Heteroblemma formanii (Regalado) Cámara-Leret, Ridd.- Num. & Veldk. 2013

Cámara-Leret, R., Ridder-Numan, J. W. A. & Veldkamp, J. F., 2013, Revision of Heteroblemma gen. nov. (Dissochaeteae - Melastomataceae) from Malesia and Vietnam, Blumea 58 (3), pp. 229-240 : 238

10. Heteroblemma formanii (Regalado) Cámara-Leret, Ridd.- Num. & Veldk. , comb. nov.

Medinilla formanii Regalado, Blumea 35 (1990) 56. — Type: Forman 521 (holo K; BO, L, SING).

Innovations hirsutulous. Branchlets striate, glabrous, c. 6 mm diam. Petioles terete, 5–9 cm by 2 mm, pilose. Leaves oblong to lanceolate, 13.5–23.5 by 4.5–9 cm, 2.1–3.6 times as long as wide, 1.7–4.3 times as long as the petioles, base attenuate, margin entire, ciliolate, apex acuminate, pergamentaceous (i.s.), underneath pilose (on primaries), 5–7-plinerved, basal acrodromous, first pair of nerves branching 5–10 mm away from the base, distalmost primaries 10–30 mm away from the preceding pair, submarginal vein conspicuous, secondary nerves conspicuous, c. 25 pairs, angle of divergence from midvein acute wide, tertiary nerves conspicuous. Bracts 1–1.5 mm. Flowers born in fascicles on old wood, pedicels 10– 20 mm long, glabrous or pilose. Mature floral buds 8–10 by 3–4 mm. Hypanthium urceolate to campanulate, 3.5 mm long, glabrous or pilose. Sepals 0.5 mm long, teeth absent. Petals 5–7 mm long, purple, outside papillose. Filaments 1.5–2(–3) mm long. Anthers 4 –5 mm long, lateral appendages not recurved, up to 0.5 mm, dorsal spur triangular to lanceolate, 1–1.5 mm long. Style 5–8 mm long. Fruit 5–7 by 5–6.5 mm, orange to red, smooth, glabrous, calyx teeth inconspicuous or absent; pedicels in fruit 15–30 mm, glabrous.

Distribution — Endemic of C Kalimantan (Upper Katingan River), E Kalimantan (C Kutei, Tabang, Belajang River; Balik- papan).

Habitat — Dryobalanops or Dipterocarpus mixed forest near river, primary swampy forest, on sandy yellow loam, 0–100 m altitude.

Collector’s notes — Epiphytic root climber, lianescent, up to c. 15 m high, upwards with lateral braches. Plant higher up with lateral branches. Leaves pale green on both sides, nerves brown. Flower (pale) purple. Petals white, pale dirty pinkish, pale pink lilac.Anthers yellowish, yellow. Fruit green white when young, turning mid-orange or red.

Notes — We are unsure of the collections Afriastini 15, Ambriansyah 604, Ambriansyah & Arbainsyah 1969, Mogea & De Wilde 4210 & 4250. They differ from H. formanii by the leaves with an acute base, glabrous underneath, and are (5–)7–9-plinerved.

7 collections were seen.