Mucuna eurylamellata Adema, 2016

Wiriadinata, H., Ohashi, H. & Adema, F., 2016, Notes on Malesian Fabaceae (Leguminosae-Papilionoideae) 16. The genus Mucuna, Blumea 61 (2), pp. 90-124 : 107-108

15. Mucuna eurylamellata Adema , sp. nov. — Fig. 3

Twigs tomentose. Petioles 23–45 mm long, tomentose, rachis 10–18 mm long, tomentose. Longest hairs on twigs 1.0–2.0 mm long, on petiole and rachis 2.5 mm long. Pods c. 9.5 by 2.5 cm,upper wing 15–20 mm wide,lower wing 14–17 mm wide, lamellae oblique c. 22 mm high. Seeds ± globular, 18–20 by 19–20 by 14.4 mm. — Type: LAE 60525 (Croft & Lelean) (holo L; iso K), Papua New Guinea, Central Prov., Port Moresby subprov., SW slope Lake Myola No. 1, 1900 m .

Liana up to 3.5 m. Twigs terete, 2–3 mm diam, tomentose (see Note). Stipules ovate, c. 7 by 3 mm, outside sericeous, inside glabrous, caducous. Petioles 23–45 mm long, ± terete, tomentose (see Note); rachis mostly as the petiole, 10–18 mm long; pulvinus 4–8 mm long. Stipellae acicular, 6–8 by 0.3–0.4 mm, ± sericeous. Leaflets: terminal broadly elliptic, obovate or ± orbicular, 6–10 by 4.5–6.5 cm, index 1.2–1.4, base rounded, apex acuminate, acumen 3–6 mm long, above with scattered appressed hairs, midrib and nerves sericeous, below velutinous, midrib and nerves sericeous, sometimes with some very long hairs, midrib raised above, nerves flat or raised above, 3–5 per side, 9–25 mm apart, anastomosing close to the margin; lateral mostly as the terminal, obliquely ovate, 4.5–8.0 by 3.0–5.0 cm, index 1.5–1.7; pulvinus 4–5 mm long. Inflorescences axillary, pseudoracemes, 2–12 cm long, peduncle 0.5–2.5 cm long, tomentose. Brachyblasts in fruit c. 15 mm long. Bracts to the flowers ovate, c. 16 by 8 mm, outside sericeous and with some irritating hairs, inside with some hairs at the base. Pedicel in fruit c. 23 mm long. Bracteoles narrowly ovate, c. 14 by 5 mm, outside sericeous, inside glabrous. Corolla greenish white. Pods flattened ellipsoid, c. 9.5 by 2.5 cm, stipe 5 mm long, upper wing 15–20 mm wide, lower wing 14–17 mm wide, lamellae oblique, c. 22 mm high, valves puberulous and with many irritating hairs. Seeds ± globular, 18–20 by 19–20 by 14.4 mm; hilum 46–49 mm long, c. 4/5 of the circumference.

Distribution — Malesia: Papua New Guinea: Central Prov.

Habitat & Ecology — Secondary growth, edge of forest and grassland. Altitude 560–2100 m. Flowering: January, June; fruiting: October.

Specimens seen. PAPUA NEW GUINEA, Central prov., Uniri river , c. 1500 ft, Carr 15251, 26 Jan. 1930 ; Central Prov., Port Moresby Subprov., SW slope Lake Myola No. 1, 1900 m, LAE 60525 (Croft & Lelean), 1 Oct.1973 ; Central Prov., Myola , near airstrip, 1080 m, Hopkins & Hopkins 1017, 19 May 1989 .

Note — Longest hairs on twigs 1.0–2.0 mm long, on petiole and rachis 2.5 mm long.

Figures

Fig. 3 Mucuna eurylamellata Adema. a. Twig; b. pod from outside; c. pod from inside; d. seed, lateral view; e. seed, top view (all: LAE 60525 (Croft & Lelean)). — Drawing Esmée Winkel.