Phialanthus oblongatus Urb.

Phialanthus oblongatus Urban, Symb. Ant. 9: 161. 1923
A small tree, the younger branches quadrangular, minutely spreading-pilose, resinous, the internodes 1-3 mm. long; stipule-sheath 1 mm. long, truncate; petioles 1 mm. long; leaf-blades oblong or elliptic-oblong, broadest at or near the middle, 8-15 mm. long, 3-6 mm. wide, rigidcoriaceous, rounded at the apex, narrowed to the petiole, scarcely lustrous above, the costa prominulous or sulcate, the nerves obsolete, the margin revolute, paler beneath; inflorescences subsessile, 3-flowered, the involucre 2 mm. long, the flowers sessile, 4-parted; hypanthium narrowly cylindric, slightly attenuate below; calyx-lobes broadly linear or spatulate-linear, obtuse, 1.5 mm. long, 0.6 mm. wide; corolla 3.5 mm. long, the tube turbinate, the lobes ovate, obtuse, half as long as the tube; stamens inserted above the base of the corolla, long-exserted, the filaments 4.8 mm. long, the anthers oval, 1 mm. long; style 5 mm. long, slightly thickened at the apex.
Type locality: Thickets in eruptive soil. El Paraiso, near Holguin, Oriente, Cuba. Distribution: Known only from the type locality.

Phialanthus oblongatus là một loài thực vật có hoa trong họ Thiến thảo. Loài này được Urb. miêu tả khoa học đầu tiên năm 1923.