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4. Pedicels (2–)2.5–3.5 cm long; pubescence on inflorescence golden-brown, flowers ca 5 cm long with light greenish-purple wings, pale brownish purple standard and pale purple keel; lowest calyx lobe long and narrow 6–8 mm long but only up to 1.5 mm wide except at

extreme base (Peninsular region)

4. M. oligoplax

      • 4.

        Pedicels only to 1 cm long; pubescence on inflorescence deep red-brown; flowers to 4.4 cm long, all petals dark purple; lowest calyx lobe up to 4.5 mm and often 4 mm wide (Northern).

        • 6.

          M. monosperma

  • 2.

    Stems and leaves glabrous or with pale indumentum

    • 5.

      Standard and wings in apical part with short but distinct pubescence around the margin; wings and keel purple, standard pink or whitish; leaflets without persistent stipels, abaxial half of

lateral leaflets truncate at base

1. M. macrocarpa

  • 5.

    Standard and wings glabrous in apical part, pubescent only in basal (claw) region, colour various; stipels present or not, lateral leaflets various

    • 6.

      Corolla bright fiery red-orange, very long (6–8 cm) with wings and keel uniformly curved throughout their length to give distinct scimitar-shape to flower (cultivated) M. warburgii

    • 6.

      Corolla purple or greenish white, usually shorter and never scimitar-shaped, wing ± straight, keel straight with abruptly upcurved apex

      • 7.

        Flowers very large, standard 4.5–5.5 cm, wings 7–7.5 cm long, keel 7.5–8.5 cm long; corolla

greenish white; stipels absent

2. M. thailandica

  • 7.

    Flowers smaller, standard to 3.5(–3.8) cm, wings and keel to 6(–6.3) cm long, colour various; stipels present

    • 8.

      Inflorescence axis with pedicels (often also ultimate branchlets) of very varying lengths and progressively shorter towards axis apex so as to form a pseudumbel; indumentum of stem, leaves and inflorescence axis absent or fine, pale and adpressed, flowers greenish-white, small 3–4.5 cm long

9. Inflorescence usually at least 8 cm, often up to 25 cm long, consisting of a single main axis

with ultimate (flower-bearing) branchlets all crowded near its apex and remainder of axis devoid of bracts or scars, sparsely pubescent; standard relatively large, [ keel length, wings and keel 2.8–4 cm long; calyx lobes very short and relatively broad, lowest lobe 1–

3 mm, laterals 1–2 mm long

3. M. gigantea

9. Inflorescence either very short, 2.5–3 cm long consisting of a single main axis or rarely

(Java)– 6 cm long and with main axis branched near base, ultimate branchlets throughout most of length of main axes, axes densely pubescent; standard shorter relative to other petals, ± S keel length, keel ± 4.5 cm long, wings often shorter than keel; calyx lobes much longer and relatively narrower, lowest 6–9 mm, laterals 3–6 mm long (Peninsular


M. acuminata

8. Inflorescence not pseudumbellate, pedicels of ± uniform length, ultimate branchlets all of uniform length or all completely reduced and knob-like; flowers and indumentum various

10. Calyx lobes small, lowest caducous; flowers purple

4.5 mm long, laterals

2 mm long; bracts small and

11. Lowest calyx lobe 1.5–4 mm long, laterals often < 0.5 mm (Peninsular Malaysia)

11. Lowest calyx lobe ca 4.5 mm long, laterals ca 2 mm

  • M.


    • 5.

      M. monosperma

    • 10.

      Calyx lobes larger, lowest at least 6 mm long and laterals at least 4 mm (bracts and flowers various)

  • 12.

    Ultimate branchlets of inflorescence lengthened ± 3 mm long; pedicels very long, (1.5–)2 cm;

flowers purple, small, 4.5 cm long; bracts caducous

6. M. stenoplax

  • 12.

    Ultimate branchlets of inflorescence reduced, knob-like, pedicels to 1 cm long (flowers and bracts various)

    • 13.

      Fine hairs on inflorescence axis and calyx very short, 0.1–0.2 mm long, spreading and almost velvety, only coarse bristles (where present) adpressed; flowers usually pink or purple (rarely white), 4.5–4.8 cm long; bracts small, 5–17 by (2–)5–7 mm, moderately caducous

      • 8.

        M. revoluta

    • 13.

      Fine hairs, at least most on inflorescence axis and calyx 0.4 mm long, not velvety, both hairs and bristles usually adpressed; flowers (purple or white) usually 5–6 cm long; at least the lower bracts often persistent, large and broad, 20–40 by 10–20 mm

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