FIGURE 5. Thismia nigricoronata. A in Thismia nigricoronata, a new species of Burmanniaceae (Thismieae, Dioscoreales) from Vang Vieng, Vientiane Province, Laos, and a key to subgeneric classification

FIGURE 5. Thismia nigricoronata. A. Whole plant in longitudinal section showing the internal parts (fa, flagellate appendage; ipl, free part of inner perianth lobe; an, annulus; upt, upper part of perianth tube; al, anther locule; opl, free part of outer perianth lobe; co, connective; lpt, lower part of perianth tube; th, thecae; st, stigma). B. Whole plant showing the mitre. C. Whole plant showing the upper part of perianth tube. D. Staminal tube showing anther locules and connectives. E. Longitudinal section of the perianth tube showing stamen and ovary. F. Mitre. (Drawn by P. Kumar from preserved specimen HNL-KFBG 0099.)