A revision of Microchirita in Thailand 
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13a. Corolla personate, upper lip greenish white and much smaller than lower lip. 
.20. M. personata 
13b. Corolla not personate, upper lip pure white and of similar size to lower lip .... 14 
14a. Corolla curved downwards and trumpet-shaped; fruit 2-5 cm long, sparsely 
hairy.1. M. albiflora 
14b. Corolla not curved downwards and tubular; fruit 1.2-2 cm long, densely hairy 
.7. M. hamosa 
15a. Corolla with obvious dark markings either at the base of the lateral lobes, at the 
base of the upper lobes, or deeper inside the throat.16 
15b. Corolla without obvious dark marking and fairly uniform in colour.27 
16a. Calyx with glandular hairs outside.9. M. huppatatensis 
16b. Calyx without glandular hairs outside.17 
17a. Corolla lobes lilac, violet, purple or blue.18 
17b. Corolla lobes white, yellow or orange.20 
18a. Elongated glands present inside sinus of upper corolla lobes; anthers coherent 
but not apically joined by a connective [Peninsular Thailand].28. M. viola 
18b. Elongated glands absent inside sinus of upper corolla lobes; anthers apically 
joined by a connective [SE, N and NE Thailand].19 
19a. Corolla tube gradually flaring, not abruptly widening, lobes spreading, 
predominantly whitish, pale yellow or blue [N & NE Thailand]... 25. M. tetsanae 
19b. Corolla tube of a distinct narrow lower tube and abruptly widening into a 
campanulate upper tube, lobes not spreading, predominantly dark purple 
[Chanthaburi].21. M. purpurea 
20a. Corolla bright yellow with an obvious dark ring inside the throat. 
.19. A/, oculata 
20b. Corolla lobes white, yellow or orange without a dark ring in throat.21 
21a. Corolla 32-45 mm long, lobes orange.16. M. marcanii 
21b. Corolla 12-30 mm long, lobes white or pale to bright yellow.22 
22a. Corolla lobes predominantly bright yellow.23 
22b. Corolla lobes predominantly white to very pale yellow or cream.24 
23a. Ventral corolla lobe 8-10 x 6.5-10 mm; filaments geniculate or twisted so as to 
appear divided into two halves.5. M. elphinstonia 
23b. Ventral corolla lobe 2.3-5.2 x 2.5-7.5 in in : filaments straight and uniform. 
.4. M. bimaculata 
