A revision of Microchirita in Thailand 
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Bull., Bot. 29: 87 (2001). - TYPE: Thailand, Maeklang Falls, c. 50 km Northwest of 
Chiang Mai, c. 430 m, 3 November 1967, Burtt, B.L. 5611 (holotype E [E00155280]). 
(Fig. 4) 
Caulescent herb to 50 cm tall, internodes 2-10 cm. Stems succulent, green or brown, 
glabrous or glabrescent, unbranched. Leaves opposite, apart from the basal leaf; 
petioles 0.2-1.5(-2.5) cm long, eglandular hairy; blades mid green above, pale green 
beneath, lanceolate or ovate, 3.2-16.6(-30+) x 1.4—9.5(—19) cm (measures in bracket 
refer to estimate measurements of incomplete basal leaves), 1.4-2.8 times as long 
as wide, base cordate, rounded or seemingly shortly attenuate, apex acuminate or 
acute, eglandular hairy above and beneath, not ciliate along the margin, margin entire, 
8-15 pairs of secondary veins, venation slightly sunken above and raised beneath in 
fresh material, flat in dry specimens, tertiary venation laxly reticulate. Inflorescences 
cristate, peduncles reduced or emerging to 15 mm long and fused together; bracts 
absent; pedicels green to reddish brown, 5-20 mm long, eglandular hairy. Calyx pale 
to mid green, regular, succulent at base, tube 0.3-1 mm, lobes narrowly lanceolate 
to elliptic, 5-10 x 0.7-1.8 mm, apex acute, margin irregularly entire, occasionally 
toothed, hairy on midrib, margin and tip outside, glabrescent or glandular inside. 
Corolla c. 21 mm long, bright yellow with a reddish brown patch ventrally inside, 
sometimes split into two lateral patches, throat greenish yellow, narrow part of the 
tube curved, then widening, upper lobes spreading, base of tube glabrous, broader part 
sparsely eglandular hairy, lower lobes papillose, upper lobes and throat with scattered 
glandular hairs; tube 10.5-18 mm long dorsally, 12-19 mm ventrally, 10.5-15 mm 
laterally between lips; lobes elliptic, apices rounded, upper lobes 1-4 x 2.5-5.1 mm, 
lateral lobes 2.5-5 x 3.3-6 mm, ventral lobe 2.3-5.2 x 2.5-7.5 mm. Stamens arising 
5-11 mm above the corolla base; filaments straight, pale green, glabrous, 2-2.6 mm 
long, c. 0.2-0.6 mm wide; anthers hairy dorsally, 1.1-2 x 0.6-1.1 mm, apically joined 
by a connective, thecae subparallel; lateral staminodes 0.6-1.5 mm long, arising 3-6.5 
mm above the corolla base, central staminode 0.4-0.5 mm long, arising 7-8 mm 
above the corolla base. Disk annular or cleft dorsally, margin entire, 0.2-0.9 mm high. 
Pistil 11.5-15 mm long; ovary 2-6 mm long, papillose at the base, apically eglandular 
hairy; style 5-7.5 mm long, pubescent, eglandular in the bottom half, becoming 
predominantly glandular in the top half; stigma glabrous, 0.5-1.1 mm long. Fruit 
green, 1.5-5 cm long, 1.2-2 mm diameter, glabrous with sparse pubescence at the tip 
(where the persistent style starts), usually curved at maturity, occasionally straight. 
Seeds brown, narrowly elliptic, 0.3-0.4 x c. 0.1 mm. 
Distribution. Northern and Northeastern Thailand. Laos, India. Likely also to be in 
Myanmar. 
Habitat. On limestone in deciduous forest. 
Provisional IUCN conser\>ation assessment. Least Concern LC. This species is known 
over a wide area and from many localities within Thailand. Its distribution in Myanmar 
