Rhynchotechum calycinum - White Rhynchotechum

White Rhynchotechum is an undershrub with stems up to 1 cm in diameter. Flowers are borne in 4-5 cm long, 4-branched dense clusters, which are virtually stalkless. Flowers are white, exterior hairless; upper lip 6-6.5 x 5.5 mm; upper petals 2 x 2 mm, tips rounded to blunt; lower lip 6-6.5 x 6.5 mm; lower petals 2.5-3 x 2 mm, tips rounded to blunt; tube 4.5 mm long. Sepals are triangular to linear tapering, tips pointed to blunt, 5-6 x 1.25-1.75 mm, hairless. Axis is nearly hairless to slightly short yellow hairy; bracts triangular to linear. Leaves are opposite, carried on leaf-stalks 5-6.5 cm long; blade elliptic, up to 24 x 8.5 cm, 2.8 times as long as wide, tip likely tapering, base narrowly wedge-shaped; margin entire to slightly finely toothed, the teeth up to 0.5 mm long; secondary vein pairs 14-15; above dark green, hairless; below pale green, hairless. Fruit is ellipsoid, 2.5-2.75 x 2-2.25 mm, hairless. White Rhynchotechum is native to Northeast India, growing on the margins of primary forest, often in moist and shady conditions, along streams at altitudes of 400-600 m. Flowering: October-February.