Heteroblemma cordatum Cámara-Leret, 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 : 237

6. Heteroblemma cordatum Cámara-Leret , sp. nov.

Innovationes hirsutullae,petioli glabri,folii lamina basi cordata infra hirsutulla 9-plinerva nervatione campylodroma nervis primariis a pare precedenti 5 mm distanti, pedicelli glabri, hypanthium 3 mm longum glabrum dentibus nullis vel minutis 0–0.2 mm longis glabris, antherae appendices laterales 0.2 mm longae, fructus glabri calycis reliquiae nullae vel inconspicuae pedicellis glabris. — Type: Burley, Tukirin et al. 3155 (holo L; A, BO) .

Innovations hirsutulous. Branchlets pustulate, glabrous, c. 10– 15 mm diam. Petioles terete, c. 16 cm by 3–4 mm wide, glabrous. Leaves 15.5 cm wide, base cordate, margin laxly serrulate, ciliolate, pergamentaceous, underneath hirsutulous along reticulations, 9-plinerved, campylodromous, first pair of primaries 0 – 5 mm away from base, distalmost primaries 5 mm away from the preceding pair, submarginal vein conspicuous, secondary nerves conspicuous, angle of divergence acute wide, tertiary nerves conspicuous. Bracts 2 mm long. Flowers born on dense fascicles on old wood, pedicels 10 mm long, glabrous. Mature floral buds 7–8 by 3.5 mm. Hypanthium urceolate to campanulate, 3 mm long, glabrous. Sepals 0.5–1 mm long, teeth absent or minute, 0–0.25 mm long, glabrous. Petals 6–7 mm long, white, outside papillose. Filaments 2 mm long. Anthers 5 mm long, lateral appendages not recurved, 0.25 mm long, dorsal spur triangular to lanceolate. Style 6 mm long. Fruit 6 by 5 mm, smooth, glabrous, calyx teeth inconspicuous or absent; pedicels in fruit 15– 35 mm long, glabrous; seeds less than 0.5 mm, yellow (i.s.).

Distribution — Endemic of W Kalimantan: NE of Pontianak, G. Bentuang area.

Habitat — Mixed dipterocarp forest on sandstone ridge, occasional, 400 m altitude.

Collector’s notes — Climber, 25 m tall. Petals white.

Notes — Although similar to H. serpens by its cordate leaf base and the 9 primary nerves, it is different in its glabrous flower and fruit pedicels and hypanthium, while its calyx teeth are minute or absent and glabrous. It differs from H. alternifolium in its cordate leaf base and campylodromous venation and abaxially it is hirsutulous along the reticulations below.

Only known from the type.