1	Inflorescences thyrses in a raceme; fruit apex rounded	P.racemosa
–	Inflorescences thyrses in a panicle; fruit apex emarginate	2
2	Corolla and calyx lobes ligulate, undifferentiated, not overlapping, ca. 1.0 × 0.2–0.4 mm, glabrous, margins entire; style in fruit 1.0–1.4 mm, usually persistent; inflorescences glabrous	P.arisanensis
–	Corolla and calyx lobes triangular, slightly differentiated, calyx lobes ca. 1.0 × 0.5–0.6 mm and overlapping corolla lobes, corolla lobes ca. 0.5–1.2 × 0.3–1 mm, margins of both calyx and corolla lobes minutely denticulate; style in fruit ca. 0.2 mm, often deciduous; inflorescences sparsely tomentose	3
3	Leaf blades thinly coriaceous, margins entire; stems conspicuously lenticellate	P.moluccana
–	Leaf blades chartaceous, margins serrate; stems not conspicuously lenticellate	4
4	Flowers 4-merous; inflorescences 5–10 cm with basal portion before first branching 2–3(–4) cm; serrations of leaf blade margins blunt with serrations 0.3–0.4 mm wide at their base; stipules apically acute	P.philippinensis
–	Flowers 5-merous; inflorescences 1–4 cm with basal portion before first branching 0.1–1.0 cm; serrations of leaf blade margins blunt or sharp with serrations 0.2–0.3 mm wide at their base; stipules apically acuminate	5
5	Inflorescences 2–4 cm, sparsely reddish brown-tomentose, basal portion before first branching 0.5–1.0 cm; stipe ca. 1.5 mm; leaf blade serrations apically blunt; fruit when mature and fleshy 3–3.5 mm in diam.	P.alpestris
–	Inflorescences 1–2 cm, sparsely golden tan-tomentose, basal portion before first branching 0.1–0.2 cm; stipe 0.5–0.6 mm; leaf blade serrations apically sharply pointed; fruit when mature and fleshy ca. 5 mm in diam.	P.taronensis