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24a. Corolla with dark spots at the base of the upper lobes.25. M. tetsanae 
24b. Corolla with dark spots at the base of the lateral lobes.25 
25a. Corolla ventral lobe < 5 mm long, overall corolla length 12-18 mm long, lobes 
white.12. M. karaketii 
25b. Corolla ventral lobe > 5 mm long, overall corolla length 17-25 mm long, lobes 
white or yellow-white.26 
26a. Corolla with yellow-white lobes and yellowish throat in addition to the ventral 
yellow line and lateral markings; anthers with a strongly dimorphic indumentum 
.29. M. woodii 
26b. Corolla with pure white lobes and white in throat in addition to the ventral 
yellow line and lateral markings; anthers with only one type of hairs. 
.27. M. tubulosa 
27a. Anther indumentum of two distinct hair types.28 
27b. Anther indumentum of a single hair type.30 
28a. Filaments glabrous. 2.M. albocyanea 
28b. Filaments eglandular hairy.29 
29a. Calyx 7.5-13 x 1.2-1.7 mm, apex acute; corolla yellow.17. M. micromusa 
29b. Calyx 4.5-8 x 1-1.2 mm, apex acuminate; corolla white or purple-blue. 
.25. M. tetsanae 
30a. Corolla pale yellow.24. M tadphoensis 
30b. Corolla white, lilac, purple or blue.31 
31a. Corolla with a ventral yellow or orange stripe.32 
31b. Corolla without a yellow ventral stripe.33 
32a. Corolla with a narrow tube abruptly opening up into spreading lobes, corolla 
white or blue, with a fringe of glandular hairs at the base of the upper lobes 
[Chaiyaphum, Loei].10. M. hypocrateriformis 
32b. Corolla broadly campanulate, white to pale lilac except at very base of tube, 
with short stalked glands not forming an obvious fringe [Kanchanaburi]. 
.8. M. hemratii 
33a. Corolla 18-33 mm long; leaves softly tomentose [Peninsular Thailand]. 
.18. M. mollissima 
33b. Corolla 10-13 mm long; leaves sparsely eglandular hairy [Northern Thailand] 
.23. M. suddeei 
