Tree 10-15 m. Leaves chartaceous, oblong to lanceolate, 8-14 by 2.5-3.5 cm, base rounded or short-attenuate, apex longly acute(-acuminate); Inflorescences: Fruits 1 or 2 per infructescence (± immature), ellipsoid, 1.5-2 cm long, with dense ferruginous hairs 0.5(-l) mm long;
Asia-Tropical: Philippines (Philippines present), Luzon present, Prov. of Nueva Ecija & Zambales present
Malesia: Philippines (Luzon: Prov. of Nueva Ecija & Zambales).
Knema alvarezii is known from only a few collections. It seems related to the East Malesian K. tomentella, in which it was included by Sinclair (). The latter species differs in its earlier glabrescent lower leaf surface, the somewhat smaller male flowers with 8-11 anthers, and the subapical bracteole.