, Pleurolobus and Sohmaea (Leguminosae) in Thailand and Indo-China, Phytotaxa 573 (2), pp. 231-246 : 239-240

3.1 Sohmaea laxiflora subsp. lacei (Schindl.) W.Saisorn & Chantaranothai , comb. nov.

≡ Desmodium lacei Schindler (1926: 261) .

Type:— MYANMAR. Taungngu , Saing Yani Reserve, 500 ft. elev., 14 Dec. 1909, Lace 5027 (holotype K! K000858871 , isotype E! E00301249) .

≡ Desmodium laxiflorum subsp. lacei (Schindl.) H. Ohashi (1973: 103) .

≡ Sohmaea lacei (Schindl.) H.Ohashi & K.Ohashi (2018b: 162) .

Distribution:— India, Myanmar, and Thailand.

Ecology:—Deciduous forest, on limestone soil; 500–550 m elev.

Phenology:—Flowering in September. Fruiting in September–December.

Notes:—This subspecies differs from the typical subspecies in a number of leaflets and upper tooth of calyx. Other morphological characters are very similar to each, especially inflorescence type, calyx, corolla, staminal tube, fruit, and seed. This taxon is therefore treated under Sohmaea laxiflora .

Specimens examined:— THAILAND. Lamphun: Mae Tha, Doi Khun Tan National Park , 29 Sept. 1994, Maxwell 94-1055 ( BKF, CMUB, L) ; Tak: Umphang, Thi Lo Su waterfall, 8 Oct. 2014, Mattapha 266 ( KKU) , Mae Sot, Wat Tham Manora , 11 Sept. 2009, Middleton & Triboun 4855 ( BKF) & Mae Ramat, Mae Sot-Tha Song Yang Road , 6 Nov. 2010, Pooma et al. 7531 ( K) .