Ormocarpum vanuatuense Arbainsyah, 2024

Adema, F., 2024, The genus Ormocarpum (Fabaceae - Papilionoideae) in Malesia and the Pacific, Blumea 69, pp. 27-35 : 34

8. Ormocarpum vanuatuense Arbainsyah , sp. nov. — Fig. 2d, e

Petioles,rachises and pedicels thinly sericeous.Calyx 10–16 mm long. Stan- dard:blade 11.7–12 by 12–13 mm. Ovary with bulbous-based hairs. — Type: Berry 27 (holo L!; iso K!), Vanuatu, Santo, Fortsenale.

Treelets, c. 6 m tall. Twigs terete, c. 4 mm diam, lenticelled, gla- brous. Stipules caducous, narrowly triangular, c. 3 by 1.2 mm, outside glabrous, inside short hairy. Leaves with 9–15 leaflets. Petiole c. 4 mm long, thinly sericeous, without bulbous-based hairs; rachis c. 12 mm long, thinly sericeous, without bulbous-based hairs; pulvinus c. 1 mm long. Leaflets: terminal one obovate, c. 7.5 by 3.5 mm, c. 2.1 times as long as wide, base acute, apex rounded, apiculate, upper surface glabrous, lower surface glabrous, midrib and nerves ± sunken above, nerves 4 or 5 per side, c. 0.9 mm apart, venation slightly darker than the rest of the surface; lateral leaflets mostly as the terminal one,elliptic, c. 5 by 3 mm, c. 1.6 times as long as wide; pulvinus c. 0.6 mm long. Bracts to the flowers broadly ovate to semicircular, c. 1.3 by 0.7 mm, outside glabrous, inside the base with short hairs. Pedicels c. 10 mm long, thinly sericeous, without bulbous-based hairs. Bracteoles ovate, 1.3–2 by 1.1–1.5 mm, both sides glabrous, margin ciliate, inside with some colleters at the base. Calyx light yellow, 10–16 mm long, tube 8–10 mm long, teeth of upper lip triangular, 1.7–2 by 2.2–2.5 mm; lateral teeth triangular, c. 4 by 3.7–4 mm, median tooth trian- gular, 5.1–6 by 4–5 mm; both sides glabrous. Standard: claw 2.7–3 mm long; blade orbicular, 11.7–12 by 12–13 mm, apex emarginate, 2 basal callosities, both sides glabrous, auricles absent. Wings: claw 3 – 4 mm long; blade broadly obovate, 11–13 by 8.5–9 mm, apex rounded, not or faintly sculptured outside, both sides glabrous. Keel petals: claw 4–4.5 mm long; blade ‘boat-shaped’, 11.3–13 by 8.2–9 mm, auricles c. 0.2 mm long, both sides glabrous. Stamens diadelphous (9 + 1), tube 9–11 mm long, free part 5–8 mm long, glabrous; anthers equal, 1.1–1.6 by 0.5–0.8 mm, glabrous. Disc c. 1 mm long, glabrous. Ovary c. 7.5 mm long, hirsute-sericeous with bulbous-based hairs; stipe c. 4 mm long, glabrous; ovules 3; style c. 10 mm long, glabrous. Pods and seeds unknown.

Distribution — Vanuatu (one specimen).

Habitat & Ecology — Near a house. Altitude: c. 619 m. Flowering: December.

Note — Berry 27 is variable in the ornamentation of the wing petals: some flowers have non-sculptured wing petals, while others have faintly sculptured wing petals.

Figures

Fig. 2 Details of flowers and fruits of Ormocarpum species.a–c. O. sennoides (Willd.) DC. subsp. sennoides. a. Wing;b. ovary: c. fruit. — d, e. O. vanuatense Arbainsyah. d. Stamens, 9 + 1; e. ovary. — f–j. O. smitsii Arbainsyah.f. Leaflet;g. wing; h. stamens, 9 + 1; i. ovary; j. fruit. — k–n. O. philippinense Arbainsyah. k. Wing; l. stamens, 2 bundles of 5, not fully split; m. fruit; n. ovary (a, b: Jacobs 4896; c. Schmutz 2190; d, e: Berry 27; f–j: Jaag 922; k, m, n: Cuming 1849; l: Clemens 17870; all L).). — Drawing by Anita Walsmit Sachs.