Taxillus rugosus Rajasek. in J. Swamy Bot. Club 3: 164, ff. 9 - 10. 1986.

Branches glabrous. Leaves opposite, broadly elliptic or ovate, cuneate at base, subacute at apex, 9 - 12 x 3.5 - 6 cm, crustaceous, glabrous; lateral nerves 4 or 5 pairs; petioles 10 - 12 mm long. Inflorescences axillary, compound dichasia; peduncle solitary, 5 - 7-flowered, 4 - 6 mm long, glabrous; flower buds spathulate, 1.5 - 1.7 cm long, glabrous. Flowers 4-merous, 2 - 2.5 cm long, glabrous; pedicels 3 - 5 mm long; bract suborbicular, 0.3 - 0.5 mm long. Calyculus obsolete. Petals 4, united; tube slightly ventricose at base, with median split up to half the length, 1.5 - 1.7 cm long; lobes 4, spathulate, 9 - 10 mm long. Stamens 4; filaments 1.5 - 2 mm long; anthers linear- oblong, recurved. Ovary cupular, 1.5 - 3 mm long, rugulose; style 4-gonous; stigma capitate, minutely papillate. Fruits not seen.

Fl. Jan.

Distrib. India: Assam and Mizoram.

Endemic.

Notes. Vessels with lateral perforations, pittings larger, elliptic-ovate; fibres thick-walled, broad-lumened with reduced pits without border.

Pollen 3-lobed; P - 30 (31.9) 34 µm; E - 44 (46.5) 50 µm; P/E - 0.70 µm; ex. 2 µm; col. 1 µm.