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3a. Bracts fused at the base; leaves with dense short glandular hairs and long 
eglandularhairs. 6.M. glandulosa 
3b. Bracts free; leaves with only eglandular indumentum.11. M. involucrata 
4a. Corolla 32-45 mm long, lobes orange.16. M marcanii 
4b. Corolla 16.5-33 mm long, lobes white to purple or blue.5 
5a. Leaves sessile to shortly petiolate, < 2.5 cm long; leaf blades 2.2-7.2 times as 
long as wide, with a silvery white “soft” indumentum; stems with indistinct 
internodes.18 .M. mollissima 
5b. Leaves with petioles 2-10 cm long; leaf blades 1.5-2.7 times as long as wide, 
with a hispid “rough” indumentum; stems with well-defined internodes. 
.22. M. rupestris 
6a. Glandular hairs present on pedicels and/or peduncles in addition to any 
eglandular indumentum.7 
6b. Glandular hairs not present on pedicels and/or peduncles in addition to any 
eglandular indumentum.10 
7a. Corolla lobes pale yellow; calyx lobes 14-17 mm long.15. M. luteola 
7b. Corolla lobes blue or purple; calyx lobes 4.5-15 mm long.8 
8a. Corolla with two spots inside the lateral lobes; calyx lobes 13-15 mm long. 
.3. M. aratriformis 
8b. Corolla without spots inside the lateral lobes; calyx lobes 4.5-8.5 mm long.9 
9a. Corolla tubular, widening abruptly; upper lobes dark purple at base. 
.26. M. thailandica 
9b. Corolla with a narrow lower tube which broadens into a campanulate upper 
tube; upper lobes without a dark patch.14. M. limbata 
10a. Anthers glabrous.11 
10b. Anthers hairy.15 
11a. Corolla >18 mm long, with a patch of elongated glands internally between the 
upper lobes.18. M. mollissima 
lib. Corolla <15 mm long, without a patch of elongated glands between the upper 
lobes (but sometimes with shorter and more evenly distributed glands on the 
upper lobes).12 
12a. Corolla with a broadly campanulate upper tube, lobes very pale lilac. 
.13. M. lilacina 
12b. Corolla with an upper tube which is not campanulate, lobes (at least the lower) 
pure white.13 
