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| 1 |
Leaflets orbicular (but see also I. aromatica). |
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1 I. orbiculata |
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Leaflets not orbicular |
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(2) |
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| 2 (1) |
Bases of leaflets cordate or subcordate |
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(3) |
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Bases of leaflets rounded or cuneate |
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(6) |
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| 3 (2) |
Flowers yellow or reddish yellow |
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(4) |
| + |
Flowers red or white with red |
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(5) |
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| 4 (3) |
Leaflets abaxially pilose; outer tepals abaxially glabrous, adaxially villous; stamen appendages clavate and solid; ovary densely pubescent. |
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2 I. cordata |
| + |
Leaflets abaxially glabrous; outer tepals abaxially pellucid-glandular, puberulent; stamen appendages membranous, with open mouth; ovary glabrous. |
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3 I. nervosa |
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| 5 (3) |
Inflorescence rather compact, densely yellow-brown villous; outer tepals 12-14 mm; style hirsute; leaflets adaxially sparsely hispid but yellow-brown strigose on veins, abaxially glabrous or slightly villous, intercostal venation slightly scalariform. |
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4 I. grandiflora |
| + |
Inflorescence rather lax, densely golden yellow tomentose; outer tepals 8-10 mm; style tomentose; leaflets adaxially golden yellow pubescent, abaxially golden brown tomentose on veins or at vein base only, intercostal venation conspicuously scalariform. |
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5 I. rhodantha |
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| 6 (2) |
Leaflets papery |
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(7) |
| + |
Leaflets subleathery, leathery, or thickly leathery |
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(10) |
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| 7 (6) |
Both surfaces of leaflets ± pubescent especially on veins, adaxially blackish when dry; flower buds ovoid or ellipsoid. |
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6 I. luzonensis |
| + |
Leaflets adaxially glabrous or pubescent on veins, not blackish when dry; flower buds globose |
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(8) |
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| 8 (7) |
Inflorescence glabrous, ca. 5 cm; outer tepals pellucid-glandular; filaments straight in bud; staminal appendages nearly inconspicuous. |
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7 I. glabra |
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Inflorescence pubescent, 10-20 cm; outer tepals not pellucid-glandular; filaments curved around anthers in bud; staminal appendages present |
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(9) |
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| 9 (8) |
Leaflets adaxially not nitid; tepals ca. 5 mm; stamens less than 2 × as long as tepals, filaments ca. 0.5 mm wide at base. |
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8 I. parviflora |
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Leaflets adaxially nitid; tepals 5-7 mm; stamens more than 2 × as long as tepals, filaments 1.5-2.5 mm wide at base. |
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9 I. celebica |
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| 10 (6) |
Both surfaces of leaflets glabrous |
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(11) |
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Both surfaces of leaflets not glabrous |
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(12) |
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| 11 (10) |
Fruit wing up to 6 cm wide. |
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10 I. henryi |
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Fruit wing 4-4.5 cm wide. |
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11 I. trifoliata |
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| 12 (10) |
Leaflets acuminate at apex, adaxially pilose on midvein, abaxially glabrous; stamen appendages ca. 3.5 mm, abaxially with open mouth; ovary glabrous. |
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12 I. khasiana |
| + |
Leaflets acute to caudate-acuminate at apex, abaxially barbate or villous at axils of veins; stamen appendages ca. 2.5 mm, abaxially with open mouth (navicular) or small and solid; ovary densely pubescent |
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(13) |
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| 13 (12) |
Leaflets suborbicular, 5-11.5 × 4-9.5 cm, abaxially barbate at axils of veins; stamen appendages navicular, ca. 2.5 mm. |
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13 I. aromatica |
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Leaflets lanceolate to broadly lanceolate, narrowly elliptic, or narrowly ovate to broadly lanceolate, abaxially villous at axils of veins; stamen appendages small and solid |
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(14) |
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| 14 (13) |
Leaflets lanceolate to broadly lanceolate, 6-8 × 2-2.5 cm, thickly papery, base cuneate to broadly cuneate; stamens 4.5-5 mm; style 3-4 mm. |
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14 I. pseudoparviflora |
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Leaflets narrowly elliptic or narrowly ovate to broadly lanceolate, 6-9 × 3-4 cm, subleathery, base rounded; stamens ca. 2 mm; style ca. 1 mm. |
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15 I. brevistaminata |
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