Tuberolabium Yamam.,
Bot. Mag. (Tokyo) 38 (1924) 209
Monopodial epiphytes. Stem short to elongated. Leaves few to several, distichous, sheathing at the base, glabrous, deciduous, duplicate, leathery. Inflorescence lateral, a many-flowered raceme. Flowers either appearing in successive clusters or simultaneously along the whole inflorescence, rather small, ephemeral or not, resupinate. Sepals free. Petals free, somewhat narrower than the sepals. Lip with or without spur, more or less sac-shaped, without callosities, not mobile. Column-foot present or absent. Pollinia 2, entire or with a short slit, solid, caudicles present or absent, stipe present, short, viscidium present.
Distribution
Taiwan, Southeast Asia, Malaysia, Indonesia, the Philippines, Papua New Guinea, Australia; about 10 species.
Distribution in the Philippines
Luzon (Benguet, Nueva Vizcaya, Nueva Ecija, Zambales, Bataan, Rizal, Laguna, Quezon); 6 species.
Habitat
Epiphytes in lowland forest.
Notes
Members of this genus of small-flowered monopodials are often called Saccolabium, but as currently understood true species of Saccolabium are restricted to Indonesia (Java and Sumatra). Tuberolabium is characterised by the very fleshy, sac-shaped, immobile lip, without callosities or other ornaments inside, and by having two pollinia. It is rather frequently seen in amateur collections.