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14. Calyx lobes relatively broad and broad-acute at apex, lowest 6–10 by ca 5 mm; all bracts broadly ovate (22–)30–40 mm long with apex short-acuminate or acute but not hooded; flowers always


9. M. interrupta

14. Calyx lobes relatively narrow and long-acuminate, lowest 8–10 by 2–3 mm; upper (flower- subtending) bracts elliptic or obovate 10–20 mm long with apex broadly rounded and often

hooded; flowers usually dark purple

7. M. hainanensis

1. Lateral veins straight or uniformly curved throughout their length and clearly running into margin; terminal leaflet often rhombic or rhombic-ovate; wing petals with broadly rounded apex, not tapering

  • (B.

    Subgenus Stizolobium)

    • 15.

      Flowers long, wings 6–6.3 by 1.5 cm, keel ± equalling wings

10. M. gracilipes

  • 15.

    Flowers short, wings 2.5–3.5 by 0.6–0.8 cm; keel usually distinctly longer than wings, up to 4(4.5) cm long

    • 16.

      Inflorescence axis with many bracts throughout length including lower, (flowerless) part, bracts 8–24 mm long but always some considerably over 8 mm, persistent to mature flowering and often to fruiting stage; leaflets beneath with veins usually conspicuously

darker and less pubescent than surface

12. M. bracteata

16. Inflorescence axis without bracts or scars in lower, flowerless, part; bracts up to 8(–10) mm long, caducous; leaflets beneath with surface no more densely pubescent nor paler than veins

17. Bracts and bracteoles usually fairly broad and never acuminate; pubescence on stem, leaflets and inflorescence axis rather orange-brown giving distinct yellowish-orange

tinge, especially to leaflet veins beneath

11b. M. puriens var. hirsuta

  • 17.

    Bracts and bracteoles narrow, long-acuminate; pubescence on all parts of plant, where present, silvery (scattered irritant orange bristles often also present)

    • 18.

      Irritant orange bristles, at least a few, usually present on stems, inflorescence axis or calyx

18. Irritant orange bristles always absent.

11a. M. puriens var. puriens 11c. M. puriens var. utilis

B. Fruiting material (excluding M. gracilipes for which no fruit is known)

  • 1.

    Fruits markedly laterally flattened, either woody, linear-oblong and > 25 cm long or leathery with pair of wings along each margin and broadly oblong at least 3.5 cm wide, or if only 2.5 cm wide then length 3 times width; seeds discoid to flattened-oblong with elongated hilum occupying over ½ circumference and no aril; leaflets with lateral veins gently curved but near margin more sharply curved and (in Thailand) never clearly running into margin but always becoming indistinct or running ± parallel to margin; (A. Subgenus Mucuna)

    • 2.

      Stems and leaves with conspicuous dark red brown indumentum.

    • 3.

      Leaflets without stipels, abaxial half of lateral leaflets truncate at base; fruits woody, linear-

oblong at least 26 cm long without marginal wings or surface lamellae

1. M. macrocarpa

  • 3.

    Leaflets with persistent stipels, lateral leaflets rounded at base; fruits leathery, broadly oblong, to 10 cm long with marginal wings and surface lamellae.

    • 4.

      Fruit with only a few, scattered, partly developed lamellae arising erratically on face, extending transversely (never obliquely) across at most of face, 1–10 mm long and to 3 mm high in places or merely slight protuberances; lowest calyx lobe 6–8 mm long; leaflets

indistinctly short-acuminate (Peninsular)

4. M. oligoplax

4. Fruit with 5–6 well-developed lamellae running obliquely across face, converging and interrupted towards centre of pod; lowest calyx lobe to 4.5 mm long; leaflets abruptly short-

acuminate (Northern). 2. Stems and leaves glabrous or with pale indumentum

5. M. monosperma

  • 5.

    Fruits large, woody, linear-oblong but often swollen around seeds, length at least 8 times width, 23–45 by 3–5 cm; (margins winged or not)

    • 6.

      Surface of fruit ornamented with very low transverse lamellae; margins narrowly winged


M. warburgii

6. Surface of fruit shallowly ridged but otherwise unornamented; margins not winged

7. Calyx very large, lowest lobe 10–13 mm long, laterals 5–8 mm; fruit at least 45 cm long;

leaves always glabrous, terminal leaflet relatively wide, length/width ratio of terminal leaflet

and ratio of abaxial to adaxial halves of lateral leaflets 1.5–1.75.:1

2. M. thailandica

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