Octotropidae

Ordas, Jorge Anton D., Pinarok, Neil Alejandro A., Romeroso, Roanne B., Alejandro, Grecebio Jonathan D. & Banag-Moran, Cecilia I., 2019, A checklist of Rubiaceae species from Eastern Samar, Visayas, Philippines, Check List 15 (2), pp. 295-312 : 305

Tribe Octotropidae

Hypobathrum purpureum (Elmer) Merr., EPFP 3 (1923) 534.

Materials examined. Table 2.

Medium-sized shrub about 3 m high. Leaves lanceolate, 10–12 × 4 cm subcoriaceous, and glabrous. Inflorescences axillary, solitary or in few-flowered gla- brous cymes. Calyx turbinate, 2.5 mm. Corolla white, 2–3 mm. Fruits not seen.

Based on its original description, H. purpureum is characterized by having inflorescences with few- to many-flowered cymes. Our collection of this species in Eastern Samar has solitary or few-flowered axillary cymes. The morphology of this specimen, however, is highly similar overall. Similar individuals having solitary and few-flowered inflorescences were observed from the Province of Cagayan, Luzon ( Pelser et al. 2011).