Dalbergia minutiflora Sunarno & H.Ohashi, 2016

Adema, F., Ohashi, H. & Sunarno, B., 2016, Notes on Malesian Fabaceae (Leguminosae-Papilionoideae) 17. The genus Dalbergia, Blumea 61 (3), pp. 186-206 : 196

20. Dalbergia minutiflora Sunarno & H.Ohashi , sp. nov. — Fig. 4

Similar to D. rostrata , but with much smaller flowers.Standard:claw 1.1–2.0 mm long;blade 2–2.5 by 2 mm.Wings:claw 1.4–2.0 mm long;blade 2.0–2.2 by 1.0–1.5 mm.Keel petals:claw 1.7–2.0 mm long;blade 2.0–2.9 by 1.0–1.5 mm. — Type: Sunarno 621 (holo BO; iso TUS), Irian Jaya, Upwapa district, Topo area , Nabire , Feb. 1986 .

Dalbergia simplicifolia auct. non Merr.: Kaneh. & Hatus. (1942) 364; Verdc. (1979) 297.

Dalbergia rostrata auct. non Hassk.: Verdc. (1979) 297.

Woody climber up to 25 m high. Twigs c. 3 cm diam, sparsely white pubescent, glabrescent. Stipules falcate, c. 1 by 1 mm, outside sericeous, inside glabrous, very early caducous. Leaves with 1–5 leaflets. Petiole 1–3 cm long, terete, striate, thinly sericeous; rachis mostly as the petiole, up to 7 cm long; pulvinus 2–4 mm long. Leaflets: terminal elliptic to ovate, 6–15.5 by 3–7 cm, index 1.7–2.2, base cuneate to slightly cordate or truncate, apex acuminate, acumen 5–20 mm long, above glabrous, below thinly sericeous, glabrescent, midrib slightly sunken or flat above, nerves flat above, 5–13 per side, 1–20 mm apart; lateral mostly as the terminal, 3–8 by 2–4.5 cm, index 1.6–1.9, base equal-sided; pulvinus 3–5 mm long. Inflorescences axillary or terminal, racemes or panicles, 1–6 cm long, peduncle up to 5 mm long, sericeous, branches 3–30 mm long. Bracts to the flowers broadly ovate, 1.1–2 by 0.3–1.5 mm, outside sericeous, inside glabrous, caducous. Pedicels 1–3 mm long, pubescent. Bracteoles narrowly ovate to linear or acicular, 0.3–1 by 0.1 mm, outside sericeous, inside glabrous. Calyx bell-shaped, 2.3– 3 mm long, tube 1.7– 2 mm long; teeth of upper lip triangular, 0.4–0.5 by 0.8–1.2 mm, lateral teeth triangular, 0.7 by 0.6–0.8 mm, median tooth triangular, 0.8 by 0.7 mm; outside sericeous, inside glabrous. Corolla white. Standard: claw 1.1– 2 mm long; blade broadly elliptic, 2–2.5 by 2 mm, rounded to emarginate, both sides glabrous. Wings: claw 1.4– 2 mm long; blade elliptic, 2–2.2 by 1–1.5 mm, rounded, both side glabrous, outside sculpted. Keel petals: claw 1.7–2.0 mm long; blade boat-shaped, 2–2.9 by 1–1.5 mm, rounded, both sides glabrous. Stamens 9–10, monadelphous, open sheath, tube 2.5– 3 mm long, free part of filaments 1.0–1.5 mm long, glabrous; anthers 0.2 by 0.2 mm, glabrous. Ovary 1–1.5 mm long, sericeous, stipe 1–1.5 mm long, sericeous in upper part; ovules 1 or 2; style c. 1.5 mm long, glabrous.

Distribution — Malesia: New Guinea: Irian Jaya.

Habitat & Ecology — Lowland and lower mountain forest, usually primary forest, fringe vegetation, river banks. Soil: loam. Flowering: February, April, July, September.

Note — Older branches have leaves with 3 or 5 leaflets, most flowering twigs have unifoliolate leaves. Leaflets often dry blackish or brown. Up to now only known from flowering specimens. Rather similar to D. rostrata , especially different in sizes of flowers and flower parts.

Figures

Fig. 4 Dalbergia minutiflora Sunarno & H.Ohashi. a. Habit; b. flower; c. opened calyx; d. corolla parts (top to bottom: standard, wings, keel); e. stamens; f. pistil (all: Sunarno 621). — Drawing by Bambang Sunarno.