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Thismia nigricoronata, a new species of Burmanniaceae (Thismieae, Dioscoreales) from Vang Vieng, Vientiane Province, Laos, and a key to subgeneric classification

. Phytotaxa. 319, 3 (Sep. 2017), 225–240. DOI:https://doi.org/10.11646/phytotaxa.319.3.2.