A revision of Microchirita in Thailand 
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7. Microchirita hamosa (R.Br.) Yin Z.Wang, J. Syst. Evol. 49: 60 (2011). - Chirita 
hamosa R.Br., Cyrtandreae 117 (1839); Barnett, FI. Siam. 3: 224 (1962); Wood, Notes 
Roy. Bot. Gard. Edinburgh 33: 191 (1974); Burtt, Thai Forest Bull., Bot. 29: 87 (2001). 
- TYPE (conserved - see Middleton & Puglisi, 2015): Thailand, Tak, Umphang, 
Umphang [Doi Hua Mot] Wildlife Sanctuary, 915 m, 17 October 2014, Middleton, 
D.J., Hemrat, C., Karaket, P., Puglisi, C. & Suddee, S. 5762 (holotype E; isotypes 
BKF, SING). (Fig. 3C-F) 
Caulescent herb to 25 cm tall; internodes 3-6 cm, although more often than not 
appearing as a unifoliate plant. Stems fleshy, with long eglandular hairs, pale green 
or sometimes tinged with purple-brown. Leaves opposite, except for the single basal 
cotyledon; petioles 0.1-0.5 cm long, densely hairy; blades green above, pale green 
beneath, ovate to lanceolate, 2-13.3 x 1.1-9.3 cm, 1.2- 2.1 times as long as wide, 
base of macrocotyledon/basal leaf cordate, cauline leaves shortly attenuate, apex 
acute, densely eglandular tomentose above and beneath, margin entire or subentire, 
6-12 pairs of secondary veins, venation slightly sunken above and raised beneath in 
fresh material, tertiary venation laxly reticulate. Inflorescences cristate, few to many 
flowered; peduncles to 4 mm long, not fused with each other; bracts absent; pedicels 
pale green, 3-20 mm long, all axes with long eglandular hairs. Calyx green, regular, tube 
0.1-0.3 mm, lobes narrowly lanceolate, 3-4.5 x 0.4-0.7 mm, eglandular hairy outside, 
glabrous inside except at the tip, apex acuminate, margin entire. Corolla 8.5-13 mm, 
white with a yellow stripe ventrally in tube, tube tubular, not curved downwards, lobes 
not spreading, outside eglandular hairy, glabrescent, becoming densely eglandular 
hairy towards the lobes, inside densely glandular, especially on lobes; tube 8-9 mm 
long, equal dorsally, laterally and ventrally; upper lobes 0.7 x 1 mm, lateral lobes 
1.1 x 1.1 mm, lower lobe 1 x 0.7 mm. Stamens arising c. 3.9 mm above the corolla 
base; filaments white or pale yellow, straight, glabrous, c. 1.5 mm long, 0.1 mm wide; 
anthers white or pale yellow, glabrous, 0.6-1.1 x 1-2 mm, free, thecae divergent; 
staminodes not seen. Disk a single ventral lobe, 0.1 mm. Pistil c. 16 mm long; ovary c. 
14 mm long, c. 0.7 mm diameter, glabrous or papillose in lower 1/3, densely pubescent 
in upper 2/3, many ovules; style c. 3 mm long, densely pubescent; stigma shallowly 
bilobed, c. 0.2 mm long. Style and stigma green to white. Fruit green, 1.2-2 cm long, 
1-1.2 mm diameter, glabrous at the base, then becoming densely eglandular hairy, 
straight or slightly curved. Seeds dark brown, elliptic, 0.2-0.3 x 0.1-0.2 mm. 
Distribution. Northern and Northeastern Thailand. India, China, Myanmar, Laos, 
Vietnam. 
Habitat. On limestone rocks or sandy soil in dry dipterocarp forest. 
Provisional IUCN conservation assessment. Least Concern LC. This species is 
common and widespread although could potentially be impacted by removal of 
limestone habitats for cement. 
