Henckelia collegii-sancti-thomasii

Dark Henckelia is a newly discovered (2019) terrestrial erect herb, with stems 8-20 cm long, round, velvet-hairy, green. Flowers are borne in leaf-axils or apparently at branch-ends, 1-10 flowers from each axil. Flower-cluster-stalk is 1.8-2.5 cm long. Bracts are 2, 0.5-0.6 x 0.3-0.4 cm, ovate, tip pointed. Flower-stalks are 1.7-3.3 cm long. Sepal-cup is 2.3-2.7 x 1.3-1.5 cm, 5-lobed, divided near to base or divided from below the middle, 1.6-1.9 x 0.3-0.4 cm, linear lanceshaped, tip pointed, pale green, wooly outside and hairless within. Flowers are 5-5.5 cm long, funnel-shaped, white, deep violet-purple towards tip with yellow-orange throat, velvet-hairy outside and glandular hairy inside. Flowers are bi-lipped, upper lip 2, lower lip 3, deep violet-purple, lower lip bases with yellow color and two orange yellow lines with purple streaky margins towards the throat, lobes ovate with rounded tip, velvet-hairy outside and glandular hairy within; flower tube 3.3-3.8 cm, white with orange-yellow towards throat, velvet-hairy outside and glandular hairy within. Stamens are 2, 1-1.3 cm long, staminodes 2, with anther-like tip, 0.5-0.7 cm long. Pistil is 2.9-3.1 cm long, pale green. Leaves are 11-26 cm long, opposite decussate, leaf-stalks 3-6 cm long, velvet-hairy, green. Blades are 10-23 x 4.2-12 cm, ovate-lanceshaped, oblique, tip pointed to tapering, base asymmetric and oblique, wedge-shaped, margin rounded toothed, dark green above and pale beneath, lateral veins 8-12 on each side, blade velvet-hairy on both sides. Capsules are 6.3-7 cm long, linear. Dark Henckelia is endemic to Arunachal Pradesh. Flowering: August-December.