| 1 |
Petals outside glabrous (but not always explicitly stated in description; corolla unknown in M. entadoides) |
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(2) |
| + |
Petals outside pubescent |
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(8) |
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| 2 (1) |
Leaf rachis and leaflet blades glabrous |
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(3) |
| + |
Leaf rachis and leaflet blades at least abaxially with trichomes |
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(5) |
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| 3 (2) |
Leaflets subalternate, blades obliquely ovate, base asymmetric; legume stipitate. |
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1 M. ichthyochtona |
| + |
Leaflets opposite, blades oblong-lanceolate, oblanceolate, or oblong, base symmetric; legume sessile |
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(4) |
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| 4 (3) |
Leaflet blades 12-25 cm, secondary veins 11-13 on each side of midvein; seeds thickly lenticular; trees. |
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3 M. leptobotrya |
| + |
Leaflet blades 9-12 cm, secondary veins 9-12 on each side of midvein; seeds reniform; lianas. |
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13 M. entadoides |
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| 5 (2) |
Leaflets 13-17, blades abaxially brown sericeous; legume inflated, rough with dense warts; lianas. |
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12 M. pachycarpa |
| + |
Leaflets 7-11(or 13), blades abaxially yellow tomentose, scarlet strigose on midvein and margins, or pilose on midvein; legume flat, without warts; trees |
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(6) |
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| 6 (5) |
Leaflet blades abaxially yellow tomentose; legume sutures both with 2 ca. 1 cm wide woody wings. |
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2 M. tetraptera |
| + |
Leaflet blades abaxially scarlet strigose on midvein and margins or pilose on midvein; legume sutures both only thickened |
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(7) |
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| 7 (6) |
Leaflet blades abaxially scarlet strigose on midvein and margins; pseudoracemes erect. |
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4 M. erythrocalyx |
| + |
Leaflet blades abaxially pilose on midvein; pseudoracemes pendulous. |
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5 M. leucantha |
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| 8 (1) |
Stipels absent |
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(9) |
| + |
Stipels present |
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(11) |
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| 9 (8) |
Leaflet blades broadly elliptic, membranous, both surfaces pubescent, apex acute; legume flat. |
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6 M. pubinervis |
| + |
Leaflet blades oblong-elliptic to lanceolate-elliptic or lanceolate to oblong-lanceolate, glabrous or sparsely pilose adaxially, apex caudate; legume inflated |
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(10) |
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| 10 (9) |
Leaflet blades oblong-elliptic to lanceolate-elliptic, papery, abaxially brown tomentose, adaxially shiny and sparsely pilose. |
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11 M. sapindifolia |
| + |
Leaflet blades lanceolate to oblong-lanceolate, subleathery, abaxially sparsely strigose and adaxially glabrous. |
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7 M. austroyunnanensis |
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| 11 (8) |
Leaflets 13-19 |
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(12) |
| + |
Leaflets (5 or)7-13(or 15) |
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(14) |
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| 12 (11) |
Stipules ca. 8 mm, persistent; branchlets reddish brown tomentose. |
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8 M. cubittii |
| + |
Stipules 1-3 mm, caducous; branchlets yellow tomentose or grayish yellow pubescent |
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(13) |
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| 13 (12) |
Pseudoracemes 20-25 cm; flowers 1.3-1.6 cm; corolla white or lilac; legume tomentose; trees 8-15 m tall. |
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16 M. velutina |
| + |
Pseudoracemes 6-15 cm; flowers 0.9-1.2 cm; corolla pale red to scarlet; legume gray pubescent but glabrescent; erect shrubs or trees 3-8 m tall. |
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17 M. pulchra |
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| 14 (11) |
Leaf rachis 15-20 cm; leaflet blades 4-5.5 cm. |
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18 M. oraria |
| + |
Leaf rachis 25-40 cm; leaflet blades 7-18 cm |
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(15) |
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| 15 (14) |
Leaflets 5; stems slender, without lenticels. |
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9 M. lantsangensis |
| + |
Leaflets 7-13; stems thick, with scattered lenticels |
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(16) |
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| 16 (15) |
Leaflet blade secondary veins 13-17 on each side of midvein; lianas. |
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10 M. pachyloba |
| + |
Leaflet blade secondary veins 7-10 on each side of midvein; trees or erect shrubs |
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(17) |
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| 17 (16) |
Leaflet blades abaxially glabrescent; inflorescences longer than subtending leaf; flowers ca. 1.8 cm; trees. |
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14 M. macrostachya |
| + |
Leaflet blades abaxially densely brown pubescent especially on veins; inflorescences shorter than subtending leaf; flowers ca. 1 cm; erect shrubs. |
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15 M. griffithii |
