Argostemma maquilingense Elmer, LPB

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 : 300-301

Argostemma maquilingense Elmer, LPB 9 (1934) 3242.

Materials examined. Table 2.

Small herb about 5–7 cm high. Leaves oblong to

obovate, 3 × 1–2 cm, very membranous, glabrous on both sides, except for midrib that is somewhat puberu- lent. Infructescences solitary or in 2 to 3 fruits, terminal. Flowers not seen. Fruits globose to subglobose, 4 mm in diameter, crowned with calyx remnants, green.

Named after its type locality on Mount Makiling, Laguna, this species is also reported on Mount Bulusan, Sorsogon, on the island of Luzon north of Samar. The species is known to be ecologically restricted to wet, mossy forest summits. Hence, our new observation represents a new occurrence of this species, inhabiting moist, lowland rainforests.