Derris pubipetala Miq.

         Lianas. Bark slightly pinkish. Twigs 3–5 mm diam., sericeous or glabrescent. Leaves with 5–9 leaflets. Stipules triangular, 1.5–2 x 1.5–2 mm, outside sericeous, inside glabrous. Petiole 1.5–6 cm long, striate, hirsute or thinly hirsute; rachis 3.5–9 cm long, striate, (thinly) hirsute; pulvinus 5–10 mm long. Stipellae absent. Leaflets subcoriaceous; terminal one elliptic to obovate, 5.5–12.5 x 2.2–5 cm, length/width ratio ca. 2.5, base cuneate, obtuse to rounded, apex acuminate, acumen 2–13 mm long, rounded, upper surface glabrous to slightly hairy, lower surface strigose to almost glabrous, midrib slightly sunken above, veins slightly raised or flat above, raised below, 4–9 per side, 5–18 mm apart, not reaching the margin but curving towards the apex, sometimes anastomosing near the margin, venation usually reticulate but sometimes slightly scalariform; lateral ones mostly as terminal one, elliptic to ovate, 3.5–11 x 1.7–4.5 cm, length/width ratio 2.1–2.4; pulvinus 3–6 mm long. Inflorescences axillary or terminal, pseudoracemes/pseudopanicles, 5–28 cm long, peduncle 1.5–5 cm long, sericeous, branches up to 19 cm long. Bracts subtending brachyblasts ovate-triangular, 0.8–1.5 x 0.6–1.0 mm, outside sericeous, inside glabrous. Brachyblasts knob-like to slenderly cylindrical, 2–25 mm long with 5–7 flowers throughout, pubescent. Bracts subtending flowers elliptic to ovate or triangular, 0.6–0.7 x 0.3–0.5 mm, outside pubescent, inside glabrous. Pedicels 2–6 mm long, pubescent. Bracteoles at the base of the calyx, elliptic, 0.5–0.8 x 0.3–0.5 mm, outside pubescent, inside glabrous. Calyx cup-shaped, reddish brown to purplish, 3.5–4 mm high, outside sericeous, inside sericeous at the apex, tube ca. 3 mm high; upper lip with 2 short lobes, shallowly notched, 1–2 x 2–5 mm; lateral lobes semicircular to rounded triangular, 0.7–1 x 2–3 mm, lower lobe triangular, ca. 1 x 1.5–3 mm. Corolla white or pale green. Standard: claw 3–4 mm long; blade orbicular or ovate, 6–8 x 8–9 mm, apex emarginate, without auricle or basal callosities, outside sericeous except for the margin and base, mostly hairy in the middle and apical part, inside glabrous but sericeous at the apex. Wings: claw 3–3.5 mm long; blade elliptic to semi-hastate, 7–8.5 x 1.5–2.5 mm, apex rounded, upper auricle 1–2.5 mm long, lower auricle rarely present, 0.4–0.5 mm long, outside hairy at the apex, inside glabrous, lateral pocket inconspicuous. Keel petals: claw 2.3–2.5 mm long; blade boat-shaped, 6–6.5 x 2.3–2.5 mm, apex rounded, auricle 0.5–1 mm long, outside hairy at the apex, inside glabrous, lateral pocket 1.5–2.7 mm long, sometimes hardly visible. Stamens monadelphous, with basal fenestrae, 9–10 mm long, free part of filaments 2–3.5 mm long, glabrous; anthers 0.3–0.5 x 0.3–0.4 mm, glabrous. Disc annular, 0.1–0.3 mm high. Ovary hairy, 5–6.5 mm long, stipe hairy, ca. 1 mm long; ovules 3–5; style 5–8 mm long, glabrous but slightly hairy at base. Pods ellipsoid to almost circular, 3–6.5 x 1.8–3 cm, leathery with wing along both sutures, flat, upper wing wider than lower, 5–9 mm wide, lower wing 2–4 mm wide, pubescent, seed chamber hardly visible. Seeds 1 or 2 per pod, discoid or broadly bean-shaped, 7–8 x 5–6.5 x 1–2 mm; hilum central, 0.4–0.5 mm long.